Te Ariki helped lead an investigation into chemical reactions. The first time he tried to make a rocket explode with baking soda and vinegar, it didn’t quite go to plan. The lid didn't close properly, and the bottle squirted everywhere, including in Te Ariki’s hair! Even though it didn’t fly, there was a lot learnt from what went wrong. One issue was putting too much baking soda in the lid, and it couldn’t seal properly.
To adapt the experiment Te Ariki suggested using a different bottle that could build up more pressure. He tried a bottle with a different lid: one with a screw top and one with a push on lid. The screw top didn’t work, even when it was left slightly looser. The pressure did not build up and did not force the lid off. It worked with the push-on lid, the rocket launched into the air!
Callan shared that we thought a bigger bottle would work better because it had more room inside for the reaction but it actually didn’t fly. That was because the lid didn’t pop off and the pressure wasn’t strong enough. Smaller bottles can create more pressure in less space.
When making oobleck using cornflour, water, and food colouring, it felt like a liquid when it was poured. When the oobleck was punched or tried to be grabbed it turned solid. Riley noticed that at first the mixture was too runny because we added too much water.
We re tried and added more cornflour. Then it became this weird hard liquid. When I punched it, it felt solid, but if I left my hand in it, it just sank.
Oobleck helped us understand that not all materials fit into simple categories like “solid” or “liquid.” It acted like both depending on how we handled it. It was messy but really interesting.
What was learnt:
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From the rocket experiment, how pressure and chemical reactions can create movement (and that too much baking soda can be a problem).
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From oobleck experiment, some materials can change their properties depending on force. These are called non-Newtonian fluids.
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The importance of trial and error, working together, and reflecting on what didn’t work so we could make improvements.
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