Acids & Salts (Triple) quiz

1. In the test of a gas, a lit splint gives a squeaky pop. What is the gas?

Carbon dioxide

Oxygen

Hydrogen

Chlorine

Question 1 of 21

2. What is an alkali?

An alkali is a colourless solution

An alkali is a corrosive substance

An alkali is a source of hydroxide ions, OH⁻

An alkali is a compound that reacts with metals

Question 2 of 21

3. If nitric acid (HNO₃) produces H⁺ ions, what is formula for the other ion?

N⁻ (nitride ion)

NO₃⁻ (nitrate ion)

O²⁻ (oxide ion)

N³⁻ (nitride ion)

Question 3 of 21

4. An alkali is called a proton _________

An alkali is a proton acceptor

An alkali is a proton donor

An alkali is a proton sink

An alkali is a proton solvent

Question 4 of 21

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

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.

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) 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.

Question 5 of 21

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

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

To prevent the acid from evaporating

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

To increase the rate of reaction

Question 6 of 21

7. How are lithium ions identified, and what is the result?

Using sodium hydroxide. Precipitate is green

Using a flame test. Flame colour is red

Using a flame test. Flame colour is green

Using sodium hydroxide. Precipitate is blue

Question 7 of 21

8. Is barium chloride soluble?

slightly

no

yes

Question 8 of 21

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

Yellow

Green

Blue

Red

Question 9 of 21

10. Describe the method to prepare a pure dry sample of copper sulfate (soluble salt)

1) Heat acid in a beaker. 2) Add base 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.

1) Heat acid in a beaker. 2) Add an equal amount of base 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 acid in a beaker. 2) Add base 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) Filter and wash with distilled water. 7) Dry by leaving in a warm place.

1) Heat acid in a beaker. 2) Add an equal amount of base 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) Filter and wash with distilled water. 7) Dry by leaving in a warm place.

Question 10 of 21

11. 1.170 g of CoCl₂.xH₂O gave a residue of 0.641 g on heating. Find x.

6

7

5

3

Question 11 of 21

12. Is magnesium oxide acidic or basic?

Basic

Neutral

Acidic

Depends on the conditions

Question 12 of 21

13. What is the pH of a strong alkali?

8-10

11-14

4-7

0-3

Question 13 of 21

14. In the test for carbonate ions, what result shows they are present?

white precipitate

bubbles form

limewater goes cloudy

cream precipitate

Question 14 of 21

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

To make the colour of the flame more obvious

To clean the wire of any unwanted ions

To dissolve insoluble salts

To protect the wire from melting

Question 15 of 21

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

Combustion method

Excess solid method

Titration method

Precipitation method

Question 16 of 21

17. A pure, dry sample of an insoluble salt can be prepared starting with two soluble reactants. What is this method called?

Crystallisation method

Neutralisation method

Precipitation method

Titration method

Question 17 of 21

18. What is the test for iron (III) ions (Fe³⁺) and what is the result?

Flame test. Flame colour is red

Flame test. Flame colour is lilac

Add NaOH. A brown precipitate forms.

Add NaOH. A green precipitate forms.

Question 18 of 21

19. What is defined as a proton donor?

A base

An ore

An acid

An alkali

Question 19 of 21

20. What is a base?

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

A source of hydroxide ions, OH⁻

A compound that reacts with an acid to form hydrogen

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

Question 20 of 21

21. hydrochloric acid + sodium hydroxide →

hydrochloric acid + sodium hydroxide → sodium chloride + hydrogen

hydrochloric acid + sodium hydroxide → sodium hydrochloride + hydrogen

hydrochloric acid + sodium hydroxide → sodium hydrochloride + water

hydrochloric acid + sodium hydroxide → sodium chloride + water

Question 21 of 21

Acids & Salts (Triple) quiz

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