Cambridge IGCSE Chemistry - 0620 - Supplement Paper 2 2014 Winter Zone 3

A few drops of perfume were spilt on the floor. A few minutes later the perfume could be smelt a few metres away.
Which two processes had taken place?
A. distillation and condensation
B. distillation and diffusion
C. evaporation and condensation
D. evaporation and diffusion

The diagram shows three pieces of apparatus that are used for measuring the volume of a liquid.

What are these pieces of apparatus?
[Table_1]

A student is investigating a coloured mixture using chromatography.

Where should he place the coloured mixture?
A. in the solvent
B. just above the pencil line
C. just below the pencil line
D. on the pencil line

Which statement about a neutron is not correct?
A. It can be present in different numbers in atoms of the same element.
B. It has no electrical charge.
C. It is always found in the nucleus of an atom.
D. It weighs much less than a proton.

Which element has the atomic structure shown?


Options:
A. Al
B. P
C. S
D. Si

Image key:

• e: electron
• n: neutron
• Dotted circle: nucleus

Slate has a layered structure and can easily be split into thin sheets.
Which diagram shows a structure most like that of slate?
A B C D

Element X, $^{19}_{9}X$, forms a compound with element Y, $^{39}_{19}Y$.
Which statement describes the bonding in the compound formed?
A) X and Y share electrons.
B) X gives away one electron to Y.
C) Y gives away one electron to X.
D) Y gives away two electrons to X.

Which substance is methane?
[Table_1]

The table shows the numbers of atoms present in the formula of some compounds. Which row is not correct?

[Table_1]

An element, X, can be represented as $^a_bX$.
Which statement is correct?
A. The number of protons in an atom of X is a.
B. The exact position of X in the Periodic Table can be found from a.
C. The relative atomic mass of X is b.
D. The total number of electrons in one atom of X is b.

A student wishes to electroplate an object with copper.
Which row is correct?

[Table_1]

In the electrolysis shown, chlorine is produced at W and sodium at X.

Which labels are correct?
[Table_1]

What occurs when a fuel burns?

[Table_1]

| | fuel reacts with oxygen | energy change | |---|--------------------------|---------------| | A | no | endothermic | | B | no | exothermic | | C | yes | endothermic | | D | yes | exothermic |

Which fuel does not produce air pollution when it burns?
A. coal
B. diesel oil
C. hydrogen
D. gasoline (petrol)

Which graph shows the effect of increasing temperature on the rate of reaction of calcium carbonate with dilute hydrochloric acid?
[Image_1: Graphs A, B, C, D showing rate vs temperature]

The diagram shows the change from an anhydrous salt to its hydrated form.



Which statement is correct?
A forward reaction requires heat and water
B forward reaction requires water only
C reverse reaction requires heat and water
D reverse reaction requires water only

The equations for two reactions P and Q are given.

P $2\underline{\text{NaNO}_2} + \text{O}_2 \rightarrow 2\text{NaNO}_3$
Q $2\underline{\text{HgO}} \rightarrow 2\text{Hg} + \text{O}_2$

In which of these reactions does oxidation of the underlined substance occur?

[Table_1]

Which changes decrease the rate of reaction between magnesium and air?
1. heating the magnesium to a higher temperature
2. using a higher proportion of oxygen in the air
3. using magnesium ribbon instead of powdered magnesium
A 1, 2 and 3
B 1 only
C 2 only
D 3 only

A colourless solution is tested by the following reactions. Which reaction is not characteristic of an acid?
A. A piece of magnesium ribbon is added. Bubbles are seen and the magnesium disappears.
B. A pungent smelling gas is produced when ammonium carbonate is added.
C. Copper oxide powder is added and the mixture is warmed. The solution turns blue.
D. The solution turns blue litmus red.

Which statement about oxides is correct?
A. A solution of magnesium oxide will have a pH less than 7.
B. A solution of sulfur dioxide will have a pH greater than 7.
C. Magnesium oxide will react with nitric acid to make a salt.
D. Sulfur dioxide will react with hydrochloric acid to make a salt.

Which salt preparation uses a burette and a pipette?
A. calcium nitrate from calcium carbonate and nitric acid
B. copper(II) sulfate from copper(II) hydroxide and sulfuric acid
C. potassium chloride from potassium hydroxide and hydrochloric acid
D. zinc chloride from zinc and hydrochloric acid

The graph shows how the pH of soil in a field changes over time.
At which point was the soil neutral?

