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
Name
Date
Score/ 16
Question 1
Magnesium carbonate reacts with nitric acid. What are the products?
- A. magnesium nitrate + water + carbon dioxide
- B. magnesium oxide + carbon dioxide
- C. magnesium nitrate + water
- D. magnesium carbonate + water
Question 2
A self-heating can of coffee uses which kind of reaction?
- A. endothermic
- B. nuclear
- C. photosynthesis
- D. exothermic
Question 3
Is this exothermic or endothermic: respiration?
- A. exothermic
- B. endothermic
Question 4
Name the salt: copper carbonate + nitric acid → ___ + water + carbon dioxide
- A. copper nitrate
- B. copper sulfate
- C. copper oxide
- D. copper chloride
Question 5
The temperature of a reaction mixture changes from 22 °C to 39 °C. What is the temperature change? (Use a minus sign for a fall.)
Answer°C
Question 6
Calcium reacts with hydrochloric acid. What are the products?
- A. calcium chloride + carbon dioxide
- B. calcium oxide + hydrogen
- C. calcium chloride + water
- D. calcium chloride + hydrogen
Question 7
20 cm³ of an acid starts at pH 2. An alkali is added 5 cm³ at a time. The pH readings are 2, 4, 5, 7. What total volume of alkali made the solution neutral, in cm³?
Answercm³
Question 8
People take antacid tablets containing calcium carbonate for indigestion. How do they work?
- A. They kill all stomach bacteria
- B. They make food digest faster
- C. They neutralise excess stomach acid
- D. They add more acid
Question 9
What are the products when an acid neutralises an alkali?
- A. an acid and a base
- B. oxygen and water
- C. a salt and hydrogen
- D. a salt and water
Question 10
Magnesium carbonate reacts with hydrochloric acid. What are the products?
- A. magnesium chloride + water + carbon dioxide
- B. magnesium chloride + hydrogen
- C. magnesium oxide + carbon dioxide
- D. magnesium carbonate + water
Question 11
Breaking chemical bonds…
- A. has no energy change
- B. gives out energy (exothermic)
- C. takes in energy (endothermic)
- D. creates new atoms
Question 12
Is this exothermic or endothermic: photosynthesis?
- A. exothermic
- B. endothermic
Question 13
Name the salt: sodium hydroxide + nitric acid → ___ + water
- A. sodium sulfate
- B. sodium nitrate
- C. sodium oxide
- D. sodium chloride
Question 14
The temperature of a reaction mixture changes from 19 °C to 14 °C. What is the temperature change? (Use a minus sign for a fall.)
Answer°C
Question 15
Calcium reacts with hydrochloric acid. What are the products?
- A. calcium chloride + hydrogen
- B. calcium chloride + carbon dioxide
- C. calcium nitrate + hydrogen
- D. calcium sulfate + hydrogen
Question 16
20 cm³ of an acid starts at pH 1. An alkali is added 10 cm³ at a time. The pH readings are 1, 3, 4, 6, 7. What total volume of alkali made the solution neutral, in cm³?
Answercm³
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