B is for Big Bang | Projects for Little Hands

We had so much fun working on the B is for Big Bang unit! Here are some of the fun projects referenced in the thematic unit for you to try at home!

Also, totally by coincidence, I realized the B alliteration continues with these activities – bottle, balloon, bin, and bread (sorry, atom)!

Please note that some of the links included in my unit plans are affiliate links. That means that if you follow the link and purchase something, I earn a small commission for my recommendation. This support helps keep my resources free and is much appreciated!


Universe in a Bottle

Preparing For This Activity

What You’ll Need:

  • A water bottle or other clear container that can be sealed
  • Water
  • Glitter glue
  • Loose glitter
  • Goo Gone (to remove any sticky residue on your container, optional)
  • Any other metallic objects you may want to add (optional)
  • Food coloring (optional)
  • Cotton balls (optional)
  • Mixing bowl and funnel (optional)

Before You Start:

Gather your materials and make sure you have everything ready to go. Remove any labels and remove residue with Goo Gone before you get going!

Making Your Universe

This is a really simple construction project. Simply fill the bottle with hot water and dissolve glitter glue to make a sparkly solution. Add loose glitter, food coloring, or other materials as you see fit, to make your universe work for you!  You can also opt to tear apart some cotton balls to make “gaseous clouds” in your universe.

I have found that it’s easier to mix the ingredients (except the cotton balls, if you opt to use them) outside of the bottle. However, a glittery gluey spill is not fun, so if you mix in a bowl, plan to use a funnel to get the mixture inside the bottle.

Activities With Your Universe

First and foremost, this is just fun to play with. You can let your little scientist just explore it and call this activity done.

Or you can go one step further and use it as a Big Bang demonstration. Let all of the glitter and contents settle to the bottom to represent singularity. Then begin to shake it vigorously, representing the time immediately following the Big Bang when the universe was expanding and full of energy. Then, let it rest. The objects/glitter will slow down, representing more of the current universe.


Big Bang Balloon Lab

Preparing For This Activity

What You’ll Need:

  • A balloon
  • A marker
  • A piece of string

Before You Start:

The set up for this activity is quick and easy. Simply inflate your balloon slightly. Use a marker to make a few dots or swirls around the balloon. Then, let the air out. You’re ready to begin!

Demonstrating the Big Bang

Explain that the balloon represents the universe. Before you begin blowing it up, the balloon represents singularity. All of the “stuff” is still there on the balloon, the balloon is the same mass, but it doesn’t take up as much space.

Then, slowly start to inflate the balloon. Ask your little scientists what they notice. The balloon itself still has the same mass and nothing has been added, but it’s starting to look very different.

Inflate it slightly more. Again, same mass, but it’s now getting bigger. The dots or swirls that represent the galaxies are further apart. They might even look like a slightly different shape. At this point, you might want to use a piece of string to measure the distance of the “galaxies” with your little scientist, so they can see the size increasing concretely.

Continue inflating the balloon as much as you want to make the point and continue the fun!

 


Universe Sensory Bin

Making Your Sensory Bin

I’m going to be honest, there are a million ways to make these sensory bins. If you head to Pinterest and search for sensory bins, you’ll find lots and lots of options. So, instead of telling you how to make the exact same bin that we made, I’m going to give you some suggestions to mix and match for your own perfect sensory bin.

As you browse my suggestions, keep your own little scientist’s exploration methods in mind, especially if they like to explore with their mouths. Some of these materials can be choking hazards, so always use your parental discretion and supervise this activity!

Open Space

You’ll want something dark as your base for wide open space. Black beans, coffee beans, coffee grounds, or black aquarium gravel can all be good options for this. You could even mix multiple ingredients together.

Stars & Planets

You can use glitter, small and large beads, small star confetti, marbles, small balls, cut-out clip-art, or even cut up yellow paper to represent these celestial bodies!

 Galaxies

If you want to mimic some galaxies and floating clouds of dust/gas, you could dip some shredded cotton ball bits into paint/glitter and add them to the sensory bin for even more textures!

Rockets & Satellites

There are a bunch of different options here, with the most basic being printing out pictures from the internet. For a bit more extended play, you could also consider a play set like this 15-piece Mission to Mars Space Shuttle Play Set or even a building set like this Lego City Space Starter Set that will provide a whole second activity to build!

