CHEMISTRY PAPER 1 (NO. 1)

A student has to measure 28.2 cm3 of aqueous sodium bromide.
Which piece of apparatus should the student select?

Which property of a liquid ester can be used to check its purity before use as a food flavouring?

Which sequence of procedures is used to separate a pure, dry sample of hydrated
copper(II) sulfate, CuSO4•5H2O, from a mixture containing hydrated copper(II) sulfate and
calcium carbonate, CaCO3?

J is an aqueous solution.
On addition of aqueous sodium hydroxide to J a green precipitate is formed.
The resulting mixture is heated and no gas is formed.
Aluminium foil is added to the warmed mixture. A gas is formed that turns damp red litmus paper
blue.
Which ions could be present in J?

Gas X has the following properties.
1
colourless
2
no effect on either damp red or blue litmus papers
3
no effect on limewater
4
flammable
What is gas X?

Which particle contains most electrons?

The diagrams show the structures of two solids, P and Q.

Which row is correct?

What is a covalent bond?

The empirical formula of compound X is CH2 and the relative molecular mass, Mr, of X is 70.
What is the molecular formula of X?

A chemist wants to make calcium nitrate. They start with 8.00 g of pure calcium oxide and an
excess of dilute nitric acid. They produce 12.65 g of pure, dry anhydrous calcium nitrate crystals.
What is the percentage yield of calcium nitrate?
[relative atomic masses, Ar: Ca, 40; N, 14; H, 1; O, 16]

The relative formula masses of four compounds are given.
A student has a 1.0 g sample of each compound.
Which sample contains the highest number of moles of oxygen atoms?

How many elements combine to form the compound ammonium sulfate?

An aqueous mixture of copper(II) nitrate and silver nitrate is electrolysed with pure copper
electrodes.
Which half-equation correctly describes the change occurring at the anode?

The diagram shows the electrolysis of concentrated and dilute aqueous sodium chloride using
inert electrodes. Gases are produced and collected in each of the test-tubes W, X, Y and Z.

Which statements are correct?
1
Approximately equal volumes of gas are produced and collected in test-tubes W
and X.
2
Approximately equal volumes of gas are produced and collected in test-tubes Y
and Z.
3
Three different gases are produced in the experiment.

Which positive ions are present in aqueous copper(II) sulfate?

These statements refer to hydrogen and its use as a fuel.
1
Both water and hydrocarbons can be used as a source of hydrogen.
2
In a fuel cell hydrogen reacts with oxygen to generate electricity.
3
The reaction taking place in a fuel cell is a redox reaction.
Which statements are correct?

Ethanol is produced by the fermentation of glucose from sugar cane. In some countries ethanol is
used as a fuel.
Which statements are correct?
1
Sugar cane is a non-renewable (finite) resource.
2
When sugar cane is growing it removes carbon dioxide from the atmosphere.

Which changes will speed up a chemical reaction?
1
decreasing the pressure in a reaction between gases
2
increasing the size of the solid particles in a reaction involving solids
3
increasing the temperature of any reaction
4
increasing the concentration of a solution

Magnesium reacts with dilute sulfuric acid.

Two experiments are carried out at 25  degrees Celsius.
experiment 1
24.0 g of powdered magnesium is reacted with 100 cm3 of 1.0 mol / dm3
sulfuric acid.
experiment 2
24.0 g of powdered magnesium is reacted with 50 cm3 of 2.0 mol / dm3
sulfuric acid.
During each experiment the volume of hydrogen produced is measured. The results are plotted
on a graph.
Which graph is correct?

In which equations is the change in the underlined species correct?

The Haber process converts nitrogen and hydrogen into ammonia.

Which row is correct?

Which row shows the pH values for 0.1 mol / dm3 solutions of ammonia, hydrochloric acid,
sodium chloride and sodium hydroxide?

The water in a lake is acidic and the fish are dying. The water in the lake needs to be neutralised.
Which compound can be added in excess to neutralise the water in the lake?

Two incomplete statements about the preparation of an insoluble salt are given.
……1…… can be used to prepare insoluble salts, such as ……2…… .
The salt is collected by …… 3…… and it is then ……4…… .
Which words correctly complete gaps 1–4?

The Haber process is used to make ammonia at a temperature of 400 C and a pressure of
20 000 kPa. The temperature is changed to 500 C but the pressure is kept the same.
What will be the effects of this change on the production of ammonia?

Some properties which indicate the differences in elements are listed.
1
metallic character
2
number of electron shells in an atom
3
number of protons in an atom
4
total number of electrons in an atom
Which two properties increase across a period of the Periodic Table?

Elements X and Y combine to form an ionic compound.
Atoms of X have more protons than atoms of Y.
Atoms of Y have more valence electrons than atoms of X.
Which statement is correct?

The elements in Group I of the Periodic Table show trends in both their reactivities and their
melting points. Rubidium is in Group I.
Which statement about rubidium is correct?

The properties of four substances are shown.
Which substance is a metal?

Group I elements and transition elements are metals.
Student X suggests that the Group I elements are above hydrogen in the metal reactivity series
but that not all transition elements are.
Student Y suggests that the densities of Group I elements are lower than those of the transition
elements.
Which students are correct?

Tin is more reactive than lead but less reactive than iron.
Which method would be most suitable for extracting tin from its ore?

Attaching pieces of magnesium to underground iron pipes can protect the iron from corrosion.
Which reaction protects the iron from corrosion?

Which reactions take place during the extraction of aluminium from aluminium oxide using carbon
electrodes?

Which statement about gases in the atmosphere is correct?

How many moles of hydrogen chloride are formed when one mole of methane reacts with a large
excess of chlorine in sunlight?

Compound X is shown in the dot-and-cross diagram.

Which statement about compound X is correct?

Which statements about alcohols are correct?
1
All alcohols contain the hydroxide ion, OH–.
2
Ethanol can be formed from ethene using a reaction catalysed by yeast.
3
Methanol can be oxidised to methanoic acid.
4
The alcohols X and Y shown are isomers.

An ester has the formula C2H5COOC2H5.
Which pair of compounds would react together to form this ester?

Which statement about polymers is correct?

X is a polymer.
When X is hydrolysed one of the products is substance Y.

Which type of polymer is X?