Activity of the Month

November 2019: 3Doodler Pen

From Rosie Art Shop
From 3.D.pen.art

Putting the "A" in STEAM

I will admit I wasn’t sure whether to share all the goodness that is 3Doodler pens now vs after the holidays, as getting a 3D pen would make an awesome Christmas/holiday gift, but ultimately decided to share it now because:

  • You can participate in a really cool project called 3D Giving Day 
  • Opportunity to make holiday decorations or gifts
  • Current (and likely upcoming) sales
  • You could also get it as a holiday gift and wait to open it up (though you’d miss out on some of the above)

So what is the 3Doodler Pen? It’s a 3D pen. 

There’s actually two of them, the Start pen (designed for ages 6-13) and the Create pen (ages 14+). I’ve only used the Start pen, so I’ll be keeping my review/suggestions focused on that one. The 3Doodler Start pen melts the plastic at a really low temperature, so low that you can actually touch the tip and the melted plastic without burning yourself (and no, I don’t have some ridiculous high temperature tolerance), making it safe for kids. The other feature that sold me on using these in our programs is that the plastic is corn-based, and is actually compostable should you have scraps or a creation you don’t want to keep. Given that we’re always seeking the more sustainable approach, one of my first questions about using 3Doodler was actually the plastic and waste generated. Clearly, they were thinking about this too in designing the pen and plastic! Besides all of this, the 3Doodler Start is a great tool for being creative and for building STEM projects (more info below). 

3D Giving Day explained: 

“This year, International 3D Printing Day and Giving Tuesday both fall on December 3rd, and we thought this would be the perfect time to share your Doodles with those who have never been able to experience them before. We are calling this day 3D Giving Day, a first-of-its kind humanitarian day centered around giving 3D creations.

Could you experience the humor and horror of Dr. Seuss’ How the Grinch Stole Christmas! without seeing the grumpy grinch himself? With 3Doodler pens, it is possible to bring these remarkable illustrations to those who have never seen them before. By feeling 3D outlines, people with visual impairments across the world can experience these classic characters in a new way. We have teamed up with Build a Better Book to make this dream a reality. We’re asking classrooms, artists and individuals across the globe to join us in making cherished illustrations accessible.” 3Doodler

The ESSTEAM Lab is entering a hiatus from leading programs, but we are still going to participate in 3D Giving Day by doing a few illustrations of our own, and then partnering up with the local library and makerspace program. We’ll lend out our 3D Start pens, and let the students enrolled in that program work on their illustrations. I’m super excited to see how this all turns out, and am actually counting down the days for this because it’s such a cool program. I’d highly encourage you to participate; for more info you can check out this link: Giving in 3D

Using 3Doodler Start for STEM and Creativity

One of the great things about 3D design is that you can design anything from a functional piece, to something artistic or decorative, or even building something with a STEM focus like a bridge or marble roller coaster. There’s a lot of possibilities, and 3Doodler also has kits and molds to help create some great projects. So your “Activity of the Month” is to create what your heart desires! Use one of the kits for a guided project or create your own thing. 

Buying 3Doodler

There are several places to buy 3Doodler pens and kits for guided projects: Amazon, Target, WalMart, and of course their website. I’ve included a few links below (just click on the images). For full disclosure, the Amazon links are affiliate links, meaning if you go through those links and make a purchase, ESSTEAM Lab will receive a small compensation at no cost to you. I do highly recommend check out 3Doodler’s website, especially the “Deals” section of their Shop, since they rotate through putting various kits or plastic sets on sale. 

3Doodler Start Shop

October 2019: Spooky Reaction

Vinegar + Baking Soda: who hasn’t had fun with this reaction? 

If I were to ask what happens when baking soda combines with vinegar, most people would be able to answer with some variety of “fizz”, “bubbles”, “a mess”, etc. It’s the basis of the well known and loved science fair volcano. But there’s three extra things you can do with this set-up of the reaction besides just ooh and ahh over the fun reaction. This is a great weekend or after school activity using materials you likely already have on hand, and you can add the fun Halloween twist to it to make it “new”. If you do this activity, don’t forget to take some fun pictures! Feel free to share them using our social media hashtag, #MakingSTEAMsustainable. 