Extension Activities

If you’re looking for some extra letter practice, check out this activity with glow stars and letters!


Cosmic Inflation Bread Project

Preparing For This Activity

What You’ll Need:

  • 2 cups warm water
  • 6 cups of flour
  • 1/3 cups of white sugar
  • 1.5 teaspoons of salt
  • 1.5 tablespoons of yeast
  • 1/4 cup of vegetable oil
  • 1/2-1 cup of raisins or chocolate chips
  • Alternatively, buy a prepackaged bread mix!
  • 2 bread pans
  • 2 mixing bowls
  • Plastic wrap
  • Butter (to grease resting bowl and bread pans)

Before You Start:

I highly recommend organizing your ingredients before inviting your preschooler into the kitchen. When it comes to a potentially messy project like this, I find it helpful to get myself situated first.

Then, make sure everyone does a thorough hand washing. You will all be getting very touchy feely with this edible project! Let’s not turn this into a different kind of science experiment, right?

Making Your Bread

If you’re making your bread from a prepackaged mix, just skim the directions for when we make connections between the bread and universe! Make sure to add your raisins or chocolate chips into the mixture still!

Now, to make your dough from scratch. Mix your 2 cups of warm water and 1/3 cup of white sugar together in a bowl. (Note: this entire thing will be easier with a stand mixer, but it’s totally achievable with a little extra muscle and either a hand mixer or your hands!) Sprinkle your 1.5 tablespoons of yeast over the top and let it dissolve into the mixture for about 10 minutes (this is a great time to watch a video or read a book from this post!). Add your 1.5 teaspoons of salt, 1/4 cup of oil, and 3 cups of flour and mix it together well (this is a good step for little hands to take the lead!). Once it’s mixed well, add the other 3 cups of flour and chocolate chips or raisins.

Now, it’s time for some aggression to get it all combined. You’ll know it’s done when your dough pulls away from the sides of the mixing bowl. If you have a dough hook for your stand mixer, this would be the time to use it. Once it’s well mixed, flour your countertop (that’s clean!) and knead your dough. This is another great time for the kids to get involved. This is a good time to start drawing comparisons to the dough and “singularity” before the Big Bang. While they’re kneading, grease a bowl for your dough to rest in.

When the dough is finished, place it in your greased bowl and cover with plastic wrap. Ask them to make a hypothesis (guess) about what’s going to happen to the dough while it rests. Will it change size or shape? Bigger, smaller, the same? Will the chocolate chips/raisins still be in the same place, further apart, or closer together? Then, let the dough rest for an hour, checking on it every 10-15 minutes. As you check in on your dough, ask them to evaluate their hypothesis. Is the dough doing what they expected? What is happening to the add-ins? You can also begin to explain that this is kind of like what happened during cosmic inflation. There was a tremendous amount of heat and movement that caused singularity expand exponentially outward. All of the different “ingredients” mixed together to form matter and took different forms throughout the process.

When your dough has rested for an hour, remove the cover and punch down the dough, before moving it back to your floured counter. Cut your dough in half and roll out into rectangles. Roll those dough rectangles up into greased bread pans and let them rest again until they’ve doubled in size (less than an hour this time!). You can explain that the universe continues to expand, just like the dough, and that the objects in the universe continue to move apart (represented by the add-ins). (Note: You could also break your dough into two separate bowls before letting it rest the first time and do an extended experiment, perhaps leaving one to rest somewhere cool and one somewhere warm, or anything else you can dream up!)

As your dough nears doubling in size, preheat your oven to 350F. Make sure your preschooler knows that the oven is hot and use precautions to keep everyone safe! Bake your bread for 25-30 minutes, until you can tap and it sounds hollow. Let it cool before letting little hands touch it! You could continue to draw comparisons, by explaining how the bread is baking and changing forms with heat, or how the bread itself has spread out, creating holes inside the bread, like dark matter in the universe, or even how the universe and bread were both hot, but then cooled off into something we humans can enjoy!


