Cambridge IGCSE Chemistry - 0620 - Supplement Paper 2 2011 Summer Zone 3

The diagrams show the arrangement of particles in three different physical states of substance X.

Which statement about the physical states of substance X is correct?
A. Particles in state 1 vibrate about fixed positions.
B. State 1 changes to state 2 by diffusion.
C. State 2 changes directly to state 3 by condensation.
D. The substance in stage 3 has a fixed volume.

In the diagrams, circles of different sizes represent atoms of different elements. Which diagram represents hydrogen chloride gas? [Image_1: Diagrams A, B, C, D with varying circle sizes]

The diagram shows part of the Periodic Table.

Which element is correctly matched with its electronic structure?

[Table_1]
| | electronic structure |
|---|---------------------|
| A | 2,8,1 |
| B | 2,4 |
| C | 2,8,2 |
| D | 2,8 |

An aqueous solution is coloured.
Which method of separation would show that the solution contains ions of different colours?

A. chromatography
B. crystallisation
C. distillation
D. filtration

The table gives the solubility of four substances in ethanol and in water.
A mixture containing all four substances is added to ethanol, stirred and filtered.
The solid residue is added to water, stirred and filtered.
The filtrate is evaporated to dryness, leaving a white solid.
Which is the white solid?

[Table_1]
solubility in
ethanol | water
A insoluble | insoluble
B insoluble | soluble
C soluble | insoluble
D soluble | soluble

Which two elements react together to form an ionic compound?

[Table_1]

A W and X
B X and Y
C Y and Z
D Z and W

Electricity is passed through concentrated aqueous sodium chloride, as shown.

What is the test for the gas formed at the positive electrode?
A bleaches damp litmus paper
B 'pops' with a lighted splint
C relights a glowing splint
D turns damp red litmus paper blue

Electricity from a power station passes through overhead cables to a substation and then to a school where it is used to electrolyse concentrated hydrochloric acid using inert electrodes.
Which substances are used for the overhead cables and for the electrodes?

[Table_1:
| overhead cables | electrodes |
|-----------------|------------|
| A | aluminium | copper |
| B | aluminium | platinum |
| C | copper | platinum |
| D | platinum | aluminium |]

The nucleon number and proton number of the lithium atom are shown by the symbol $\mathrm{_3^7Li}$.
What is the correct symbol for the lithium ion in lithium chloride?

A $\mathrm{_2^6Li^-}$   B $\mathrm{_3^6Li^+}$   C $\mathrm{_3^7Li^+}$   D $\mathrm{_3^7Li^-}$

Three processes are listed.

burning methane in air
radioactive decay of $^{235}$U
reacting hydrogen with oxygen.

Which statements about these processes are correct?

1. Hydrogen and methane are being used as fuels.
2. All the processes involve oxidation.
3. All the processes are used to produce energy.

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

Which statement about the electrolysis of molten lead(II) bromide is correct?

A. A colourless gas is seen at the cathode.
B. A grey metal is seen at the anode.
C. A red/brown gas is seen at the anode.
D. A red/brown metal is seen at the cathode.

What is the relative molecular mass $(M_r)$ of $HNO_3$?
A) 5
B) 31
C) 32
D) 63

The equation for the effect of heat on hydrated sodium carbonate is as shown.

$$\text{Na}_2\text{CO}_3·10\text{H}_2\text{O(s)} \rightleftharpoons \text{Na}_2\text{CO}_3\text{(s)} + 10\text{H}_2\text{O(g)}$$

Statements made by four students about the reaction are given.

P Anhydrous sodium carbonate is formed.
Q Steam is formed.
R There is a colour change from blue to white.
S The reaction is reversible.

Which students’ statements are correct?

A P, Q and R only
B P, Q and S only
C Q, R and S only
D P, Q, R and S

The apparatus shown can be used to measure the rate of some chemical reactions.
For which two reactions would the apparatus be suitable?
reaction 1: $AgNO_3(aq) + HCl(aq) \rightarrow AgCl(s) + HNO_3(aq)$
reaction 2: $2H_2O_2(aq) \rightarrow 2H_2O(l) + O_2(g)$
reaction 3: $MgO(s) + 2HCl(aq) \rightarrow MgCl_2(aq) + H_2O(l)$
reaction 4: $ZnCO_3(s) + 2HCl(aq) \rightarrow ZnCl_2(aq) + CO_2(g) + H_2O(l)$
A 1 and 2
B 1 and 3
C 2 and 4
D 3 and 4

A student investigates the rate of reaction between magnesium and excess sulfuric acid. The volume of hydrogen given off in the reaction is measured over time. The graph shows the results of two experiments, R and S.

Which change in conditions would cause the difference between R and S?
A A catalyst is added in S.
B The acid is more concentrated in R than in S.
C The magnesium is less finely powdered in R than in S.
D The temperature in R is lower than in S.

Butane, ethanol and hydrogen are fuels.
Which substances produce both carbon dioxide and water when used as a fuel?

[Table_1]

Table 1:

X is a monatomic gas.
Which statement about X is correct?
A X burns in air.
B X is coloured.
C X is unreactive.
D X will displace iodine from potassium iodide.