For your basic setup, you’ll need:

  • Baking Soda (~2 Tbs)
  • Vinegar (~1/2 c)
  • Balloon
  • Narrow-ish mouthed bottle (a glass bottle works best)
  • Spoon
  • Optional but helpful: funnel, rubber band, thermometer, pH indicator or test strip, and food coloring. 

You may be wondering: why the thermometer in the optional materials list? 

One of the three components to this activity is measuring the temperature change from the reaction. The other two are comparing the density of a CO2 filled balloon with the air around us, and measuring if there is a pH change when CO2 mixes with water. 

Procedure:

  1. Put ~1/2 c vinegar into the bottle 
  2. Measure and record the temperature of the vinegar. You can do this just by feel or by using a thermometer if you have one available. Do you think it will get warmer or colder after the reaction? 
  3. Spoon about 2 Tbs baking soda into the balloon (this is where the funnel is helpful)
  4. Place the balloon over the mouth of the bottle and secure it with the rubber band, as in the third picture.
  5. When ready, lift the balloon up and allow the baking soda to fall into the bottle and enjoy the reaction!
  6. Halloween twist: use a white balloon and draw your best ghost face on the inflated balloon! Or use an orange balloon and make it a pumpkin, or design your own balloon based Halloween decoration. 

Question #1: how did the temperature change? After the fizz has died down a little, go ahead and feel the bottle or measure the liquid temperature. Did the result surprise you? The science behind this (source: American Chemical Society) is that every chemical reaction is accompanied by a change in temperature. Sometimes the change is barely noticeable and other times it’s extreme. Sometimes the temperature goes up and other times it goes down. In this reaction, Baking soda reacts with the vinegar to produce carbon dioxide gas, sodium acetate, and water. It took energy to break the baking soda and vinegar apart and energy was released when the carbon dioxide, sodium acetate, and water were formed. Since more energy was needed to break the baking soda and vinegar apart, the temperature went down. This reaction is called an endothermic reaction. 

Question #2: If you tie off the balloon, which is now filled with CO2 gas, and let it go in mid-air, will it sink, float, or rise? The chemical equation for the reaction between baking soda (sodium bicarbonate) and vinegar (acetic acid), looks like: NaHCO3 + HC2H3O2  NaC2H3O2 + H2O + CO2

In English, the reaction produces CO2 gas, liquid water, and sodium acetate. The CO2 is what blows up the balloon and fills it. If you take off the balloon from the bottle and tie it off with the CO2 in it, you can then test the question above: will it sink, float, or rise? 

Question #3: If you were to blow CO2 into water, how would that change the pH of the water? The baking soda and vinegar reaction is an acid/base reaction (vinegar=acetic acid). pH is a measurement of the hydrogen (H) in an aqueous, or water containing, solution. Measured on a scale of 0-14, acids are below a pH of 7, and bases are above, with 7 being neutral. How do you think adding CO2 gas to water could change the pH? If you have a way to measure pH, such as an indicator, pH meter, or test strip, you can find out. If you’re careful and talented, you could cut a small opening in the neck of the balloon while pinching it off, place it over a straw, then release the pinch and let the gas bubble into the water. Afterwards, you can measure the pH. If you don’t want to deflate the balloon, given that humans exhale CO2, you can simply blow bubbles through a straw into water for about a minute to get a pH change without destroying your CO2 balloon. 

I hope you enjoyed this activity! Please feel free to provide any feedback or ask questions about these tests. 

September 2019: Squishy Circuits

Did you know that playdough is conductive?

Add an LED or two and battery with wires and you’ve got yourself a hands-on circuit building activity. This is a great at home and hands on activity for kids to explore building circuits. Possible learning experiences include how to build different types of circuits (like simple or parallel), how to correctly position the positive and negative anode of the battery to ensure energy flow, a short circuit, and conductivity. 

  • Recommended ages: 5+ 
  • Time: 30 minutes+
  • Materials you may already have: Playdough and several AA batteries or a 9V battery
  • Materials you may need to buy: LEDs (~$8 for 20), battery holder/wires (~$6/2 for AA or ~$5/5 for 9V), modeling clay (~$6/2lbs); total cost ~$20 for up to 2 kids. 

