Acids & Salts (Triple) quiz

1. An acid is called a proton _________

An acid is a proton donor

An acid is a proton sink

An acid is a proton acceptor

An acid is a proton solvent

Question 1 of 21

2. If iron oxide has the formula Fe₂O₃, what is the name and formula of the iron ion?

iron (II) ion Fe³⁺

iron (III) ion: Fe²⁺

iron (II) ion: Fe²⁺

iron (III) ion: Fe³⁺

Question 2 of 21

3. Is silver hydroxide soluble?

slightly

yes

no

Question 3 of 21

4. With universal indicator, what is the pH of a green solution?

0-3

12-14

7 (neutral)

8-10

Question 4 of 21

5. Is magnesium oxide acidic or basic?

Depends on the conditions

Basic

Neutral

Acidic

Question 5 of 21

6. In a flame test, why is hydrochloric acid used?

To protect the wire from melting

To clean the wire of any unwanted ions

To dissolve insoluble salts

To make the colour of the flame more obvious

Question 6 of 21

7. What method would be followed to prepare a sample of pure, dry lead (II) sulfate?

Titration method

Excess solid method

Combustion method

Precipitation method

Question 7 of 21

8. What is the empirical formula of a compound in which 0.48 g of carbon combines with 0.08 g of hydrogen and 0.64 g of oxygen?

CH₂O

C₂H₄O₂

C₄H₂O

CH₄O

Question 8 of 21

9. In the flame test for copper (II) ions what colour is the result?

Yellow

Red

Lilac

Blue-green

Question 9 of 21

10. When preparing hydrated copper(II) sulfate crystals starting from copper(II) oxide, why is an excess of copper (II) oxide added?

To ensure all the acid has reacted so there is no acid left

To increase the rate of reaction

To ensure there is enough solid left for the impurities to be filtered out

To prevent the acid from evaporating

Question 10 of 21

11. What is the universal indicator colour of a pH 8-10 solution?

Yellow

Green

Blue

Red

Question 11 of 21

12. Nitric acid and silver nitrate are added to a solution containing bromide ions. Describe the result.

Blue precipitate

Yellow precipitate

Cream precipitate

White precipitate

Question 12 of 21

13. Describe the method to prepare a pure dry sample of sodium chloride (soluble salt)

1) Pipette 25cm³ of sodium hydroxide into a conical flask. 2) Add indicator. 3) (Using titration values)Titrate the known volume hydrochloric acid into conical flask containing alkali. 4) Transfer to an evaporating basin. 5) Heat the solution until a hot saturated solution forms. 6) Allow the solution to cool so that hydrated crystals form. 7) Remove the crystals by filtration and wash with distilled water. 8) Dry by leaving in a warm place.

1) Pipette 25cm³ of sodium hydroxide into a conical flask. 2) Do not add indicator. 3) (Using titration values)Titrate the known volume hydrochloric acid into conical flask containing alkali. 4) Transfer to an evaporating basin. 5) Heat the solution until a hot saturated solution forms. 6) Allow the solution to cool so that hydrated crystals form. 7) Remove the crystals by filtration and wash with distilled water. 8) Dry by leaving in a warm place.

1) Heat hydrochloric acid in a beaker. 2) Add an equal amount of sodium oxide and stir with glass rod. 3) Filter the mixture using filter paper and funnel. 4) Heat the filtered solution (filtrate) until a hot saturated solution forms. 5) Allow the solution to cool so that hydrated crystals form. 6) Remove the crystals by filtration and wash with distilled water. 7) Dry by leaving in a warm place.

1) Heat hydrochloric acid in a beaker. 2) Add sodium oxide until excess and stir with glass rod. 3) Filter the mixture using filter paper and funnel. 4) Heat the filtered solution (filtrate) until a hot saturated solution forms. 5) Allow the solution to cool so that hydrated crystals form. 6) Remove the crystals by filtration and wash with distilled water. 7) Dry by leaving in a warm place.

Question 13 of 21

14. Describe the test for ammonia gas

Turns damp red litmus paper blue

Burns with a squeaky pop

Relights a glowing splint

Turns limewater cloudy

Question 14 of 21

15. What is an acid?

An acid is a source of hydrogen ions, H⁺

An acid is a green solution

An acid is a compound that reacts with metals

An acid is a corrosive substance

Question 15 of 21

16. Describe an experiment to prepare a pure, dry sample of an insoluble salt, starting from two soluble reactants

1) Mix the two salt solutions together in a beaker. 2) Stir with glass rod. 3) Pour away the liquid 4) Wash with distilled water. 5) Dry by leaving in a warm place.

1) Mix the two salt solutions together in a beaker. 2) Stir with glass rod. 3) Filter using filter paper and funnel. 4) Wash with distilled water. 5) Dry by leaving in a warm place.

1) Mix the two salt solutions together in a beaker. 2) Stir with glass rod. 3) Filter using filter paper and funnel 4) Wash with one of the original solutions. 5) Dry by leaving in a warm place.

1) Mix the two salt solutions together in a beaker. 2) Stir with glass rod. 3) Pour away the liquid 4) Wash with one of the original solutions. 5) Dry by leaving in a warm place.

Question 16 of 21

17. Can a base neutralise an acid?

Yes

No

Sometimes

Only if it is more reactive than hydrogen

Question 17 of 21

18. What is defined as a proton donor?

An alkali

An acid

An ore

A base

Question 18 of 21

19. How would you test for the ammonium ion (NH₄⁺)?

Gently heat it. If ammonium ions were present, ammonia gas will be given off which will turn damp red litmus paper blue

Add sodium hydroxide. If ammonium ions were present, ammonia gas will form which will bleach damp red litmus paper

Add sodium hydroxide. If ammonium ions were present, ammonia gas will form which will turn damp red litmus paper blue

Gently heat it. If ammonium ions were present, ammonia gas will be given off which will bleach damp red litmus paper

Question 19 of 21

20. sulfuric acid + copper oxide →

sulfuric acid + copper oxide → copper sulfate + carbon dioxide

sulfuric acid + copper oxide → copper sulfate + water

sulfuric acid + copper oxide → copper sulfide + water

sulfuric acid + copper oxide → copper sulfide + hydrogen

Question 20 of 21

21. A pure, dry sample of a soluble salt can be prepared starting with an insoluble reactant. What is this method called?

Combustion method

Precipitation method

Titration method

Excess solid method

Question 21 of 21

Acids & Salts (Triple) quiz

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