DIY Atoms of the Early Universe

Preparing For This Activity

What You’ll Need:

  • Three paper plates (or circles cut out of paper)
  • Marker
  • Glue
  • Pom poms

Before You Start:

If you plan to do the accompanying math activity, you can have your little scientist do some of the pom pom sorting for you, but you’ll still need to presort out 18 pom poms, in different colored sets of 6. I suggest using red, yellow, and blue to keep the colors different enough for the sorting and imagery to be really effective and clear!

Making Your Atoms

You get to the be universe! It’s time to make atoms! This activity will yield three “atoms”, for the first three elements of the universe – hydrogen, lithium, and helium. Of course, you can make any atoms you want too!

You can choose to do this activity two ways – completing each atom individually or working on them all together. Whichever way makes the most sense for your learner.

Hydrogen Atom

Have your little scientist draw one large circle around the outside of the plate to represent the electron’s orbit.

Then, glue one proton (red pom pom) in the center of the paper plate (the nucleus). Glue one electron (blue pom pom) to the orbital path. And you have a hydrogen atom!

Helium Atom

Repeat the same steps, but this time, your little scientist will glue two protons (red pom poms) and two neutrons (yellow pom poms) in the center to form the nucleus, and two electrons (blue pom poms) to the orbital path. You have helium!

Lithium Atom

Repeat the same steps, but this time, your little scientist will draw two circles around the outside of the plate to represent the electrons’ orbit. Then, they’ll glue three protons (red pom poms) and four neutrons (yellow pom poms) in the nucleus and three electrons (blue pom poms) to the orbital path. You have lithium!

 


Have any other fun activities to suggest? Questions? Leave me a comment!

The Best Telescopes for Little Scientists

img_2215The stars are one of our first scientific curiosities as children. I think we can all remember the first time that we really looked up at the night sky and realized that there was an entire universe out there, not just ourselves or our families or our planet.

We all look up at the same beautiful, twinkling, infinite universe, but many with no idea of the magic it holds.

A good telescope is the gateway to unlock all of that magic and wonder (even in a tutu, as you see my daughter pictured here in our makeshift concrete block observatory!).

It’s nothing short of inspiring and is probably the easiest way to get kids excited about science and technology.

Please note that some of the links included are affiliate links. That means that if you follow the link and purchase something, I earn a small commission for my recommendation. This support helps keep my resources free and is much appreciated, so please consider using the link if you decide to purchase something from one of my posts!

How to Choose the Right Telescope

Not all telescopes are created equal. Many telescopes that are marketed to children are, quite frankly, pretty useless for the price. Here’s how to pick the best telescope for your family.

How Telescopes Work

Telescopes allow us to take a closer look at objects that are far away. They do this in two ways, by collecting more light and magnifying the image. A telescope can be as simple as two lenses, or much, much more complicated.

Aperture

Aperture (or sometimes called objective) is the diameter of the lens or mirror that’s used to collect light (or photons).

Remember that when you’re looking at celestial objects, you’re really looking at light, and that’s why aperture is so important. A bigger lens or mirror means a sharper and brighter image. The further away they are, the fainter their light is. It doesn’t matter how much you magnify a dark image – it’ll still be a dark image. Bring on the light!

If you live in a suburban or urban area, you’ll want a larger aperture (more light) to help cut through some of the light noise from your surroundings. If you live in a rural area, you can make do with a smaller aperture. However, you should aim for at least 70mm and remember that when it comes to aperture, more is always more, no matter where you are.

Magnification

The lens at the eyepiece is responsible for making the image look larger (magnified). A good eyepiece can magnify images, no matter how much aperture (light) your telescope collects. However, like I said before, a dark image magnified is still a dark image… and not much fun to look at. That’s why magnification isn’t as important as aperture.

Despite many marketing tricks claiming things like “500x magnification”, that’s unrealistic without incredibly high (and expensive) aperture and not really necessary. Magnification of just 50x will reveal all kinds of wonders from our solar system.

Types of Telescopes

A refractor is the “classic” telescope, much like the one Galileo used when he peered into the night sky. It uses a lens to collect light (aperture) and has an eyepiece (magnification). This design is rugged and good on the go, but does present a mirror image of the sky.

A reflector telescope uses a mirror to collect light (aperture) and was invented by Newton. Unlike a refractor, reflector telescopes present you with an image as it appears in the sky. This can be useful for little scientists trying to follow a star map, but they do require some occasional maintenance.

