Matthew T
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Twenty questions on the fourth section of Unit 3 in AQA GCSE Chemistry: Analysis and synthesis.

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Matthew T
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AQA GCSE Chemistry Unit 3.4

AQA GCSE Chemistry Unit 3.4

Question 1 of 20

1

What ion is present if a lilac flame is produced in a flame test?

Select one of the following:

  • Lithium Li+

  • Sodium Na+

  • Potassium K+

  • Calcium Ca2+

  • Barium Ba2+

Explanation

Question 2 of 20

1

What ion is present if a blue precipitate is formed in the presence of sodium hydroxide?

Select one of the following:

  • Iron (II) Fe2+

  • Iron (III) Fe3+

  • Copper Cu2+

  • Barium Ba2+

  • Magnesium Mg2+

Explanation

Question 3 of 20

1

What ion is present if a white precipitate is formed in the presence of sodium hydroxide which dissolves in excess sodium hydroxide?

Select one of the following:

  • Sodium Na+

  • Iron (III) Fe3+

  • Aluminium Al3+

  • Calcium Ca2+

  • Magnesium Mg2+

Explanation

Question 4 of 20

1

Which test is used for detecting carbonate ions?

Select one of the following:

  • Adding dilute nitric acid then silver nitrate

  • Adding dilute hydrochloric acid and bubbling the gas through limewater

  • Adding dilute hydrochloric acid then barium chloride

Explanation

Question 5 of 20

1

Which test is used for detecting halide ions?

Select one of the following:

  • Adding dilute nitric acid then silver nitrate

  • Adding dilute hydrochloric acid and bubbling the gas through limewater

  • Adding dilute hydrochloric acid then barium chloride

Explanation

Question 6 of 20

1

Which test is used for detecting sulphate ions?

Select one of the following:

  • Adding dilute nitric acid then silver nitrate

  • Adding dilute hydrochloric acid and bubbling the gas through limewater

  • Adding dilute hydrochloric acid then barium chloride

Explanation

Question 7 of 20

1

What would you use a pipette for in an acid-alkali titration?

Select one of the following:

  • Measuring out a fixed volume of alkali

  • Measuring the volume of acid added

Explanation

Question 8 of 20

1

What would you use a burette for in an acid-alkali titration?

Select one of the following:

  • Measuring out a fixed volume of alkali

  • Measuring the volume of acid added

Explanation

Question 9 of 20

1

How many cm^3 make up 1 dm^3?

Select one of the following:

  • 10

  • 100

  • 1000

Explanation

Question 10 of 20

1

True or false? When calculating the concentration of a substance in a titration, you have to divide the number of moles used by the volume of the solution.

Select one of the following:

  • True
  • False

Explanation

Question 11 of 20

1

True or false? The sodium hydroxide test is a type of quantitative chemical test.

Select one of the following:

  • True
  • False

Explanation

Question 12 of 20

1

What test is carried out to analyse DNA?

Select one of the following:

  • Silver nitrate test

  • Titration

  • Gel electrophoresis

Explanation

Question 13 of 20

1

What is dynamic equilibrium?

Select one of the following:

  • The point at which the reversible reaction stops

  • The point at which the rate of forward reaction is equal to the rate of backward reaction

  • The point at which a see-saw is balanced

Explanation

Question 14 of 20

1

True or false? If you increase the concentration of a reactant, more of the products will be formed in a reversible reaction.

Select one of the following:

  • True
  • False

Explanation

Question 15 of 20

1

If the forward reaction produces more molecules of gas than the backward reaction, what should you do to maximise the yield of products?

Select one of the following:

  • Increase the pressure

  • Decrease the pressure

Explanation

Question 16 of 20

1

If the forward reaction is endothermic, what should you do in order to maximise the yield of products?

Select one of the following:

  • Increase the temperature

  • Decrease the temperature

Explanation

Question 17 of 20

1

Which process is used to make ammonia?

Select one of the following:

  • Bessemer process

  • Contact process

  • Haber-Bosch process

Explanation

Question 18 of 20

1

True or false? Unreacted gases in the Haber-Bosch process are not recycled.

Select one of the following:

  • True
  • False

Explanation

Question 19 of 20

1

True or false? The pressure in the Haber-Bosch process is 200atm because, although high pressure increases yield, it becomes increasingly difficult to find suitable storage containers.

Select one of the following:

  • True
  • False

Explanation

Question 20 of 20

1

True or false? The temperature of the Haber-Bosch process is 450°C because, although the reaction is exothermic and needs a lower temperature to maximise yield, too low temperatures stop the iron catalyst from working properly.

Select one of the following:

  • True
  • False

Explanation

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