Acids & Salts (Triple) quiz

1. Which gas will turn damp red litmus paper blue?

Carbon dioxide

Hydrogen

Ammonia

Chlorine

Question 1 of 21

2. What is a base?

A source of hydroxide ions, OH⁻

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

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

A compound that reacts with an acid to form hydrogen

Question 2 of 21

3. When testing a sample for ions, nitric acid is added to a sample and then bubbles are seen. What ions have been shown to be present?

chloride ions (Cl⁻)

carbonate ions (CO₃²⁻)

sulfate ions (SO₄²⁻)

bromide ions (Br⁻)

Question 3 of 21

4. Give the name of the blue precipitate formed when sodium hydroxide is added to a solution containing Cu²⁺

copper (III) oxide

copper (III) hydroxide

copper (II) oxide

copper (II) hydroxide

Question 4 of 21

5. 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 5 of 21

6. What is an acid?

An acid is a green solution

An acid is a source of hydrogen ions, H⁺

An acid is a corrosive substance

An acid is a compound that reacts with metals

Question 6 of 21

7. State the steps for calculating empirical 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

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

Question 7 of 21

8. Describe how you would carry out a flame test

Put solid onto a wire. Put into an orange flame

Put solid onto a wire. Put into a blue flame

Dissolve solid in acid. Put solution onto wire. Put into an orange flame

Dissolve solid in acid. Put solution onto wire. Put into an blue flame

Question 8 of 21

9. Is ammonium carbonate soluble?

yes

no

slightly

Question 9 of 21

10. If ammonium nitrate NH₄NO₃ contains the NO₃⁻ ion, what is the formula for the other ion?

H⁺

N³⁻

NH₄⁻

NH₄⁺

Question 10 of 21

11. What is defined as a proton donor?

An ore

An acid

A base

An alkali

Question 11 of 21

12. 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 filtration

Neutralisation then precipitation

Combustion then crystallisation

Titration then crystallisation

Question 12 of 21

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

Combustion method

Titration method

Precipitation method

Excess solid method

Question 13 of 21

14. An acid is called a proton _________

An acid is a proton acceptor

An acid is a proton donor

An acid is a proton sink

An acid is a proton solvent

Question 14 of 21

15. 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) Pour away the liquid 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 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.

Question 15 of 21

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

K⁺

Li⁺

Cu²⁺

Na⁺

Question 16 of 21

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

7 (neutral)

12-14

0-3

8-10

Question 17 of 21

18. Give the formula of sulfuric acid

HS

H₂S

HSO₄

H₂SO₄

Question 18 of 21

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

Green

Red

Blue

Yellow

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

Excess solid method

Titration method

Precipitation method

Question 20 of 21

21. What is an alkali compared to a base?

Alkalis are bases that are soluble in water

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

Alkalis have higher pHs than bases

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

Question 21 of 21

Acids & Salts (Triple) quiz

Acids & Salts (Triple) quiz

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