Then, there are compound telescopes that use components of both refractors and reflectors in their design. These designs are powerful, but not necessary for little astronomers!

Longevity vs. Budget

There are hundreds and hundreds of telescopes to choose from and hundreds and hundreds of good options. It really comes down to what you want to spend now, how much ease of use you want, and how long you want to keep the same telescope for.

Personally, I opted for a budget-friendly and easy-to-use telescope for my girls. I’m excited about the possibilities of their next telescope, but I wanted them to find their current telescope accessible and fun. Also, if their scientific interests carry them to other places than the night sky, I won’t be left heart broken at the expense!

The Science Mom’s Telescope Picks

The Science Kids’ Telescope

My kids have the Celestron Firstscope telescope, a Netwonian reflector telescope.

We love this telescope for many reasons and I’d highly suggest it for anyone starting to dive into the world of stargazing.

  • The Firstscope has a 76mm primary mirror, which collects enough light for us to make out awesome detail in the night sky, from the moon’s craters to Saturn’s rings.
  • It comes with 20mm and 4mm eyepieces, which gives us two ways to observe the night sky.
  • We have up to 75x magnification power.
  • The telescope has a tabletop style base that rotates, making it stable and easy to use with two little ones.
  • The optical tube is decorated with the names of famous scientists and astronomers. I love the symbolism as my girls stand on the shoulders thousands of brilliant minds before them as they gaze up into the sky.
  • It’s light enough to be easily transported around with us. Ruby can even carry it by herself.
  • Celestron has a free app (with in-app purchases) called SkyPortal that you can download to compliment your stargazing.

Other Beginner Telescopes

Orion Funscope

The Orion Funscope is similar in style to our Firstscope.

With 4.5 inch aperture and 25mm and 10mm eyepieces, you’ll be able to view objects with 50x magnification.

It also comes complete with a MoonMap and digital software download that allows you to view simulations of the night sky, great for little astronomers to learn their way around space.

Celestron Kids 50TT

The Celestron Kids 50TT is a basic refractor telescope that’s good for starting astronomers. It’s easy to set up and get to stargazing. With a 50mm aperture and 12.5mm eyepiece, it has 30x magnification.

This telescope is super lightweight, including its tabletop tripod, and comes with a carrying case to observe on the go.

Orion GoScope III 70mm

The Orion GoScope III 70mm is great for little astronomers on the move. It comes with a backpack to carry it around in!

With 70mm aperture and 20mm and 9mm eyepieces, this telescope has 44x magnification. It rests on an aluminum tripod. It also comes with a MoonMap and viewfinder to help locate objects before viewing through the telescope.

Orion 09007 SpaceProbe 130ST

The Orion 09007 SpaceProbe 130ST is the ideal telescope for serious junior astronomers. This telescope is the priciest on my list, with good reason.

With a 130mm primary mirror, its aperture is almost double our Firstscope. It also comes with 25mm and 10mm eyepieces, allowing for 26-65x magnification. The SpaceProbe also comes with a finderscope to help find objects quickly. The aluminum tripod is lightweight and has an accessory tray to keep your other eyepiece close.

Celestron 127EQ PowerSeeker

The Celestron 127EQ PowerSeeker is another great option for more serious stargazers.

It has a 127mm aperture and 20mm and 4mm eyepieces, allowing for up to 250x magnification. It also comes with a 3x Barlow lens that triples the magnification of both eyepieces. This telescope rests on a tripod that also has an accessory tray to keep eyepieces and the Barlow lens easily accessible.

In addition to Celestron’s SkyPortal app, it also comes with “The Sky” software to help locate thousands of items in the night sky!

 

Do you have a telescope at home? Leave a comment and tell us about it!

Ice Cube on a String {Learning about Freezing Point Depression}

IMG_0127It’s been a few days since I posted a new experiment. I hope you’ve been experimenting without us! We’ve been busy preparing for Ruby’s dance recital… and I’ve been resting my pregnant body. This sudden summer heat is taking a lot out of me!

That’s why we decided to do something quick, easy, and COLD. This is a fun experiment that can be turned into a party game. You’ll stump a lot of people when you ask them to get an ice cube out of a glass with only a salt shaker and piece of string – no touching allowed.

