Acids & Salts (Triple) quiz

1. What is a base?

A source of hydroxide ions, OH⁻

A substance which can neutralise an acid, forming salt and water only

An unreactive form of an alkali that is used to store it

A compound that reacts with an acid to form hydrogen

Question 1 of 21

2. When NaOH is added to a sample, a brown precipitate forms. What cation was present in the sample?

Iron (II), Fe²⁺

Iron (III), Fe³⁺

Potassium (I), K⁺

Calcium (II), Ca²⁺

Question 2 of 21

3. When preparing hydrated copper(II) sulfate crystals starting from copper(II) oxide, why is the acid gently heated?

To increase the concentration of the acid

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

To speed up the reaction

To boil the acid

Question 3 of 21

4. In a flame test, a yellow colour is seen. Give the formula of the cation which is present.

Ca²⁺

K⁺

Li⁺

Na⁺

Question 4 of 21

5. What is an alkali?

An alkali is a corrosive substance

An alkali is a colourless solution

An alkali is a source of hydroxide ions, OH⁻

An alkali is a compound that reacts with metals

Question 5 of 21

6. hydrochloric acid + sodium hydroxide →

hydrochloric acid + sodium hydroxide → sodium chloride + hydrogen

hydrochloric acid + sodium hydroxide → sodium hydrochloride + water

hydrochloric acid + sodium hydroxide → sodium chloride + water

hydrochloric acid + sodium hydroxide → sodium hydrochloride + hydrogen

Question 6 of 21

7. What is the universal indicator colour of a strongly acid solution?

Blue

Red

Green

Yellow

Question 7 of 21

8. A pure, dry sample of a soluble salt can be prepared starting from an acid and alkali. What are the two stages of this method called?

Neutralisation then precipitation

Titration then crystallisation

Neutralisation then filtration

Combustion then crystallisation

Question 8 of 21

9. Is calcium sulfate soluble?

no

yes

slightly

Question 9 of 21

10. What is defined as a proton donor?

An acid

A base

An alkali

An ore

Question 10 of 21

11. An alkali is called a proton _________

An alkali is a proton solvent

An alkali is a proton donor

An alkali is a proton sink

An alkali is a proton acceptor

Question 11 of 21

12. 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) 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) 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) 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) Pour away the liquid 4) Wash with one of the original solutions. 5) Dry by leaving in a warm place.

Question 12 of 21

13. State the formula of the nitrate ion

N³⁻

NO₃⁺

NO₃⁻

NO₂⁻

Question 13 of 21

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

7 (neutral)

8-10

12-14

0-3

Question 14 of 21

15. State the steps for calculating empirical formula

1) Aᵣ/mass. 2) divide by the largest. 3) Give the ratio has a whole number. 4) State final empirial formula

1) Aᵣ/mass. 2) divide by the smallest. 3) Give the ratio has a whole number. 4) State final empirial formula

1) mass/Aᵣ. 2) divide by the largest. 3) Give the ratio has a whole number. 4) State final empirial formula

1) mass/Aᵣ. 2) divide by the smallest. 3) Give the ratio has a whole number. 4) State final empirial formula

Question 15 of 21

16. What is an alkali compared to a base?

Alkalis have higher pHs than bases

Both alkalis and bases have pH greater than 7 but only alkalis are corrosive

Alkalis are anything with a pH above 7. Bases are only metal oxides

Alkalis are bases that are soluble in water

Question 16 of 21

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

Yellow precipitate

Cream precipitate

White precipitate

Blue precipitate

Question 17 of 21

18. Describe the test for oxygen gas

Turns moist litmus paper white (bleaches)

Use a glowing splint and see if it relights

Use a lit splint to see if the gas pops

Bubble the gas through limewater and see if it goes cloudy

Question 18 of 21

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

Precipitation method

Combustion method

Titration method

Excess solid method

Question 19 of 21

20. 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 20 of 21

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

To make the colour of the flame more obvious

To protect the wire from melting

To clean the wire of any unwanted ions

To dissolve insoluble salts

Question 21 of 21

Acids & Salts (Triple) quiz

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