chemistry Paper 2 Q1

1 The diagram shows the changes of state between a solid, a liquid and a gas.

In which changes of state is energy being given out?

• 1 and 2

• 1 and 4

• 2 and 3

• 3 and 4

2 A coloured dye is separated by chromatography. One component of the dye moves a distance of 13 cm and has an Rf value of 0.86. Which distance did the solvent front move?

• 6.6 cm
• 11.9 cm
• 15.1 cm
• 21.6 cm

A mixture contains salt, sand and sulfur.

Salt dissolves in water but not in xylene.

Sulfur dissolves in xylene but not in water.

Sand does not dissolve in water or xylene.

What is the order of the processes used to separate the salt, the sand and the sulfur from the mixture?

• add water --> filter --> add xylene to the filtrate --> filter

• add water --> filter --> add xylene to the residue --> filter

• add xylene --> filter --> add water to the filtrate --> filter

• add xylene --> filter --> add xylene to the residue --> filter

Which statements about isotopes of the same element are correct?

1 They are atoms which have the same chemical properties because they have the same number of electrons in their outer shell.

2 They are atoms which have the same number of electrons and neutrons but different numbers of protons.

3 They are atoms which have the same number of electrons and protons but different numbers of neutrons.

• 1 and 2

• 1 and 3

• 2 only

• 3 only

5 Which type of structure and bonding is present in an element that is malleable and conducts electricity?

• covalent molecular
• ionic lattice
• covalent macromolecular
• metallic lattice

6 Which statements about potassium bromide are correct?

1 It has a high melting point.

2 It dissolves in water.

3 It conducts electricity when solid.

• 1 and 2

• 1 and 3

• 2 and 3

• 3 only

7 Which substance has a similar structure to silicon(IV) oxide?

• carbon dioxide
• diamond
• graphite
• sodium oxide

Caffeine is a stimulant found in coffee.

• A

• B

• C

• D

4.55 g of zinc is reacted with 50 cm³ of 2.25 mol /dm³ dilute hydrochloric acid.

The equation for the reaction is shown.

Zn + 2HCl --> ZnCl₂ + H₂

Which volume of hydrogen gas, at room temperature and pressure, is produced in the reaction?

• 1.35 dm³

• 1.67 dm³

• 2.70 dm³

• 3.34 dm³

In the electrolysis diagram, oxidation is occurring at electrode 1 and reduction at electrode 2.

Which row shows the directions of movement of the electrons in the external circuit and of the positive ions in the electrolyte?

• A

• B

• C

• D