General LevelPart A

Circle the correct response(s)

1. The grid shows the names of six soluble substances.

Asodium oxide

Bpotassium nitrate

Cnitrogen dioxide

Dsulphur dioxide

Esodium chloride

Fcalcium oxide

(a) Which two boxes show a substance that would give an acid solution?

A B C

D E F

(b) Which two boxes show a substance that would give a solution of pH 7?

A B C

D E F

(c) Which box shows a substance produced when coal is burned?

A B C

D E F

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2. The grid below shows the names of some gases that can be formed in chemical reactions.

Aoxygen

Bcarbon

monoxide

Chydrogen

Dcarbon dioxide

Echlorine

Fnitrogen

Which box in the grid shows the name of a gas which:

(a) is formed when an acid reacts with a metal carbonate?

A B C

D E F

(b) is formed at the positive electrode when hydrochloric acid is electrolysed?

A B C

D E F

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3. The grid shows the names of some salts.

Asilver

sulphate

Bbarium

carbonate

Cpotassium

nitrate

Dsodium bromide

Elead

iodide

Fbarium chloride

(a) Which two boxes show the name of an insoluble salt?(You may wish to use page 5 of the data booklet to help you)

A B C

D E F

(b) Which box shows the name of a salt formed from nitric acid?

A B C

D E F

(c) Which box shows a substance which will react with acid to produce a gas?

A B C

D E F

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Part BWrite your answers in the spaces provided.

1. Alkalis in the Home

Toothpaste is mildly alkaline. It neutralises the acids which attack teeth. These acids are formed when bacteria in saliva act on sugars in food. Ammonia is commonly added to household cleaners to remove oily, greasy dirt. More powerful cleaners contain sodium hydroxide. Tough deposits of grease in an oven may be removed with special cleaners based on potassium hydroxide.

Construct a table to show the common uses of alkalis.

(2)

2. Acids are very useful chemicals. However, too much acid in the wrong place can cause many problems.

(a) Give two examples of environmental problems caused by acid rain.

1

2 2

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2. (continued)(b) (i) Give an example of how too much acid can be a problem

in the body.

1

(ii) What can be taken to remedy this?

1

(4)

3. An indicator is a substance which changes colour in an acid or an alkali. The table gives information about three common indicators.

Indicator Colour in Acid

Colour in Alkali

litmus red bluephenolphthalein colourless redmethyl orange red yellow

(a) What colour would you see if:

(i) litmus was added to 1mol/l hydrochloric acid?

1

(ii) methyl orange was added to the alkali, 1mol/l sodium hydroxide?

1

(b) A few drops of phenolphthalein are added to 5cm3 of 1mol/l sodium hydroxide in a test tube. 1mol/l hydrochloric acid is then added drop by drop until the solution becomes acidic.

What colour change would you expect?

1

(3)

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4. Jodie added lumps of marble (calcium carbonate) to hydrochloric acid in a test tube.

Every 2 minutes she noted the volume of gas given off.

Time (mins)

Total volume of gas (cm3)

0 0 2 404 656 808 9510 10012 100

(a) Draw a line graph of volume of gas (y-axis) against time (x-axis).

2

(b) Write a word equation for the reaction taking place.

_______________________________________________ 1 (3)

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Credit LevelPart A

Circle the correct response(s)

1. The grid shows something about the H+(aq) and OH-(aq) ions in solutions.

AContains more

H+(aq) ions than OH-(aq) ions

BContains more

OH-(aq) ions than H+(aq) ions

CThe concentration

of H+(aq) ionsdecreases

DThe number of

H+(aq) and OH-(aq)

ions is the same

EThe concentration

of OH-(aq) ions decreases

FThe concentration

of H+(aq) ions increases

(a) Which box shows an alkaline solution?

A B C

D E F

(b) Which box shows the effect of diluting an acid?

A B C

D E F

(c) Which box shows a description of water?

A B C

D E F

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2. The grid below shows the names of some processes.

Aelectrolysis

Bprecipitation

Ccracking

Devaporation

Edistillation

Ffiltration

(a) Which two boxes in the grid show a method involved in preparing an insoluble salt?

A B C

D E F

(b) Which two boxes show a method involved in making a soluble salt from an insoluble metal oxide?

A B C

D E F

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3. The grid below shows the formulae of some compounds.

APb(OH)2

BBaCl2

CNa2O

DCu(OH)2

E(NH4)2SO4

FH2O

(a) Solutions of which two substances in the grid above will react to form a precipitate?(You may wish to use page 5 of the data booklet to help you)

A B C

D E F

(b) Which box in the grid shows a substance that can form an alkali?(You may wish to use page 5 of the data booklet to help you)

A B C

D E F

(c) Which box shows the product of the reaction between H+(aq) ions and OH-(aq) ions?

A B C

D E F

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Part BWrite your answers in the spaces provided.

1. The apparatus below was used to investigate the reaction between lumps of calcium carbonate and dilute hydrochloric acid.Excess acid was used to make sure all the calcium carbonate reacted. A balance was used to measure the mass lost during the reaction.

(a) Name the type of chemical reaction taking place when calcium carbonate reacts with dilute hydrochloric acid.

1

(b) The results are shown in the table:

Time/mins 0 0.5 1.0 2.0 3.0 4.0 5.0Mass loss/g

0 0.36 0.52 0.7 0.8 0.86 0.86

Why is mass lost during the reaction?

1(c) The experiment was repeated using the same volume and

concentration of acid. The same mass of calcium carbonate was used but powder instead of lumps.Suggest how much mass would have been lost after three minutes.

Answer = g1

(d) Name the salt produced in this reaction. _______________________________________________ 1

(3)

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2. The following equation shows the reaction of potassium hydroxide with hydrochloric acid.

H+(aq) + Cl-(aq) + K+ (aq) + OH-(aq) K+(aq) + Cl-(aq) + H2O(l)

(a) Circle the spectator ions in the above equation.1

(b) Write the equation without the spectator ions to show the actual reaction that occurs between an acid and an alkali.

1

(c) One of the products of the reaction above is the salt potassium chloride (KCl).What is meant by a salt?

1(3)

3. (a) Complete the following equation:

+ sodium hydroxide sodium + _______ sulphate

2

(b) Write the ionic formula for magnesium sulphate.

1(3)

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4. Copper(II) sulphate solution is blue. When it is placed in a beam of light, some of the light is absorbed and some passes through.

David investigated this effect to see if the amount of light passing through depends on the concentration of the copper(II) sulphate solution.

He obtained the following results:

Conc. of CuSO4 (mol l-

1)0.05 0.2 0.4 0.6 0.8 1.0

Light passing through (%)

74.0 29.0 11.0 5.0 3.0 2.0

(a) State the relationship between the amount of light passing through and the concentration of the copper(II) sulphate solution.

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(b) David made the copper(II) sulphate by neutralising sulphuric acid.

(i) Suggest a suitable substance that David could have used to neutralise the sulphuric acid to form copper(II) sulphate.

1

(ii) How would David know that all of the sulphuric acid had been neutralised?

1

(3)

End of test

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