Practice Examples Of Chemical Changes (2.3) - Physical and Chemical Changes

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10 questions

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3 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
4 questions · about 3 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is a chemical change?
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Think about what happens when iron rusts.
Question 2.
Is melting ice a chemical change?
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Consider if the ice can turn back into water.
3Question 3.
What is a key sign of a chemical change?
- No color change
- Gas production
- Reversible change
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Remember examples like fizzing when vinegar combines with baking soda.
4Question 4.
True or False: Rusting is a physical change.
- True
- False
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Consider if the iron returns to its original state.
Question 5.
Explain the chemical reaction that occurs when vinegar and baking soda are mixed. What are the products, and what signs indicate a chemical change?
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What do you see and hear when they react?
Question 6.
Calculate how long it would take for a piece of iron to rust completely in different environmental conditions (dry, humid). Consider changes in temperature and moisture.
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Research common conditions for rusting.

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