 

Ice Cube on a String

Materials:

  • A full cup of cold water
  • Ice cube(s)
  • 1′ long length of string (we used butcher twine from the kitchen drawer)
  • Table salt

Procedure:

  1. IMG_0962Place your ice cube in the cup of cold water. Make sure the water is cold, so that the ice cube doesn’t melt too quickly before you even begin. We learned that through our first failed attempt!
  2. Lay your string carefully across the top of the cup, making sure it has good contact with your ice cube.
  3. Pour salt over the ice cube and string.
  4. Wait a few seconds and grab the ends of your string. Your ice cube and string will have frozen together and voila! You have an ice cube on a string!

 

The Science:

IMG_0964Ice is frozen water. When liquid water reaches 32 degrees Fahrenheit or 0 degrees Celsius, it becomes ice, a solid. That means the freezing point for water is 32 degrees Fahrenheit.

However, when you add salt (a solute) to the water (a solvent), you create a solution, which is two substances mixed together. The salt and water solution must get even colder to freeze into ice, than just plain water alone. This is called freezing point depression. With a 10% salt (and 90% water) solution, it must be 20 degrees Fahrenheit or -6 degrees Celsius to freeze. With a 20% salt (and 80% water) solution, it must be even colder at 2 degrees Fahrenheit or -16 degrees Celsius. Brrrr! As nice as that sounds on a hot, humid summer day like today, that’s reeeeeally cold! Frostbite cold!

IMG_0966If you’ve ever been to or lived up north, you may have seen big salt trucks driving around pouring salt onto icy patches of road or sidewalks. That’s because when the salt mixes with the ice on the ground, it melts. Many people think that the salt somehow heats up the ice and melts it, but that’s not the case! As we talked about above, the salt just lowers the freezing point for the water, converting it back into a liquid instead of allowing it to stay frozen as solid ice. It should be noted that salt can’t melt solid ice directly – it must be mixed with water and then applied to the ice. However, most ice and snow is actually covered in a thin layer of water, so when you apply salt on top, nature has already helped you create your salt water solution with no effort needed from you!

For this specific experiment, the salt lowers the melting point of the water that’s been frozen into the ice cubes. Because there’s so little salt and so much water, the salt doesn’t do a very good job of lowering the freezing point for long, so the water quickly freezes back  into solid ice, trapping your string in the process.

Let me know if you try this experiment – or better yet, if you challenge your friends to figure out how to make it work! We plan on trying to stump a couple of our friends with it this week!

FullSizeRender

 

 

 

5 Science Gifts for Tiny Toddler Scientists

Birthday party season is upon us! For some reason, a large cluster of the Science Kids’ friends were born in the spring/summer. I feel like we spend most of our weekends during this time attending birthday parties of the kids we love!

And what else would the Science Mom give, but science? (Dinosaurs, actually. We are kind of known for always including something dinosaur-related. But that’s still science, right?) I keep these bookmarked on Amazon Prime, so they’re ready to be ordered, tossed in a gift bag (along with a book and possibly a dinosaur or two), and head out to a friend on their special day!

So, without further ado, here’s my list of my five favorite, fun science gifts to give our tiny scientist friends!

Please note that some of the links included are affiliate links. That means that if you follow the link and purchase something, I earn a small commission for my recommendation. This support helps keep my resources free and is much appreciated, so please consider using the link if you decide to purchase something from one of my posts!

1. GeoSafari Jr. My First Microscope

At under $20, this little “microscope” is a fun way to introduce science equipment to little scientists.

It features 2.5-8x magnification, which is more like a magnifying glass and obviously significantly less than a standard microscope. However, that’s why I like this microscope for toddlers. At these lower magnifications with a larger field of view, little brains can begin to understand how microscopes work and what they’re looking at.

It also features an LED light, and non-skid feet to keep it in place. Its chunky design is also great for little hands to still be able to manipulate it independently.

On a personal note, I gave my daughter and her best friend both this microscope for Christmas two years ago. I’ve been surprised by how durable it is, in part thanks to its plastic lenses. My kids are not delicate and it’s surviving just beautifully! They’ve both been having fun looking at leaves, dead bugs, their hands, and random household items.