The equation shows the reaction between a halogen and aqueous bromide ions.
$$ X_2 + 2Br^- (aq) \rightarrow 2X^- (aq) + Br_2 $$
...1... ...2... ...3...
Which words correctly complete gaps 1, 2 and 3?
[Table_1]

Carbon dioxide is an acidic oxide that reacts with aqueous calcium hydroxide.
Which type of reaction takes place?
A decomposition
B fermentation
C neutralisation
D oxidation

A solution contains barium ions and silver ions.
What could the anion be?
A) chloride only
B) nitrate only
C) sulfate only
D) chloride or nitrate or sulfate

A mixture containing two anions was tested and the results are shown below.

[Table_1]

Which anions were present?

A carbonate and chloride
B carbonate and iodide
C sulfate and chloride
D sulfate and iodide

Which is not a typical property of an acid?
A. They react with alkalis producing water.
B. They react with all metals producing hydrogen.
C. They react with carbonates producing carbon dioxide.
D. They turn litmus paper red.

The diagram shows a section of the Periodic Table.
Which elements will conduct electricity at room temperature?
A V, W and X B V, Y and W C W, X and Z D Y and Z

Water from a reservoir flows to the water works where purification processes 1 takes place followed by process 2.
What are purification processes 1 and 2?

[Table_1]
| | purification process 1 | purification process 2 |
|------------|---------------------------|---------------------------|
| A | chlorination | filtration |
| B | filtration | chlorination |
| C | fractional distillation | filtration |
| D | filtration | fractional distillation |

The properties of a metal are important in deciding its use. Which row lists a property that is not correct for the use given?

[Table_1]

| use of the metal | metal property needed |
| ---------------- | -------------------- |
| A | aluminium in aircraft wings | low density |
| B | aluminium in food containers | resists corrosion |
| C | mild steel in car bodies | high density |
| D | stainless steel in cutlery | does not rust |

Brass is an alloy of copper and zinc. Which statement is correct?
A Brass can be represented by a chemical formula.
B Brass is formed by a chemical reaction between copper and zinc.
C The alloy will dissolve completely in dilute hydrochloric acid.
D The zinc in the alloy will dissolve in dilute hydrochloric acid.

Which statement is correct for the element of proton number 19?
A It is a gas that dissolves in water.
B It is a hard metal that is not very reactive with water.
C It is a non-metal that burns quickly in air.
D It is a soft metal that is highly reactive with water.

Which row describes the conditions used to make steel from the iron produced by a blast furnace?
[Table_1]

The table shows the results of adding three metals, P, Q and R, to dilute hydrochloric acid and to water.

[Table_1]

What is the order of reactivity of the metals?

[Table_2]

Which substance is a metal?
[Table_1]
Table 1:
| | electrical conductivity
| | (solid) | electrical conductivity
| | | (molten) |
|----------|--------------------|--------------------|
| A | high | high |
| B | high | low |
| C | low | high |
| D | low | low |

Greenhouse gases may contribute to climate change.
Two of these gases are emitted into the atmosphere as a result of processes within animals.
Gas ……1…… is produced by process ……3…… .
Gas ……2…… is produced by process ……4…… .
Which words correctly complete gaps 1, 2, 3 and 4?

| | 1 | 2 | 3 | 4 |
|---|-----|------|-----------|-----------|
| A | CO | C$_2$H$_6$ | digestion | respiration |
| B | CO | C$_2$H$_6$ | respiration | digestion |
| C | CO$_2$ | CH$_4$ | digestion | respiration |
| D | CO$_2$ | CH$_4$ | respiration | digestion |

The diagram shows the composition by volume of air.
What is X?
A argon
B carbon dioxide
C nitrogen
D oxygen

The table gives the composition of the atmosphere of four newly discovered planets.

[Table_1]
| planet | composition of atmosphere | |--------|--------------------------------| | W | argon, carbon dioxide and oxygen | | X | argon, nitrogen and oxygen | | Y | argon, carbon dioxide and methane | | Z | methane, nitrogen and oxygen |

On which planets is the greenhouse effect likely to occur?

A. W only
B. W, X and Z
C. W and Y only
D. W, Y and Z

Which two substances, when reacted together, would form a salt that contains two of the essential elements provided by fertilisers?
A. potassium hydroxide and nitric acid
B. potassium hydroxide and sulfuric acid
C. sodium hydroxide and nitric acid
D. sodium hydroxide and sulfuric acid

Statement 1: Alloying iron with other materials to form stainless steel prevents iron from rusting by excluding oxygen.
Statement 2: Painting, oiling and electroplating are all methods of preventing iron from rusting.
Which is correct?
A Both statements are correct and statement 2 explains statement 1.
B Both statements are correct but statement 2 does not explain statement 1.
C Statement 1 is correct but statement 2 is incorrect.
D Statement 2 is correct but statement 1 is incorrect.

What is the main constituent of natural gas?
A. carbon dioxide
B. ethane
C. hydrogen
D. methane

What is not essential for the formation of ethanol by fermentation?
A. light
B. sugar
C. yeast
D. water

Which industrial process is shown in the diagram? A. cracking B. fermentation C. fractional distillation D. polymerisation

The diagram shows the structures of three compounds.

Why do these three compounds belong to the same homologous series?
A They all contain carbon, hydrogen and oxygen.
B They all contain the same functional group.
C They are all carbon based molecules.
D They are all flammable liquids.

Compounds containing five carbon atoms in a molecule may have names beginning with 'pent…'. What is the name of the compound shown? A. pentane B. pentanoic acid C. pentanol D. pentene