Which statement about the elements of Group I is correct?
A. Lithium is more dense than sodium.
B. Potassium has a higher density than lithium.
C. Potassium is less reactive than sodium.
D. Sodium has a higher melting point than lithium.

An element X has the two properties listed.
1. It acts as a catalyst.
2. It forms colourless ions.
Which of these properties suggest that X is a transition element?

[Table_1]

Table content:
| | property 1 | property 2 |
|-------|------------|------------|
| A | ✓ | ✓ |
| B | ✓ | ✗ |
| C | ✗ | ✓ |
| D | ✗ | ✗ |

An inert gas X is used to fill weather balloons.
Which descriptions of X are correct?

[Table_1]

number of outer electrons in atoms of X | structure of gas X
A. 2 | single atoms
B. 2 | diatomic molecules
C. 8 | single atoms
D. 8 | diatomic molecules

The metal beryllium does not react with cold water.
It reacts with hydrochloric acid but cannot be extracted from its ore by using carbon.
Where should it be placed in the reactivity series?
magnesium A
zinc B
iron C
copper D

Which information about an element can be used to predict its chemical properties?
A. boiling point
B. density
C. melting point
D. position in the Periodic Table

A list of properties of aluminium is shown.

1. It conducts heat.
2. It has a low density.
3. It is resistant to corrosion.

Which properties make aluminium useful for making food storage containers?
A. 1, 2 and 3
B. 1 and 3 only
C. 1 only
D. 3 only

Which metal is commonly used to form alloys with a non-metallic element?
A. copper
B. iron
C. magnesium
D. zinc

Which object is least likely to contain aluminium?
A a bicycle frame
B a hammer
C a saucepan
D an aeroplane body

Which process does not involve oxidation?
A. burning a fossil fuel
B. conversion of iron from the blast furnace into steel
C. distillation of crude oil
D. rusting of iron

Which pair of compounds would make a N, P, K fertiliser?
A. ammonium sulfate and potassium phosphate
B. calcium hydroxide and ammonium nitrate
C. calcium phosphate and potassium chloride
D. potassium nitrate and ammonium sulfate.

Which method of purification would produce water \textbf{most} suitable for drinking?

[Image_1: A diagram showing different methods of purification from 'muddy river water' to 'purified water'.]

Methods include:
- A: filtration
- B: chlorination
- C: settlement followed by filtration
- D: filtration followed by chlorination

Which statement about methane is \textbf{not} correct?
A. It is a liquid produced by distilling petroleum.
B. It is produced as vegetation decomposes.
C. It is produced by animals, such as cows.
D. It is used as a fuel.

A man blows up a balloon.
What is the approximate composition of his exhaled air in the balloon?
[Table_1: \\begin{array}{|c|c|c|c|} \hline \text{% composition} & \text{carbon dioxide} & \text{oxygen} & \text{nitrogen} \\ \hline A & 0.03 & 20 & 79 \\ \hline B & 0.03 & 79 & 20 \\ \hline C & 4 & 16 & 79 \\ \hline D & 4 & 20 & 75 \\ \hline \end{array}]

Increasing the number of atoms in one molecule of a hydrocarbon increases the amount of energy released when it burns.
What is the correct order?

[Table_1]

Table contains:
| | less energy released | more energy released |
|----------|----------------------|----------------------|
| A | ethene | ethane | methane |
| B | ethene | methane | ethane |
| C | methane | ethane | ethene |
| D | methane | ethene | ethane |

The list gives the names of four organic compounds.
ethane
ethanoic acid
ethanol
ethene
Which bond do all four compounds contain?
A C−C B C=C C C−H D C−O

The diagram shows a reaction sequence.

Which row names the processes X, Y and Z?
[Table_1]

The main constituent of natural gas is hydrocarbon X. To which homologous series does X belong and how many atoms are in one molecule of X?

[Table_1]

[Table_1:
| homologous series | number of atoms in one molecule |
| --- | --- |
| A | alkane | 1 |
| B | alkane | 5 |
| C | alkene | 1 |
| D | alkene | 5 | ]

The equation shows an industrial process.

What is the name of compound X?
A ethane
B ethanoic acid
C ethanol
D methanol