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8th grade chemical reactions, acids and bases

8th grade (Year 9 in England) · 16 questions · Common Core: NGSS.MS-PS1-2, NGSS.HS-PS1-2, NGSS.MS-PS1-6, NGSS.HS-PS1-4 · England: KS3 Chemistry: Chemical reactions, KS4 Combined Science: Chemical changes, KS3 Chemistry: Energetics

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Date

Score/ 16

1
Question 1
A self-heating can of coffee uses which kind of reaction?
- A. exothermic
- B. nuclear
- C. photosynthesis
- D. endothermic
2
Question 2
A farmer's soil is too acidic. What could they add?
- A. vinegar
- B. lime (calcium hydroxide), a base
- C. sulfuric acid
- D. lemon juice
3
Question 3
Acid rain slowly damages limestone and marble statues. Why?
- A. They are made of iron
- B. They are alkali metals
- C. Rain makes them grow
- D. They are calcium carbonate, which reacts with acids
Question 4
25 cm³ of an acid starts at pH 2. An alkali is added 5 cm³ at a time. The pH readings are 2, 5, 7. What total volume of alkali made the solution neutral, in cm³?
Answercm³
Question 5
The temperature of a reaction mixture changes from 20 °C to 42 °C. What is the temperature change? (Use a minus sign for a fall.)
Answer°C
6
Question 6
Name the salt: potassium hydroxide + sulfuric acid → ___ + water
- A. potassium oxide
- B. potassium nitrate
- C. potassium chloride
- D. potassium sulfate
7
Question 7
Sodium carbonate reacts with sulfuric acid. What are the products?
- A. sodium sulfate + water
- B. sodium oxide + carbon dioxide
- C. sodium carbonate + water
- D. sodium sulfate + water + carbon dioxide
8
Question 8
Magnesium reacts with sulfuric acid. What are the products?
- A. magnesium oxide + hydrogen
- B. magnesium sulfate + carbon dioxide
- C. magnesium nitrate + hydrogen
- D. magnesium sulfate + hydrogen
9
Question 9
Is this exothermic or endothermic: neutralising an acid with an alkali?
- A. exothermic
- B. endothermic
10
Question 10
In an exothermic reaction, the energy of the products is…
- A. exactly the same as the reactants
- B. zero
- C. lower than the energy of the reactants
- D. higher than the energy of the reactants
11
Question 11
Which gas is produced when a carbonate reacts with an acid?
- A. nitrogen
- B. carbon dioxide
- C. oxygen
- D. hydrogen
12
Question 12
Acid rain slowly damages limestone and marble statues. Why?
- A. They are alkali metals
- B. They are calcium carbonate, which reacts with acids
- C. Rain makes them grow
- D. They are made of iron
Question 13
10 cm³ of an acid starts at pH 2. An alkali is added 5 cm³ at a time. The pH readings are 2, 5, 7. What total volume of alkali made the solution neutral, in cm³?
Answercm³
Question 14
The temperature of a reaction mixture changes from 18 °C to 24 °C. What is the temperature change? (Use a minus sign for a fall.)
Answer°C
15
Question 15
Name the salt: zinc + nitric acid → ___ + hydrogen
- A. zinc nitrate
- B. zinc sulfate
- C. zinc oxide
- D. zinc chloride
16
Question 16
Magnesium carbonate reacts with sulfuric acid. What are the products?
- A. magnesium sulfate + water
- B. magnesium sulfate + hydrogen
- C. magnesium sulfate + water + carbon dioxide
- D. magnesium carbonate + water

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