Melting Ice

First, our class did an experiment to see what would melt ice the quickest, water, salt, or baking soda.  

While we waited we worked as a team to melt an ice cube using our hands.

It was a little messy, but lots of fun 🙂

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100 Toothpick Challenge

Ms. Pjura forgot the ice for our science experiment today so we did “Fun STEM Friday” on Thursday 🙂 Challenge: Build the tallest, free-standing, structure using only the materials provided. Materials: 100 toothpicks and half a bag of mini marshmallows. Results: The tallest structure was built by the blue team, standing at 5 inches tall. Continue reading →

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We learned about pH levels and conducted an experiment to find out which liquids are acids and which are bases.  We used cabbage juice as our indicator.  The liquids we tested were: milk, water, soapy water, baking soda in water, lemon juice, orange juice, and vinegar.

Here’s a picture of the results:

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From left to right: soapy water, orange juice, milk, lemon juice, water, baking soda and water, vinegar.

The acids turned a pink/red color (orange juice, lemon juice, vinegar)

The bases turned a blue color (soapy water, milk, baking soda and water)

And water is neutral (it didn’t really change color).

STEM Friday

Challenge: Create a tool, using the materials provided, that will allow your team to stack and unstack six cups. Materials: Five pieces of yarn and one rubber band Rules: Only the tool can touch the cups.  Hands can only touch the yarn.

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This time we tried to inflate a balloon with some magic powder (baking soda) and liquid (vinegar).  And it worked!  I was scared the balloon would explode and make a huge mess but it worked perfectly!  What gas is produced when vinegar and baking soda are combined that allowed the balloon to inflate?

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