Lesson 5.4.2.3
5.4.2.3 Soluble salts Quiz: AQA Combined Science, Unit 11
20 questions
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Lesson 5.4.2.3, Soluble salts: 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 11: Chemical changes, written with Revision Ninja.
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The 20 questions
-
Which type of substances are reacted with acids to make soluble salts?
- Soluble liquids
- Soluble gases
- Pure metals only
- Insoluble solids
-
How is the excess solid removed when making a soluble salt?
- Chromatography
- Distillation
- Filtration
- Electrolysis
-
Why is excess solid added to acid when making a soluble salt?
- Cool the mixture
- React all acid
- Neutralise the base
- Increase reaction speed
-
How are solid salt crystals obtained from a filtered salt solution?
- By crystallisation
- By condensation
- By distillation
- By titration
-
Why is a salt solution heated before leaving it to crystallise?
- To evaporate water
- To release hydrogen
- To melt the salt
- To destroy impurities
-
What piece of equipment is used to heat dilute acid in required practical 8?
- A water bath
- An electric heater
- A delivery tube
- A Bunsen burner
-
What apparatus is used to gently evaporate a salt solution?
- A gas syringe
- A Bunsen burner
- A water bath
- A measuring cylinder
-
Which soluble salt is made by reacting copper oxide with sulfuric acid?
- Copper sulfide
- Copper(II) chloride
- Copper(II) nitrate
- Copper(II) sulfate
-
Which of these is a soluble salt?
- Barium sulfate
- Sodium chloride
- Calcium carbonate
- Lead chloride
-
When making a soluble salt, what does stopping the solid reaction indicate?
- Acid used up
- Reaction finished
- Solid used up
- Neutralisation complete
-
A student makes copper sulfate crystals from copper oxide and sulfuric acid. What colour are the crystals?
- Black
- Green
- Blue
- White
-
Which soluble salt forms when zinc carbonate reacts with nitric acid?
- Zinc chloride
- Zinc nitrate
- Zinc hydroxide
- Zinc sulfate
-
What remains after a salt solution is fully crystallised?
- Insoluble powder
- Water vapour
- Solid crystals
- Acid solution
-
Why must salt crystals be dried at the end of their preparation?
- To prevent oxidation
- To increase mass
- To remove excess water
- To stop melting
-
Which reactant is insoluble and can be added to hydrochloric acid to make a soluble salt?
- Potassium nitrate
- Lithium sulfate
- Magnesium oxide
- Sodium chloride
-
What is the theoretical mass of copper(II) sulfate (Mr 160) from 10 g of copper(II) oxide (Mr 80) with excess sulfuric acid?
- 10 g
- 20 g
- 5 g
- 40 g
-
In making a pure, dry soluble salt, what is the final step?
- Adding solid
- Filtering solution
- Drying crystals
- Evaporating water
-
Why is a water bath used to evaporate a salt solution?
- To boil quickly
- To cool solution
- To filter solid
- To heat gently
-
A student adds 2.4 g of magnesium oxide (Mr 40) to excess dilute sulfuric acid. What is the theoretical mass of magnesium sulfate (Mr 120) formed?
- 7.2 g
- 14.4 g
- 3.6 g
- 2.4 g
-
Why does copper not react directly with dilute sulfuric acid?
- Above hydrogen
- Too reactive
- Forms hydroxide
- Below hydrogen
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