This activity is an old favourite and always works well so today I tried it again with a new group of Science Club kids.
Here are the instructions:
The students observed what was happening and wrote the following notes:
- There was a chemical reaction between the ingredients.
- The plastic bag puffed up so a gas must of been produced.
- The mixture fizzed and bubbled which also shows a gas must of been produced.
- The first mixture went really cold. This is an endothermic reaction.
- The second mixture went really hot. This is an exothermic reaction.
- Reaction 1 - we mixed a base (baking soda) with and acid (tartaric acid) so the reaction produced carbon dioxide.
- Reaction 2 - we mixed 2 bases so why did it fizz and bubble and produce gas???
- The water helped to mix the 2 powders together.
- Some of the bags popped when they filled with too much gas.
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Carefully lowering in the water. |
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The mixture fizzes and puffs up the bag. |
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Watch out - It's going to explode! |
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