ks4 / edexcel 360 science / c1a making changes / test 11_12 part b answers

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Part B

Surname Signature

Name

American Academy Larnaca

Year 5 TestScience

Chemistry

Topic C1a.6 Making changes

Tuesday 11 October 2011Time: 20 minutes



Part B

Preparing calcium chloride

Use the following information to answer questions 17 to 19.

Excess calcium carbonate reacts with dilute hydrochloric acid to form a solution of the salt calcium

chloride.

The word equation for the reaction is

calcium carbonate + hydrochloric acid → calcium chloride + carbon dioxide + water

17. What will be observed during this reaction?

A a very bad smell

B a change in colour

C bubbles of gas

D a solid precipitate forming

18. During this reaction the dilute hydrochloric acid is

A evaporated

B thermally decomposed

C reduced

D neutralised

19. Heat is given out during the reaction.

This shows that the reaction

A is exothermic

B is endothermicC could be exothermic or endothermic

D is neither exothermic nor endothermic

20. The test for carbon dioxide is that it

A relights a glowing splint

B turns universal indicator blue

C turns limewater milky

D burns when a lighted splint is applied

21. Anhydrous calcium chloride can be used to dry gases.The water is removed when the anhydrous calcium chloride reacts with it.

This reaction is an example of

A neutralisation

B reduction

C hydration

D hydrogenation



Part B

22. The formula of hydrochloric acid is

A HCL

B Hcl

C HCl2

D HCl

23. Potassium bromide is a soluble salt.

Which of these processes must be used to form a sample of solid potassium bromide from a

solution of the salt?

A hydration

B evaporation

C condensation

D filtration

Firework display

24. The magnesium burns in air to form a white ash.

Which row of the table correctly identifies the ash and the chemical change the magnesium

undergoes?



Part B

25. The word equation for the action of heat on the potassium nitrate in the firework is

potassium nitrate → potassium nitrite + oxygen

This change is

A thermal decompositionB hydration

C neutralisation

D dehydration

Hazardous chemicals

26. A cylinder of chlorine gas is labelled with these two hazard symbols.

Which row of the table is correct?

Salts

27. Lead nitrate solution is reacted with potassium iodide solution.

A precipitate of lead iodide is formed.

A pure, dry sample of the lead iodide could be obtained from the reaction mixture by

A evaporating

B filtering, then drying

C filtering, then washing, then drying

D washing, then filtering, then drying



Part B

28. KNO3 is the formula of a salt.

The name of this salt is

A potassium nitride

B potassium nitrogen oxide

C potassium nitrate

D potassium nitro-oxide

29. The balanced equation for the reaction of calcium carbonate with hydrochloric acid is

A CaCO3 + HCl → CaCl + H2O + CO2

B CaCO3 + HCl2 → CaCl2 + H2O + CO2

C CaCO3 + 2HCl → CaCl2 + H2O + CO2

D CaCO3 + H2Cl → CaCl + H2O + CO2

Salt preparations

Use the following information to answer questions 30 and 31.

Copper sulphate can be prepared by reacting excess copper oxide with warm dilute sulphuric acid.

30. What should be observed during the reaction?

A the liquid turning blue

B a white suspension

C bubbles of gas

D a brown solid forming

31. Which of these statements about this preparation are correct?

1 The reaction taking place is oxidation

2 Pure copper sulphate can be obtained by evaporation of the mixture of copper

oxide and copper sulphate solution

A 1 only

B 2 only

C both 1 and 2

D neither 1 nor 2

32. Copper oxide reacts with warm dilute hydrochloric acid to form copper chloride.

The correct balanced equation for the reaction is

A 2CuO + 2HCl → 2CuCl + H2 + O2

B CuO + H2Cl → CuCl + H2O

C CuO + 2HCl → CuCl2 + H2O

D 2CuO + 2HCl → Cu2Cl2 + H2O



Part B

33. Potassium chlorate is a salt.

Its formula could be

A KCl

B K2O

C K2CO3

D KClO

Baking with flour

34. Flour is used in baking. It contains carbohydrates.

Carbohydrates in flour

A are artificial additives

B are only present in small amounts

C provide the body with fibre

D provide the body with energy

35. By law, flour manufacturers must add calcium carbonate (additive E170) to all flour produced

in the United Kingdom.

The most likely reason for this is that calcium carbonate

A makes the flour keep better

B improves the colour of the flour

C provides calcium for healthy bones

D improves the taste



Part B

36. In baking, the formation of carbon dioxide makes cakes rise.

The carbon dioxide is formed from

A phosphoric acid

B carbohydrates

C sodium carbonate

D sodium hydrogencarbonate

37. Which row of the table shows other uses of carbon dioxide?

Indigestion tablets

Indigestion tablets react with hydrochloric acid in the stomach.

Many types of indigestion tablets contain magnesium hydroxide.

Sara gradually added magnesium hydroxide powder to some warm,

dilute hydrochloric acid until excess magnesium hydroxide was

present.

38. Sara would observe

A the mixture finally turning blue

B bubbles

C the mixture finally turning cloudy

D a pungent gas

39. The term ‘excess’ means

A more than enough to react

B readily available

C a precipitate is formedD not all of the acid reacts



Part B

40. The chemical equation for the reaction of magnesium hydroxide with hydrochloric acid can be represented

by

wMg(OH)2 + xHCl → yMgCl2 + zH2O

Which row shows values of w, x, y and z that give a balanced equation?

ks4 / edexcel 360 science / c1a making changes / test 11_12 part b answers

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