2. Primary Science Binoculars

For around $13, this is a really adorable pair of binoculars for little bird watchers and nosy toddlers.

I love the chunky design here too. Combined with the rubber eye pieces, plastic lenses, and textured grips, it is really designed for little hands to hold and use independently. I also like that the neck strap is a breakaway design.

The binoculars have a 6x magnification, which is, again, just the perfect amount for them to begin to understand the concept of using binoculars and also what they are actually looking at.

My daughter has taken her pair all over the place, from road trips to the park to local music events.

3. Learning Resources Primary Science Lab Set

Coming in under $20, this lab set is probably my favorite thing to gift little scientists. The pieces in this set are “iconic” science, right?

This 12-piece set includes everything they need to start exploring the lab world, including a beaker, magnifying glass, funnel, eyedropper, flask, tweezers, goggles, and test tubes! It also comes with activity cards to inspire both them and the adults helping them.

Again, the chunky design of these tools makes them ideal for little scientists to work semi-independently and feel like they’re in control of their own experiments. While they’re plastic and kid-friendly in every way, they’re still functional and we routinely use them in our experiments at home!

If you’re looking for something more, there’s also a 45-piece deluxe lab set that expands to include more lab equipment and a ViewScope. Learning Resources also makes a kid-sized lab coat that’s at the top of my daughter’s wish list!

My First Mind Blowing Science Kit

I mean, who isn’t excited when they see the title of this science kit? Mind blowing! And for only $15!

It’s packed with fun goodies to conduct a variety of science experiments and introduce STEM principles, including things like test tubes and a pipette, as well as chemicals like red cabbage powder, citric acid, and baking soda. There are some household items you’ll need to supplement the kit, so check the list before you plan to get started.

This kit definitely requires some adult supervision and assistance, but you definitely don’t need to be a scientist to help. Adults will have as much fun as their little scientists with activities like a sunset in a tube, a color-changing volcano, and jiggly crystals.

5. Boley Big Bucket of Dinosaurs

At around $15, this 40-piece dinosaur set provides lots of fun play for budding little paleontologists.

This set combines realistic-looking (not cartoony, like so many sets) dinosaurs and landscape pieces that encourage a lot of imaginary play, but can also open the door for lots of educational questions and talk about dinosaurs.

We’ve had this set in our house for over two years now and the figures have held up really well to almost daily play. I also like that it comes with a storage bucket, so they’re not all over the place. That being said, we did convert our train table into a dinosaur landscape for a while, thanks in part to some of the landscape pieces that come in this bucket. It was a lot of fun to see my daughter’s imagination at work as we constructed it!

Do you have a go-to science gift that didn’t make my list? Leave me a comment!

Making It Rain {Learning About the Water Cycle}

IMG_0127Another day, another project as we experiment our way through the summer! We hope you’re joining us – or at least getting tempted to.

You can, of course, follow our experiments here, but also on the Science Mom Facebook page! You can also find other fun experiments on the Science Mom Pinterest boards or scrolling through this summer series here on the blog!

FullSizeRender 2Today, I decided to use Mother Nature for inspiration. After all, the radar was looking like this. Bah! The forecast kept getting pushed back further and further, but we skipped our trip to the splash pad anyway. Who needs a splash pad when you’re getting wet in your own kitchen and backyard, right?

I decided on not one, not two, but three projects today, as a splash pad apology to my toddler. I’m still not sure she forgave me for missing out on the fun with her best friend, Jax, but we had fun anyway!

 

Making It Rain, Part One

Materials:

  • A shallow dish (or any kind of pan, tray, bowl, or water-holding vessel)
  • Cotton balls
  • Water

Procedure:

  1. IMG_0310Fill your water-holding vessel with water. An inch or so should do it.
  2. Take a cotton ball “cloud” to explore. Note that the cotton ball is fluffy and doesn’t weigh much. It’s also very dry.
  3. Slowly, dip the cotton ball “cloud” into the water, allowing the water to slowly soak the cotton ball. Now your cloud is filled with rain-to-be. Note that it feels heavy and may have even changed shapes.
  4. Lift the cotton ball out of the water. The cotton ball is so saturated that water droplets will begin to fall back into the water-holding vessel. The more saturated, the faster the rain drops fall.
  5. Explain that this is [roughly] how the water cycle works. Not sure how the water cycle works exactly? No worries. Read on!

