Cambridge IGCSE Chemistry - 0620 - Supplement Paper 2 2015 Winter Zone 3

In which process do particles move closer together but remain in motion?
A. condensation
B. diffusion
C. evaporation
D. freezing

A student was asked to measure the rate of reaction between dilute hydrochloric acid and marble chips at different temperatures.
Some of the apparatus used is shown.



Which two other pieces of apparatus would be needed?
A balance and pipette
B balance and stopclock
C beaker and stopclock
D burette and pipette

Argon, Ar, has a higher relative atomic mass than potassium, K, but appears before it in the Periodic Table.

Why is argon listed before potassium in the Periodic Table?
A. Argon has fewer neutrons than potassium.
B. Argon has fewer protons than potassium.
C. Argon has more neutrons than potassium.
D. Argon has more protons than potassium.

In the following diagrams, X and Y are atoms of different elements.
Which diagram correctly shows the arrangement of outer electrons in a molecule of methane?

What do the nuclei of $^{1}_{1}H$ hydrogen atoms contain?
A. electrons and neutrons
B. electrons and protons
C. neutrons only
D. protons only

The electronic structures of atoms X and Y are shown.

X and Y form a covalent compound.
What is its formula?
A XY₅
B XY₃
C XY
D X₃Y

Copper(II) oxide reacts with ammonia.
The left hand side of the balanced equation for this reaction is:
3CuO + 2NH_3 →
What completes the equation?
A 3Cu + 2HNO_3
B 3Cu + 2N + 3H_2O
C 3Cu + N_2 + 3H_2O
D 3Cu + 2NO + 3H_2O

What are the electrode products when molten silver iodide is electrolysed between inert electrodes?

[Table_1]

The diagram shows a section of an overhead power cable.

Which statement explains why a particular substance is used?
A. Aluminium has a low density and is a good conductor of electricity.
B. Ceramic is a good conductor of electricity.
C. Steel can rust in damp air.
D. Steel is more dense than aluminium.

Which reaction is endothermic?
A. the burning of magnesium ribbon
B. the combustion of methane
C. the decomposition of calcium carbonate
D. the reaction of water with anhydrous copper(II) sulfate

A metal reacts with an aqueous solution.
The graph shows the temperature before, during and after the reaction.

Which row describes the reaction?
[Table_1]

Which of the following changes decreases the rate of the reaction between magnesium and dilute hydrochloric acid?
1 diluting the acid
2 using larger pieces of magnesium
3 cooling the mixture
A 1, 2 and 3
B 1 and 2 only
C 1 and 3 only
D 2 and 3 only

The element vanadium, V, forms several oxides.
In which change is oxidation taking place?
A \( \text{VO}_2 \rightarrow \text{V}_2\text{O}_3 \)
B \( \text{V}_2\text{O}_5 \rightarrow \text{VO}_2 \)
C \( \text{V}_2\text{O}_3 \rightarrow \text{VO} \)
D \( \text{V}_2\text{O}_3 \rightarrow \text{V}_2\text{O}_5 \)

If anhydrous copper(II) sulfate is added to water, which colour change is observed?
A. blue to pink
B. blue to white
C. pink to blue
D. white to blue

Element X is in Group I of the Periodic Table.
Which row shows the type of oxide and whether element X is metallic or non-metallic?

[Table_1]

Table:
| | type of oxide | metallic or non-metallic |
|---|--------------|--------------------------|
| A | acidic | metallic |
| B | acidic | non-metallic |
| C | basic | metallic |
| D | basic | non-metallic |

Three liquids, P, Q and R, are added to a mixture of hydrochloric acid and Universal Indicator solution.
The following observations are made.

P the colour of the indicator turns purple.
Q the colour of the indicator does not change.
R there is effervescence and the indicator turns blue.

What are P, Q and R?

[Table_1]

Which property is not characteristic of a base?
A) It reacts with a carbonate to form carbon dioxide.
B) It reacts with an acid to form a salt.
C) It reacts with an ammonium salt to form ammonia.
D) It turns universal indicator paper blue.

Zinc sulfate is a soluble salt and can be prepared by reacting excess zinc carbonate with dilute sulfuric acid.
Which piece of equipment would not be required in the preparation of zinc sulfate crystals?
A beaker
B condenser
C evaporating dish
D filter funnel

An element, X, is a dark grey crystalline solid at room temperature.
It has a melting point of 114°C and a density of 4.9 g/cm³.
When heated gently it forms a purple vapour.
Where in the Periodic Table is X found?

J and K are two elements from the same period in the Periodic Table.
The table gives some properties of J and K.

[Table_1]

Which statement about J and K is correct?
A) J forms an acidic oxide.
B) J is found to the left of K in the Periodic Table.
C) K forms positive ions when it reacts.
D) K is more metallic than J.

