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Fizzy Sherbet Reactions

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Fizzy Sherbet Reactions

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Part 1: Predict and Investigate

Learning intention: Identify evidence of a chemical reaction and explain why sherbet fizzes.

Safety: Wear goggles, do not taste or smell lab materials, keep the mixture away from your eyes, wash your hands, and dispose of the mixture safely.

Method: Add one measured spoon of dry sherbet to 20 mL of water. Observe it for 60 seconds. Record what you see, hear and feel. Do not consume the mixture.

1. Predict what will happen when dry sherbet meets water. Explain your prediction.
2. Circle two observations that could be evidence of a chemical reaction.

Bubbles form

The cup stays the same

The temperature changes

The spoon is still there

3. Which safety action is correct?

Taste the mixture to check what it is like

Wear goggles and wash your hands afterwards

Rub your eyes if powder gets near them

Results

Complete the results record after your investigation.

Observation
Appearance, sound, bubbles, foam or temperature change
What changed during the test?
Evidence of reaction
What does this observation suggest?
For example: bubbles suggest gas was produced
Explanation
Why might this change have happened?
Use scientific words where possible

Part 2: Explain the Reaction

4. In this investigation, the reactants are the starting substances. Name the acid and the carbonate involved.

The acid is ____________________________ . The carbonate is ____________________________ .

5. What product gas is made when the acid reacts with the carbonate?
6. Explain at particle level why fizzing happens when water is added.

Use these words: acid, carbonate, react, carbon dioxide, bubbles.

7. Complete the sentence: Dry sherbet does not fizz strongly because the particles need __________________ to move and react.
8. Write a conclusion using claim, evidence and reasoning. Include the words acid, carbonate and carbon dioxide.
9. Design a fair test to compare room-temperature water with chilled water. What will you change, and what must stay the same?

Part 3: Exit Ticket

10. Why does sherbet fizz when it meets moisture in your mouth? Give one safety reminder for a science investigation.

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