Chemical reactions: decomposition

12 questions

1. What are common signs that a chemical reaction is taking place?
2. In a chemical reaction, what happens to the atoms of the reactants?
3. What happens to the mass of the products compared to the mass of the reactants in a chemical reaction?
4. What type of reaction involves a substance combining with oxygen?
5. To test for carbon dioxide, you would bubble the gas through ___. If carbon dioxide is present, the solution turns milky (cloudy).
6. Which of the following chemicals are reactants in this reaction?zinc + hydrochloric acid → zinc chloride + hydrogen
7. What is a decomposition reaction?
8. Decomposition reactions usually require ___, light, or electricity to occur.
9. What gas is commonly produced when metal carbonates decompose?
10. Which of the following is a decomposition reaction?
11. When metal carbonates decompose upon heating, they typically form metal ___ and carbon dioxide gas.
12. Which of the following reactions represents the decomposition of water?

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