GCSE Chemistry – Equations

Last updated: 13/04/2020

AQA GCSE Science – Chemistry foundation Atomic structure and the periodic table GCSE Chemistry – Equations

Learning Objectives

-I can represent a reaction using a word equation
-I can represent a reaction using a balanced symbol equation

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Question 1 of 25

1. Question
What is the definition of a reactant?
- The substances you start with
- The new substances made
- The solid substances
- The aqueous substances
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Question 2 of 25

2. Question
What is the definition of a product?
- The new substances made
- The substances you start with
- The solid substances
- The aqueous substances
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Question 3 of 25

3. Question
What is the definition of an aqueous substance?
- A substance dissolved in water
- A substance dissolved in a solvent
- A substance dissolved in an acid
- A precipitate
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Question 4 of 25

4. Question
What is the state symbol for a solid?
- s
- l
- aq
- g
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Question 5 of 25

5. Question
What is the state symbol for a liquid?
- l
- s
- aq
- g
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Question 6 of 25

6. Question
What is the state symbol for a gas?
- g
- s
- aq
- l
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Question 7 of 25

7. Question
What is the state symbol for an aqueous substance?
- aq
- s
- g
- l
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Question 8 of 25

8. Question
Write the word equation for the formation of carbon dioxide.
- Carbon + oxygen -> carbon dioxide
- Carbon + hydrogen -> carbon dioxide
- Carbon + oxygen -> carbon oxide
- Oxygen + hydrogen -> carbon dioxide
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Question 9 of 25

9. Question
Write the word equation for the formation of ammonia.
- Nitrogen + hydrogen -> ammonia
- Carbon + nitrogen -> ammonia
- Nitrogen + oxygen -> ammonia
- Hydrogen + oxygen -> ammonia
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Question 10 of 25

10. Question
Write the word equation for the formation of potassium oxide.
- Potassium + oxygen -> potassium oxide
- Potassium -> potassium oxide
- Oxygen -> potassium oxide
- Potassium + hydrogen -> potassium oxide
Correct

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Question 11 of 25

11. Question
Write the word equation for the formation of sodium oxide.
- Sodium + oxygen -> sodium oxide
- Sodium -> sodium oxide
- Oxygen -> sodium oxide
- Sodium + carbon -> sodium oxide
Correct

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Question 12 of 25

12. Question
Write the word equation for the formation of sodium hydroxide.
- Sodium + water -> sodium hydroxide
- Sodium + hydrogen -> sodium hydroxide
- Sodium + oxygen -> sodium hydroxide
- Sodium + water -> sodium oxide
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Question 13 of 25

13. Question
Write the word equation for the formation of water.
- Hydrogen + oxygen -> water
- Hydrogen + carbon -> water
- Carbon + oxygen -> water
- Oxygen -> water
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Question 14 of 25

14. Question
Write the word equation for the formation of lithium oxide.
- Lithium + oxygen -> lithium oxide
- Lithium + oxygen -> oxide
- Lithium + oxygen -> lithium
- Lithium + hydrogen -> lithium oxide
Correct

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Question 15 of 25

15. Question
Write the word equation for the decomposition of calcium carbonate.
- Calcium carbonate -> calcium oxide + carbon dioxide
- Calcium carbonate -> calcium oxide
- Calcium carbonate -> calcium oxide + oxygen
- Calcium carbonate -> calcium + carbon dioxide
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Question 16 of 25

16. Question
Write the word equation for the formation of hydrochloric acid.
- Hydrogen + chlorine -> hydrochloric acid
- Hydrogen -> hydrochloric acid
- Oxygen + chlorine -> hydrochloric acid
- Chlorine -> hydrochloric acid
Correct

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Question 17 of 25

17. Question
Write the word equation for the formation of calcium oxide.
- Calcium + oxygen -> calcium oxide
- Calcium -> calcium oxide
- Oxygen -> calcium oxide
- Calcium + oxygen -> calcium
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Question 18 of 25

18. Question
Write the word equation for the formation of iron oxide.
- Iron + oxygen -> iron oxide
- Oxygen -> iron oxide
- Iron -> iron oxide
- Iron + oxygen -> iron
Correct

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Question 19 of 25

19. Question
Write the word equation for the formation of hydrogen bromide.
- Hydrogen + bromine -> hydrogen bromide
- Hydrogen -> hydrogen bromide
- Oxygen + bromine -> hydrogen bromide
- Bromine -> hydrogen bromide
Correct

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Question 20 of 25

20. Question
Write the word equation for the formation of magnesium oxide.
- Magnesium + oxygen -> magnesium oxide
- Magnesium -> magnesium oxide
- Oxygen -> magnesium oxide
- Magnesium + hydrogen -> magnesium oxide
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Question 21 of 25

21. Question
Balance the following equation: H $_2$ + O $_2$ -> H $_2$ O
- $2H_2 + O_2 -> H_2O$
- $H_2 + 2O_2 -> 2H_2O$
- $H_2 + O_2 -> 2H_2O$
- $H_2 + 2O_2 -> H_2O$
Correct

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Question 22 of 25

22. Question
Balance the following equation: CaCO $_3$ -> CaO + CO $_2$
- $CaCO_3 -> CaO + CO_2$
- $CaCO_3 -> CaO + 2CO_2$
- $2CaCO_3 -> CaO + CO_2$
- $CaCO_3 -> 2CaO + CO_2$
Correct

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Question 23 of 25

23. Question
Balance the following equation: MgCO $_3$ -> CaO + CO $_2$
- $MgCO_3 -> MgO + CO_2$
- $MgCO_3 -> MgO + 2CO_2$
- $2MgCO_3 -> MgO + CO_2$
- $MgCO_3 -> 2MgO + CO_2$
Correct

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Question 24 of 25

24. Question
Balance the following equation: H $_2$ + Cl $_2$ -> HCl
- $H_2 + Cl_2 -> 2HCl$
- $2H_2 + Cl_2 -> HCl$
- $H_2 + 2Cl_2 -> HCl$
- $H_2 + Cl_2 -> HCl$
Correct

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Question 25 of 25

25. Question
Balance the following equation: H $_2$ + Br $_2$ -> HBr
- $H_2 + Br_2 -> 2HBr$
- $2H_2 + Br_2 -> HBr$
- $H_2 + 2Br_2 -> HBr$
- $H_2 + Br_2 -> HBr$
Correct

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