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Grades 6, 7 and 8 - Science - Middle School - Reactions, Equations and Formulae
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Avg score: 5% • Most missed: “The formula for calcium hydroxide is Ca(OH)2. This means .......”

When atoms of two or more elements join together, a chemical reaction has taken place.
 

Grades 6, 7 and 8 - Science - Middle School - Reactions, Equations and Formulae
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10 Questions

1. Which of the following is the correct balanced equation?
2. The formula for potassium nitrate is KNO3. This means .......
3. 2H2SO4 means 2 molecules of sulphuric acid. They contain .......
4. The formula for calcium hydroxide is Ca(OH)2. This means .......
5. Which of the following metals do NOT react with water or steam?
6. During a chemical reaction new substances are formed from old ones. Which of the following is NOT true?
7. Which of the following metals is the most reactive with acids?
8. When zinc carbonate reacts with dilute hydrochloric acid the products are .......
9. The formula for copper nitrate is Cu(NO3)2. This means .......
10. In the following reaction which are the products Mg + 2HCl → H2 + MgCl2?

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