Materials

Disclaimer: I have personally used all products listed below. Whenever possible, I use an affiliate or referral link*, for which the ESSTEAM Lab will receive a small compensation when you purchase from my links (clicking on the product image), at no extra cost to you.

Playdough

Most playdough is conductive, meaning energy or an electrical current can flow through it. If you don’t have any playdough, you can make your own! Here’s a good recipe:

  • 1 cup water
  • 1 cup flour
  • 1/4 cup salt
  • 3 tbsp cream of tartar or 9 tbsp lemon juice
  • 1 tbsp vegetable oil
  • Optional: food coloring (a few drops)

Place all of the above into a pot, and mix well over medium heat, stirring continuously, until a dough ball forms. Carefully remove the pot from the heat and dump the play dough back into your mixing bowl. Wait several minutes for the mixture to cool. Once it has cooled down, knead (mix the dough with your hands) in additional flour  (~1/2 cup) until desired consistency is formed. It will keep well in the fridge in an airtight container for several weeks and can be used for play beyond squishy circuits!

LEDs

The LEDs are the lights of the squishy circuit. You can use anything from 3mm to 10mm LEDs, as long as they have the wire legs to “plug” into the playdough. Alternatively, you can also use LEDs that have flexible wire legs with an insulating cover. However, what I recommend is a pack of 10mm wire leg LEDs, and if you want to make it even more fun, get the color changing LEDs! I’ll put two options to purchase below. 

Color Changing 10mm LEDs

Batteries and wires

At minimum, you’ll need 3V of power going into your circuit. However, I recommend 6-9V of power, which you can build through 4 AAs (each AA is 1.5V) or a 9V battery. Once you have your battery, you’ll need a battery holder or connecting wires to power your squishy circuit. Below, I’ll show tried and true battery holders and connectors that you can purchase. 

Modeling Clay

Using modeling clay adds an extra element to working with squishy circuits, as it is an insulator. You can certainly explore squishy circuits without modeling clay but it allows you to build more complete structures, such as the butterfly in the example above. If you were to join the two halves of playdough together, you’d create a short circuit, but having the clay in between solves that issue. I’ve put a link below to some good modeling clay (again, you can use this for play beyond squishy circuits!). OR you could also make insulating playdough with the following recipe:

  • 1 cup flour
  • 1/2 cup sugar
  • 3 Tbsp Vegetable Oil
  • 1/2 cup Purified Water (Deionized)
  • Optional: Food coloring (a few drops; use a different color than homemade conductive dough!)

Mix the flour, sugar, and vegetable oil in a mixing bowl.  Stir until all oil is absorbed. Pour small amounts of the purified water into the mixture and stir until water is absorbed.  Repeat this until ball forms. As necessary, knead small amounts of flour into the ball until it is no longer sticky.

Tips for Exploring Squishy Circuits

As always, safety first!

Kids should be supervised with the batteries (they can deliver a slight shock if both wires touch the skin, and if the two wires are left touching, they could begin to smoke or spark). If you elect to make your own conductive playdough, it should be a mostly adult-conducted activity, since the dough will be hot and if you’re not careful to stir continually, it can start to burn in the pot. 

Basic Set Up

Separate your playdough into two lumps, plug a battery wire into each, and use the LED legs as a bridge between the playdough. Make sure to put the slightly longer + LED leg into the playdough with the red + wire going into it. To reiterate, red wire is +, longer LED leg is +, and they must match in order for the circuit to work. 

Short Circuit

If your playdough pieces are touching, or if you have another conductive material (such as aluminum foil) connecting the playdough, the current won’t make the energy leap into the LEDs. I like to explain it such that the LED acts as a bridge to complete the circuit; if there’s no need for the bridge, the energy doesn’t go up into the light. Here’s where the modeling clay helps- you can make a solid object, with two halves of conductive playdough separated by the modeling clay. Again, I recommend using a different color playdough vs clay to make sure you know which is which. 

Other than these lessons, I like to leave squishy circuits open to the kids to play with and learn from. You could give them challenges such as building a parallel circuit or giving them a specific creative prompt of something to build. 

We’d love to see your Squishy Circuit creations! You can find us on social media (Facebook and Instagram) and share your pictures or videos using #MakingSTEAMsustainable

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