 

Making It Rain, Part Two

Materials:

  • Clear cup or jar (plastic or glass is fine)
  • Shaving cream
  • Water
  • Food coloring

Procedure:

  1. IMG_0315Fill your cup with water, leaving a small space at the top for your shaving cream.
  2. On top of the water, squirt shaving cream to create a nice, fluffy “cloud”.
  3. Carefully add drops of food coloring to the top of your shaving cream cloud.
  4. As the cloud gets heavier with the added food coloring, it will slowly begin to “rain” food coloring down into the cup. (Make sure you’re adding the food coloring slowly. Once it makes its way through the shaving cream, it will spread through the water quickly. If you’ve added too much, the water will rapidly change color and the experiment gets decidedly boring instantly!)

 

Making It Rain, Part Three

Materials:

  • Large glass jar (or bowl or measuring cup)
  • Paper plate or bowl large enough to cover the opening of the glass container
  • Water
  • Ice cubes

IMG_0309

Procedure:

  1. Heat water, either in the microwave or bring to a boil on the stovetop. (I recommend that a parent take care of this step and warn little hands that the glass jar will be hot hot hot!
  2. Transfer the water to your glass jar.
  3. Quickly, top the jar with a paper plate. Cover the plate with a pile of ice cubes.
  4. Watch as a mini water cycle emerges inside your glass jar!

 

The Science:

Rain is just one small part of the water cycle, the really awesome loop that Earth’s water has been traveling through from the ground to the sky and round and round again for billions of years. Water is never really “still”, even when it’s not actively going through the water cycle. Most of Earth’s water is stored in our oceans (roughly 96.5% of it, or 321,000,000 cubic miles) and we know the ocean is never still!

Water-Cycle-Art2A_mediumTo explain the water cycle to kids, it’s easiest to break it down into four stages: evaporation, condensation, precipitation, and collection.

Let’s start with evaporation. That’s when the sun heats up collected water, which turns it into water vapor (a gas that we usually can’t see). This is how water begins its journey from the ground back up into the atmosphere. There are a couple of other ways that water can leave the ground. One of those ways is sublimation, which is when solid water (ice or snow) is heated and turns directly into water vapor. This is the process you see when dry ice turns into a big cloud of water vapor, or directly from a solid into a gas, without making a pitstop and becoming a liquid. (To be clear, this is not like when ice melts and turns into water and then eventually would evaporate into water vapor!) Another way that water evaporates is through transpiration, which is basically plant sweat! Water travels from the soil, through the plant roots, and transpires (sweats) through the plants’ leaves to become water vapor and head up into the atmosphere. It’s estimated that about 10% of the water in Earth’s atmosphere is from plant transpiration.

The next stop for all of that water vapor is condensation. As water vapor moves higher and higher into the atmosphere, it finds colder air. That colder air turns the water vapor back into a liquid. Those cooling water molecules find tiny particles in the air (like dust, smoke, or dirt) to cling to and form cloud droplets (very, very tiny drops of condensed water), which collect and grow to form clouds (this part of the process can be called coalescence). You see condensation all the time. When you pour a cold drink into a glass, you may see condensation form on the outside. That’s warm water vapor from the air around your glass being cooled by your drink and turning into water droplets. Your glass is kind of your own personal cloud!

As the cloud grows and gets heavier, we prepare for precipitation. The condensed water falls back to the ground in the form of rain, hail, snow, or sleet. This is no small task, as it takes millions of those little cloud droplets to collide and form a single rain drop. Once a rain drop is formed, it then has to have enough velocity to make it out of the cloud and fall as precipitation! In a really heavy rainstorm, the drops are falling at a speed of 24 feet per second – that’s a little over 16 miles per hour. There are some parts of the world where hardly any rain at all falls (less than 0.1 inches per year) and some where tons and tons of rain falls (900 inches per year). There’s a place in Chile where no rain (none!) fell for 14 years! 14! Rain is a pretty incredible thing when you stop and think about it all, right?

