Cambridge IGCSE Chemistry - 0620 - Supplement Paper 2 2016 Winter Zone 1

'Particles moving very slowly from an area of higher concentration to an area of lower concentration.'
Which process is being described?

A student mixes 25 cm³ samples of dilute hydrochloric acid with different volumes of aqueous sodium hydroxide.
In each case, the student measures the change in temperature to test if the reaction is exothermic.
Which piece of apparatus is not needed?

Information about the solubility of four solids, P, Q, R and S, is given in the table.

[Table_1]

A student attempted to separate mixtures of these solids using the following method.
1. Add the mixture to a beaker of water and stir.
2. Filter the mixture.
3. Crystallise one of the solids from the filtrate.

Which of the following mixtures could not be separated by this method?

The table shows information about atoms of three different elements.
[Table_1]
What are the values of W, X, Y and Z?

Metal P reacts with non-metal Q to form a compound.
Which process takes place and which type of compound is formed?
[Table_1]

The structure of ethanoic acid is shown.

Which diagram shows the arrangement of outer shell electrons in a molecule of ethanoic acid?

X is a solid at room temperature.
X has a high melting point.
Solid X conducts electricity.
Which diagram shows how the particles are arranged in solid X?

Benzene is a liquid with molecular formula $C_6H_6$.
Ethene is a gas with molecular formula $C_2H_4$.
Which statement is correct?

Sodium hydrogencarbonate undergoes thermal decomposition as shown.
$$2\text{NaHCO}_{3} \rightarrow \text{Na}_{2}\text{CO}_{3} + \text{CO}_{2} + \text{H}_{2}\text{O}$$
What is the maximum mass of sodium carbonate that can be made from 0.100 moles of sodium hydrogencarbonate?

Which apparatus could be used to electroplate an iron nail with copper?

The diagram shows a simple cell.

Which two metals produce the highest reading on the voltmeter?

When anhydrous copper(II) sulfate is added to water a solution is formed and heat is given out.
Which row shows the temperature change and the type of reaction taking place?
[Table_1]
A decrease endothermic
B decrease exothermic
C increase endothermic
D increase exothermic

The energy level diagram for a reaction is shown.

Which statement is not correct for this energy level diagram?

The rate of reaction between magnesium and excess dilute hydrochloric acid was followed by measuring the mass of magnesium present at regular time intervals.

Two experiments were performed.

Both experiments used 0.1 g of magnesium ribbon. The acid in experiment 1 was less concentrated than in experiment 2.

Which graph shows the results of the experiments?

Which statement explains why coal dust forms an explosive mixture with air?

The following reversible reaction takes place in a closed vessel at constant temperature.

$P(g) + Q(g) + R(g) \rightleftharpoons S(g) + T(g)$

When the system has reached equilibrium, more T is added.
After the addition of T, which substances increase in concentration?

Four ionic half-equations are shown.
1 \[ \text{Cu}^{2+}(\text{aq}) + 2\text{e}^- \rightarrow \text{Cu}(\text{s}) \]
2 \[ 2\text{I}^-(\text{aq}) \rightarrow \text{I}_2(\text{aq}) + 2\text{e}^- \]
3 \[ \text{Fe}^{2+}(\text{aq}) \rightarrow \text{Fe}^{3+}(\text{aq}) + \text{e}^- \]
4 \[ \text{Cl}_2(\text{g}) + 2\text{e}^- \rightarrow 2\text{Cl}^-(\text{aq}) \]
Which statement is correct?

Germanium oxide is a white powder.
Germanium oxide reacts with concentrated hydrochloric acid.
Germanium oxide reacts with concentrated aqueous sodium hydroxide.
Germanium oxide does not dissolve when added to water.
Which type of oxide is germanium oxide?

Hydrogen chloride gas reacts with water to produce an acidic solution. The equation for the reaction is shown.
$$\text{HCl} + \text{H}_2\text{O} \rightarrow \text{Cl}^- + \text{H}_3\text{O}^+$$
Which statement describes what happens during the reaction?

The apparatus shown is used to prepare aqueous copper(II) sulfate.

What are X and Y?

Information about some silver compounds is shown in the table.
[Table_1]
Which equation shows a reaction which cannot be used to make a silver salt?

What is not a property of Group I metals?

Four substances, P, Q, R and S, are tested as shown.
[Table_1]
What are P, Q, R and S?

Which statement about transition elements and their compounds is correct?

Impure iron from the blast furnace is converted to steel as shown.

Which statement about the process is correct?

The ionic equations represent the reactions between four metals, P, Q, R and S, and solutions of the salts of the same metals.

P + Q^{2+} \rightarrow \text{no reaction}
R + P^{2+} \rightarrow R^{2+} + P
Q + S^{2+} \rightarrow Q^{2+} + S
S + P^{2+} \rightarrow S^{2+} + P
S + R^{2+} \rightarrow S^{2+} + R
S + Q^{2+} \rightarrow \text{no reaction}

What is the correct order of reactivity of the metals?
[Table_1]

Aluminium is extracted by electrolysis.
From which ore is aluminium extracted and at which electrode is aluminium deposited during electrolysis?
[Table_1]

Zinc oxide can be reacted with carbon to produce zinc metal.
Which equation for this reaction is correct?

Air is a mixture of gases.
Which gas is present in the largest amount?

Which information about carbon dioxide and methane is correct? [Table_1]

Underwater steel pipes can be protected from corrosion by attaching magnesium blocks to them.
Which equation represents the reaction that prevents corrosion?

Ammonia is manufactured by the Haber process. The reaction is exothermic.
$$\text{N}_2(g) + 3\text{H}_2(g) \rightleftharpoons 2\text{NH}_3(g) \quad \Delta H = -92 \text{kJ/mol}$$
Which statement about the Haber process is correct?

Sulfuric acid is manufactured by the Contact process. The most important reaction takes place in the presence of a catalyst. What are the reactants and the catalyst for this reaction? [Table_1]

Which box corresponds to limestone?

Petroleum is an important fossil fuel.
Which row correctly describes petroleum?
[Table_1]

Butane reacts as shown.

What is this type of reaction?

Substance Z has the following characteristics.
1. It burns in an excess of oxygen to form carbon dioxide and water.
2. It is oxidised by air to form a liquid smelling of vinegar.
3. It reacts with carboxylic acids to form esters.
What is substance Z?

Ethanol is manufactured by the catalytic addition of steam to ethene and by fermentation. Which row shows an advantage and a disadvantage of using the catalytic addition of steam to ethene compared to fermentation? [Table_1]

The partial structure of addition polymer X is shown. Which monomer is used to form polymer X?

The diagram shows the partial structure of Terylene.

From which pair of compounds is it made?