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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Question 1
Magnesium reacts with nitric acid. What are the products?
- A. magnesium nitrate + hydrogen
- B. magnesium oxide + hydrogen
- C. magnesium chloride + hydrogen
- D. magnesium nitrate + water
Question 2
How could you prove that the gas from magnesium and acid is hydrogen?
- A. it relights a glowing splint
- B. it turns limewater cloudy
- C. it bleaches damp litmus
- D. a lighted splint gives a squeaky pop
Question 3
Magnesium carbonate reacts with nitric acid. What are the products?
- A. magnesium nitrate + water
- B. magnesium nitrate + hydrogen
- C. magnesium carbonate + water
- D. magnesium nitrate + water + carbon dioxide
Question 4
10 cm³ of an acid starts at pH 2. An alkali is added 10 cm³ at a time. The pH readings are 2, 3, 5, 6, 7. What total volume of alkali made the solution neutral, in cm³?
Answercm³
Question 5
What is activation energy?
- A. the energy in a battery
- B. the energy of light
- C. the energy given out by a reaction
- D. the minimum energy particles need to react when they collide
Question 6
What are the products when an acid neutralises an alkali?
- A. an acid and a base
- B. a salt and hydrogen
- C. a salt and water
- D. oxygen and water
Question 7
The temperature of a reaction mixture changes from 21 °C to 24 °C. What is the temperature change? (Use a minus sign for a fall.)
Answer°C
Question 8
Name the salt: potassium hydroxide + nitric acid → ___ + water
- A. potassium nitrate
- B. potassium oxide
- C. potassium sulfate
- D. potassium chloride
Question 9
Is this exothermic or endothermic: magnesium reacting with acid?
- A. exothermic
- B. endothermic
Question 10
Calcium reacts with hydrochloric acid. What are the products?
- A. calcium chloride + water
- B. calcium chloride + carbon dioxide
- C. calcium oxide + hydrogen
- D. calcium chloride + hydrogen
Question 11
People take antacid tablets containing calcium carbonate for indigestion. How do they work?
- A. They kill all stomach bacteria
- B. They add more acid
- C. They make food digest faster
- D. They neutralise excess stomach acid
Question 12
Copper carbonate reacts with sulfuric acid. What are the products?
- A. copper sulfate + hydrogen
- B. copper sulfate + water + carbon dioxide
- C. copper oxide + carbon dioxide
- D. copper carbonate + water
Question 13
10 cm³ of an acid starts at pH 1. An alkali is added 10 cm³ at a time. The pH readings are 1, 3, 5, 7. What total volume of alkali made the solution neutral, in cm³?
Answercm³
Question 14
Breaking chemical bonds…
- A. has no energy change
- B. creates new atoms
- C. takes in energy (endothermic)
- D. gives out energy (exothermic)
Question 15
Which gas is produced when a metal reacts with an acid?
- A. oxygen
- B. hydrogen
- C. chlorine
- D. carbon dioxide
Question 16
The temperature of a reaction mixture changes from 21 °C to 26 °C. What is the temperature change? (Use a minus sign for a fall.)
Answer°C
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