After the rain falls, the next stage is collection. That’s where the water settles here on Earth. Like I said before, about 96.5% of Earth’s water is stored in the oceans. The rest of that water (3.5%) is what we have in the atmosphere, lakes, ice caps and glaciers, rivers, streams, puddles, and everywhere else in the world! That really gives you an idea of the huge volume of water in the ocean.

And just like that, we are looping our way back through the water cycle. There are tons of other fun experiments and projects to learn more about it… and we will definitely revisit all of this again soon! For now, it’s time to check our rain gauge one last time and call it a [rainy] night!

I’ll leave you with one last thought. The water that you’re taking a bath in tonight could be the very same water that a dinosaur bathed in too. RAWR!

 

FullSizeRender

Sandwich Bag Blasts {Learning About Acids and Bases}

IMG_0127Today marked our first project, as we experiment our way through the summer. We hope you’re joining us!

If you’re spending your summer with science, let us know on social media or in the comments section here. We’d love to hear about other families’ experimental summers!

These sandwich bag blasts were our version of celebratory fireworks this afternoon. Lucy (daughter #2) is currently in utero and there were concerns about her cerebellum development at our anatomy scan. Today, our MFM specialist gave her a clean bill of health and released us back to my regular OB-GYN. It’s a major weight off of our shoulders, so we were thrilled to celebrate the news with some backyard explosions! BANG BOOM POP HOORAY! BABY LUCY IS OKAY!

 

Sandwich Bag Blasts

Materials:

  • Zip lock sandwich bag
  • Paper towel
  • Baking soda (1-1/2 tbsp)
  • Vinegar (1/2 cup)
  • Warm water (1/4 cup)

 

Procedure:

  1. Check your sandwich bag for holes. If it’s not water-tight, you won’t get that magnificent BANG that young scientists crave. You can check it by filling it with water and shaking it around to spot leaks – or just rely on your eyesight to identify any holes.
  2. Rip your paper towel into a 6″ square (roughly, into quarters).
  3. Pour 1-1/2 tbsp of baking soda into the middle of one paper towel square.
  4. Fold up the paper towel, so the baking soda is safely nestled inside a pocket.
  5. Add the 1/2 c of vinegar and 1/4 c of warm water to the sandwich bag.
  6. Quickly, add the paper towel pocket into the sandwich bag and seal it. Emphasis on quickly.
  7. Shake, shake, shake your bag to get the reaction really going.
  8. Set down your sandwich bag, step back, and watch it swell, before BANG! The bag pops and you can call yourself the Sandwich Bag Bomb Squad.

 

 

The Science:

Almost all liquids can be qualified as either an acid or a base. Acids produce more hydrogen  (H+) ions when added to water, which deems them more acidic. Meanwhile, bases produce more hydroxide (OH-) when added to water, which deems them more, you guessed it, basic. You can thank chemist Svante Arrhenius for this classification system!

Acids (the ones with more hydrogen ions) have a sour taste and can even dissolve other materials (we call that “corrosive”). In fact, the word acid is derived from the Latin word acidus, which means “sour”. The best example of an acid is our own stomach acid, that helps us break down the foods we eat.

Bases (the ones with more hydroxide ions) can have a bitter taste and tend to be on the more slimy (think: icky) side. We also call bases “alkali” because they are “alkaline” (not acidic). An example of a base would be soap – the soap we wash our bodies with and even laundry or dish soap!

Acids-and-Alkalis-The-pH-ScaleAll of these liquids have a place within the pH scale, which ranges from 0-14. Strong acids make up the lower part of the scale (0-4), while strong bases make up the higher part of the scale (10-14). In the middle of the pH scale is 7, which is “neutral” and is neither acidic or basic. The best example of a neutral is water

Both very acidic and very basic liquids can be equally dangerous, so it’s best to work with items within the middle of the PH scale when we do experiments like this! Professional chemists use those strong acids and bases to create big reactions in chemistry labs, so if you like explosions and reactions, you might have found your future major or career!

In this particular experiment, the vinegar (acid) and baking soda (base) cause a chemical reaction that produces carbon dioxide. That carbon dioxide fills the bag and, after running out of room to continue expanding, pops the bag open with our thrilling BANG!

 

FullSizeRender