1 → 2

1 → 3

2 → 3

3 → 1

A

B

C

D

$^{40}_{18}\text{Ar}$

$^{19}_{9}\text{F}$

$^{23}_{11}\text{Na}$

$^{16}_{8}\text{O}$

brass, carbon, copper

brass, copper, carbon

copper, brass, carbon

copper, carbon, brass

ammonia, $\text{NH}_3$

chlorine, $\text{Cl}_2$

methane, $\text{CH}_4$

water, $\text{H}_2\text{O}$

Graphite has a high melting point.

Graphite is a form of carbon.

Graphite is a lubricant.

Graphite is a non-metal.

5 g

10 g

60 g

120 g

Negative electrode: bubbles of a colourless gas, Positive electrode: bubbles of a brown gas

Negative electrode: bubbles of a colourless gas, Positive electrode: bubbles of a colourless gas

Negative electrode: shiny grey liquid, Positive electrode: bubbles of a brown gas

Negative electrode: shiny grey liquid, Positive electrode: bubbles of a colourless gas

argon

hydrogen

nitrogen

oxygen

A gas is produced.

Energy is released.

Heat is absorbed.

The mass of the fuel decreases.

decrease rate of reaction; decrease rate of reaction

decrease rate of reaction; increase rate of reaction

increase rate of reaction; decrease rate of reaction

increase rate of reaction; increase rate of reaction

The copper(II) sulfate turns blue and the solution formed gets colder.

The copper(II) sulfate turns blue and the solution formed gets hotter.

The copper(II) sulfate turns white and the solution formed gets colder.

The copper(II) sulfate turns white and the solution formed gets hotter.

$C + O_2 \rightarrow CO_2$

$CaCO_3 \rightarrow CaO + CO_2$

$CaO + 2HCl \rightarrow CaCl_2 + H_2O$

$N_2O_4 \rightarrow 2NO_2$

calcium / hydrogen

calcium carbonate / carbon dioxide

calcium hydroxide / hydrogen

calcium oxide / carbon dioxide

A solution of magnesium oxide has a pH less than $7$.

A solution of sulfur dioxide has a pH greater than $7$.

Magnesium oxide reacts with nitric acid to make a salt. (+water)

Sulfur dioxide reacts with hydrochloric acid to make a salt.

1, 2 and 3

1 and 2 only

1 and 3 only

2 and 3 only

iron(II) chloride and iron(III) sulfate

iron(III) chloride and iron(III) sulfate

iron(II) sulfate and iron(III) chloride

iron(III) sulfate and iron(III) chloride

germanium

scandium

sodium

strontium

A sample of bromine reacts with potassium chloride solution.

A sample of bromine reacts with potassium iodide solution.

A sample of chlorine has a higher density than a sample of bromine.

A sample of chlorine is a darker colour than a sample of bromine.

catalytic activity of
transition elements: good,
compounds of transition elements: good

catalytic activity of
transition elements: good,
compounds of transition elements: poor

catalytic activity of
transition elements: poor,
compounds of transition elements: good

catalytic activity of
transition elements: poor,
compounds of transition elements: poor

Noble gases are diatomic molecules.

Noble gases are unreactive gases.

Noble gases have full outer electron shells.

The noble gas argon is used in lamps.

1 and 2

1 and 4

2 and 3

3 and 4

A

Bis the most reactive.

C

D

$C + O_2 \rightarrow CO_2$

$CO_2 + C \rightarrow 2CO$

$CaCO_3 \rightarrow CaO + CO_2$

$CaO + SiO_2 \rightarrow CaSiO_3$

It conducts heat well.

It has a low density.

It is a good conductor of electricity.

It is easy to recycle.

$132 \text{ cm}^3$

$152 \text{ cm}^3$

$180 \text{ cm}^3$

$570 \text{ cm}^3$

Remove the rust and paint the bicycle.

Remove the rust and store the bicycle in a dry shed.

Remove the rust and wipe the bicycle with a clean, damp cloth.

Remove the rust and wipe the bicycle with an oily cloth.

A

B

C

D

Ca, P, O

K, O, S

N, K, P

N, O, S

Atmospheric carbon dioxide is not a cause of climate change.

Atmospheric methane is produced by respiration.

Burning natural gas decreases the level of carbon dioxide in the atmosphere.

Decomposition of vegetation causes an increase in atmospheric methane.

Sulfur dioxide is used as a food preservative.

Sulfur dioxide turns acidified aqueous potassium manganate(VII) from purple to colourless.

Sulfur forms a basic oxide.

Sulfur is used in the manufacture of sulfuric acid.

electrolysis

fractional distillation

incomplete combustion

thermal decomposition

A

B

C

D

A

B

C

D

$C-C$

$C-H$

$C-O$

$O-H$

because they contain fluorine and carbon atoms

because they have saturated bonds

because they have the same functional group

because they react differently from each other

ethanol and ethene

ethanol and hydrogen

ethene and hydrogen

ethene and poly(ethene)

adding steam to ethene

addition polymerisation

fractional distillation of petroleum

reacting ethene with aqueous bromine

1 and 3

1 and 4

2 and 3

2 and 4