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Crystal Chemical Changes Investigation
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Crystal Chemical Changes Investigation
With an adult, investigate what happens when bicarbonate of soda and citric acid are mixed with water. Do not taste anything. Keep the mixture away from your eyes, and wash your hands afterwards. Record what you predict, observe and conclude.
Before the test
Use equal small spoonfuls of bicarbonate of soda and citric acid. Add them to a cup with a little warm—not hot—water. Watch closely. An adult should help prepare and handle the materials.
1.Before mixing, predict what you think will happen when bicarbonate of soda and citric acid meet water. Include one thing you expect to see.
2.After mixing, tick every change you actually observe: bubbles or fizzing; a new colour; the solid powders getting smaller or dissolving; a change in temperature. Do not tick anything you did not notice.
3.Choose the best explanation for the bubbles made in this reaction.
- A gas is being made.
- The mixture is boiling.
- The cup is making air.
4.Write two observations that could help someone else know what happened. Use details such as what you saw or heard. Never taste the mixture.
5.Is the fizzing reaction mainly a physical change or a chemical change? Give one piece of evidence for your choice.
6.The starting powders seem to disappear into the fizzing mixture. Can you simply wait for the original bicarbonate of soda and citric acid crystals to reappear? Explain your thinking.
7.A group wants to compare how quickly the mixture fizzes in cold water and warm water. Name one thing they should keep the same to make it a fair test.
8.Choose one question you could investigate about this fizzing reaction. Write what you would change and what you would observe or measure.
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