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Science: Middle School: Grades 6, 7 and 8 Quiz - Reactions, Equations and Formulae (Questions)

This Science quiz is called 'Reactions, Equations and Formulae' and it has been written by teachers to help you if you are studying the subject at middle school. Playing educational quizzes is a fabulous way to learn if you are in the 6th, 7th or 8th grade - aged 11 to 14.

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In this reactions, equations and formulae quiz, you will need to know the symbols for elements. Your Science teacher will have taught you that when atoms of two or more elements join together, a chemical reaction has taken place.

How will you react to the questions in this quiz all about Reactions, Equations and Formulae?

1. Which of the following metals do NOT react with water or steam?
[ ] Aluminium
[ ] Copper
[ ] Tin
[ ] Zinc
2. Which of the following metals is the most reactive with acids?
[ ] Aluminium
[ ] Iron
[ ] Magnesium
[ ] Zinc
3. The formula for potassium nitrate is KNO3. This means .......
[ ] 1 potassium atom, 1 nitrogen atom, 3 oxygen atoms
[ ] 1 potassium atom, 3 nitrogen atoms, 3 oxygen atoms
[ ] 3 potassium atoms, 3 nitrogen atoms, 3 oxygen atoms
[ ] 3 potassium atoms, 3 nitrogen atoms, 9 oxygen atoms
4. The formula for calcium hydroxide is Ca(OH)2. This means .......
[ ] 1 calcium atom, 1 oxygen atom, 2 hydrogen atoms
[ ] 1 calcium atom, 2 oxygen atoms, 1 hydrogen atom
[ ] 1 calcium atom, 2 oxygen atoms, 2 hydrogen atoms
[ ] 2 calcium atoms, 2 oxygen atoms, 2 hydrogen atoms
5. The formula for copper nitrate is Cu(NO3)2. This means .......
[ ] 1 copper atom, 1 nitrogen atom, 6 oxygen atoms
[ ] 1 copper atom, 2 nitrogen atoms, 3 oxygen atoms
[ ] 1 copper atom, 2 nitrogen atoms, 6 oxygen atoms
[ ] 2 copper atoms, 2 nitrogen atoms, 6 oxygen atoms
6. 2H2SO4 means 2 molecules of sulphuric acid. They contain .......
[ ] 2 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms
[ ] 4 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms
[ ] 4 hydrogen atoms, 2 sulfur atoms, 8 oxygen atoms
[ ] 4 hydrogen atoms, 4 sulfur atoms, 8 oxygen atoms
7. During a chemical reaction new substances are formed from old ones. Which of the following is NOT true?
[ ] New substances can be changed back to the original ones
[ ] The total mass of products = total mass of reactants
[ ] There is often a color change
[ ] There is often a temperature change
8. In the following reaction which are the products Mg + 2HCl → H2 + MgCl2?
[ ] Hydrochloric acid and magnesium chloride
[ ] Hydrogen and magnesium chloride
[ ] Magnesium and hydrochloric acid
[ ] Magnesium and hydrogen
9. Which of the following is the correct balanced equation?
[ ] 2 Cu + O2 → Cu2O2
[ ] 2 Cu + O2 → 2 CuO
[ ] Cu + O → CuO
[ ] Cu + O2 → CuO2
10. When zinc carbonate reacts with dilute hydrochloric acid the products are .......
[ ] carbon dioxide, water
[ ] zinc chloride, carbon dioxide
[ ] zinc chloride, carbon dioxide, water
[ ] zinc sulfate, carbon dioxide, water
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Science: Middle School: Grades 6, 7 and 8 Quiz - Reactions, Equations and Formulae (Answers)
1. Which of the following metals do NOT react with water or steam?
[ ] Aluminium
[x] Copper
[ ] Tin
[ ] Zinc
2. Which of the following metals is the most reactive with acids?
[ ] Aluminium
[ ] Iron
[x] Magnesium
[ ] Zinc
When a metal reacts with dilute acids hydrogen is produced
3. The formula for potassium nitrate is KNO3. This means .......
[x] 1 potassium atom, 1 nitrogen atom, 3 oxygen atoms
[ ] 1 potassium atom, 3 nitrogen atoms, 3 oxygen atoms
[ ] 3 potassium atoms, 3 nitrogen atoms, 3 oxygen atoms
[ ] 3 potassium atoms, 3 nitrogen atoms, 9 oxygen atoms
4. The formula for calcium hydroxide is Ca(OH)2. This means .......
[ ] 1 calcium atom, 1 oxygen atom, 2 hydrogen atoms
[ ] 1 calcium atom, 2 oxygen atoms, 1 hydrogen atom
[x] 1 calcium atom, 2 oxygen atoms, 2 hydrogen atoms
[ ] 2 calcium atoms, 2 oxygen atoms, 2 hydrogen atoms
Multiply everything inside the bracket by the number outside
5. The formula for copper nitrate is Cu(NO3)2. This means .......
[ ] 1 copper atom, 1 nitrogen atom, 6 oxygen atoms
[ ] 1 copper atom, 2 nitrogen atoms, 3 oxygen atoms
[x] 1 copper atom, 2 nitrogen atoms, 6 oxygen atoms
[ ] 2 copper atoms, 2 nitrogen atoms, 6 oxygen atoms
6. 2H2SO4 means 2 molecules of sulphuric acid. They contain .......
[ ] 2 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms
[ ] 4 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms
[x] 4 hydrogen atoms, 2 sulfur atoms, 8 oxygen atoms
[ ] 4 hydrogen atoms, 4 sulfur atoms, 8 oxygen atoms
7. During a chemical reaction new substances are formed from old ones. Which of the following is NOT true?
[x] New substances can be changed back to the original ones
[ ] The total mass of products = total mass of reactants
[ ] There is often a color change
[ ] There is often a temperature change
The change is not reversible under normal conditions
8. In the following reaction which are the products Mg + 2HCl → H2 + MgCl2?
[ ] Hydrochloric acid and magnesium chloride
[x] Hydrogen and magnesium chloride
[ ] Magnesium and hydrochloric acid
[ ] Magnesium and hydrogen
9. Which of the following is the correct balanced equation?
[ ] 2 Cu + O2 → Cu2O2
[x] 2 Cu + O2 → 2 CuO
[ ] Cu + O → CuO
[ ] Cu + O2 → CuO2
10. When zinc carbonate reacts with dilute hydrochloric acid the products are .......
[ ] carbon dioxide, water
[ ] zinc chloride, carbon dioxide
[x] zinc chloride, carbon dioxide, water
[ ] zinc sulfate, carbon dioxide, water
A carbonate + dilute acid always produces a salt + carbon dioxide + water
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