The table gives information about four elements.
Which element is a transition metal?

[Table_1]

Hydrogen and helium have both been used to fill balloons. Which property of helium makes it the preferred choice to hydrogen?
A easily compressed into a gas cylinder
B forms monatomic molecules
C lower density
D unreactive

Which statement is true for all metals?
A. Their atoms lose one or more electrons when they react.
B. They are brittle.
C. They do not conduct electricity when solid.
D. They melt at low temperatures when they are heated.

The diagrams show what happens when three different metals are added to water.

What are X, Y and Z?
[Table_1]

The table shows three uses of aluminium and a reason why aluminium is used for that purpose.

[Table_1]

The table:
use reason
1 aircraft manufacture high tensile strength
2 overhead electricity cables low density
3 food containers resistance to corrosion

Which reasons explain the use?
A 1, 2 and 3
B 1 and 2 only
C 1 and 3 only
D 2 and 3 only

Which conditions are necessary to make mild steel from iron?
A. add calcium oxide and blow oxygen through it
B. heat with calcium oxide
C. heat with carbon and limestone
D. heat with nickel and chromium

Which statements about water are correct?

1. Household water may contain salts in solution.
2. Water for household use is filtered to remove soluble impurities.
3. Water is treated with chlorine to kill bacteria.
4. Water is used in industry for cooling.

A. 1, 2, 3 and 4
B. 1, 2 and 3 only
C. 1, 3 and 4 only
D. 2, 3 and 4 only

The diagram shows the flame produced from burning a hydrocarbon, acetylene, in a welding torch.

Which gas is X?
A hydrogen
B methane
C nitrogen
D oxygen

Carbon monoxide is an air pollutant produced when petrol is burned in a car engine. Why is carbon monoxide considered to be an air pollutant?
A. It causes climate change.
B. It causes the corrosion of buildings.
C. It is a significant greenhouse gas.
D. It is poisonous.

Which compound is \textit{not} a fertiliser?
A. ammonium sulfate, $(NH_4)_2SO_4$
B. calcium hydroxide, $Ca(OH)_2$
C. potassium chloride, $KCl$
D. urea, $CO(NH_2)_2$

In which reaction is carbon dioxide not produced?
A complete combustion of petrol
B hydrochloric acid reacting with magnesium
C respiration
D thermal decomposition of limestone

The apparatus shown is set up and left for a week.



Which diagram shows the level of the water at the end of the week?

A [Image_A]
B [Image_B]
C [Image_C]
D [Image_D]

Unwanted vegetation is sometimes placed in a bin where it decays to form compost. This compost can be used to fertilise soils.
Which gas is likely to be present in a higher percentage inside the bin than in the air outside the bin?
A carbon monoxide
B methane
C oxygen
D sulfur dioxide

A student is asked to draw a diagram showing the uses of limestone.
[Image_1: Diagram showing uses of limestone with labeled numbers]
Which numbered lines show a correct use of limestone?
A 1, 2 and 3
B 1 and 2 only
C 1 and 3 only
D 2 and 3 only

What are the names of the compounds shown in the reaction scheme below?
[Image of chemical reactions and table]
Butane is cracked to form compounds W and X. Compound X undergoes hydration to produce compound Y. Compound Y is oxidized in the presence of oxygen to form compound Z.
Table:
W X Y Z
A ethane ethene ethanol ethanoic acid
B ethane ethene ethanoic acid ethanol
C ethene ethane ethanol ethanoic acid
D ethene ethane ethanoic acid ethanol

Which row describes the formation of a polymer?
[Table_1]

Which row shows the correct use of a fraction obtained by the fractional distillation of petroleum?
[Table_1]

Ethanol can be formed by
1 fermentation
2 reaction between steam and ethene
Which of these processes uses a catalyst?

[Table_1]
| | 1 | 2 |
|---|---|---|
| A | ✓ | ✓ |
| B | ✓ | ✗ |
| C | ✗ | ✓ |
| D | ✗ | ✗ |

The structures of four compounds are shown.

Which are members of the same homologous series?
A. W, X, Y and Z
B. W and X only
C. W, Y and Z only
D. X and Z only

During the process of cracking hydrocarbons, an ....... 1 ....... is converted into an ....... 2 ....... .
The presence of an ....... 3 ....... can be shown by a visible reaction with ....... 4 ....... .
Which words complete gaps 1, 2, 3 and 4?

[Table_1]

| | 1 | 2 | 3 | 4 |
|---|--------|--------|--------|--------|
| A | alkane | alkene | alkene | bromine|
| B | alkane | alkene | alkene | steam |
| C | alkene | alkane | alkane | bromine|
| D | alkene | alkane | alkane | steam |