Cambridge IGCSE Chemistry - 0620 - Supplement Paper 2 2013 Summer Zone 2

The diagram shows a cup of tea. [Image_1: Cup of tea] Which row describes the water particles in the air above the cup compared with the water particles in the cup? [Table_1] | | moving faster | closer together | |--------|---------------|-----------------| | A | ✓ | ✓ | | B | ✓ | ✗ | | C | ✗ | ✓ | | D | ✗ | ✗ |

The diagram shows an experiment to find the formula of magnesium oxide.
Which piece of apparatus would be needed in addition to those shown?
A a balance
B a measuring cylinder
C a spatula
D a thermometer

Methanol, \( \text{CH}_3\text{OH} \), and ethanol, \( \text{C}_2\text{H}_5\text{OH} \), are miscible liquids.
Which diagram shows apparatus that is used to obtain methanol from a mixture of ethanol and methanol?

The positions of four elements are shown on the outline of the Periodic Table.
Which element forms a coloured oxide?

The diagram shows an atom of an element.
The diagram includes .
How many protons and neutrons are in the nucleus of the atom and in which group and period of the Periodic Table is the element found?

[Table_1]:
| | number of protons | number of neutrons | group number | period number |
|---|------------------|-------------------|-------------|--------------|
| A | 5 | 6 | 3 | 2 |
| B | 5 | 11 | 2 | 3 |
| C | 6 | 5 | 3 | 2 |
| D | 6 | 11 | 2 | 3 |

Electrons from each element are shared by both of the elements in a compound. Which compound matches this description?
A. lead bromide
B. sodium chloride
C. water
D. zinc oxide

The equation shows the reaction between magnesium and sulfuric acid.
$$ \text{Mg} + \text{H}_2\text{SO}_4 \rightarrow \text{MgSO}_4 + \text{H}_2 $$
(Mg = 24, H = 1, S = 32, O = 16)
In this reaction, what mass of magnesium sulfate will be formed when 6g of magnesium reacts with excess sulfuric acid?
A 8
B 24
C 30
D 60

Element X has six electrons in its outer shell.

How could the element react?
A. by gaining two electrons to form a positive ion
B. by losing six electrons to form a negative ion
C. by sharing two electrons with two electrons from another element to form two covalent bonds
D. by sharing two electrons with two electrons from another element to form four covalent bonds

The diagram shows an incomplete circuit.

Which substance causes the lamp to light when added to the glass tube?
A aqueous sodium chloride
B aqueous sugar
C solid sodium chloride
D solid sugar

What is the balanced chemical equation for the reaction between calcium and water?
A. $\text{Ca + H}_2\text{O} \rightarrow \text{CaOH + H}_2$
B. $\text{Ca + H}_2\text{O} \rightarrow \text{Ca(OH)}_2 + \text{H}_2$
C. $\text{Ca + 2H}_2\text{O} \rightarrow \text{CaOH + H}_2$
D. $\text{Ca + 2H}_2\text{O} \rightarrow \text{Ca(OH)}_2 + \text{H}_2$

The diagram shows an electrical cable.
[Image_1: electrical cable diagram]
Which statement about the substances used is correct?
A. The coating is plastic because it conducts electricity well.
B. The core is copper because it conducts electricity well.
C. The core is copper because it is cheap and strong.
D. The core is iron because it is cheap and strong.

Statement 1 Hydrogen is used as a fuel.
Statement 2 When hydrogen burns in the air to form water, heat energy is produced.
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.

Which substance does not require oxygen in order to produce energy?
A. coal
B. hydrogen
C. natural gas
D. $^{235}U$

In which equation is the underlined substance acting as a reducing agent?
A. $\underline{3CO} + Fe_2O_3 \rightarrow 2Fe + 3CO_2$
B. $\underline{CO_2} + C \rightarrow 2CO$
C. $\underline{CuO} + H_2 \rightarrow Cu + H_2O$
D. $\underline{CaO} + H_2O \rightarrow Ca(OH)_2$

The diagram shows an experiment to compare the rate of reaction when a metal is added to hydrochloric acid.
In which test-tube is the reaction fastest?
[Image_1: Diagram showing test-tubes A, B, C, and D with labels for concentrated and dilute hydrochloric acid, and metals zinc and copper.]

Two oxides, X and Y, are added separately to dilute sulfuric acid and dilute sodium hydroxide.
X reacts with dilute sulfuric acid but Y does not react.
Y reacts with aqueous sodium hydroxide but X does not react.
Which type of oxide are X and Y?

| | acidic oxide | basic oxide | metallic oxide |
|------------|--------------|-------------|----------------|
| **A** | X | Y | X |
| **B** | X | Y | Y |
| **C** | Y | X | X |
| **D** | Y | X | Y |

Heating pink cobalt(II) chloride crystals forms a blue solid and steam. The blue solid turns pink when water is added. Which terms describe the pink cobalt(II) chloride and the reaction?
[Table_1]

Concentrated aqueous sodium chloride, concentrated hydrochloric acid and molten lead bromide were separately electrolysed in experiments 1, 2 and 3.



Which statement about the electrode products is correct?
A Gases were given off at the anode in experiments 2 and 3 only.
B Gases were given off at the cathode in experiments 1 and 2 only.
C Metals were formed at the anode in experiments 1 and 3 only.
D Metals were formed at the cathode in experiments 1 and 3 only.

Which statement about the reaction of acids is correct?
A. They react with ammonium salts to form a salt and ammonia only.
B. They react with metal carbonates to give a salt and carbon dioxide only.
C. They react with metal hydroxides to give a salt and water only.
D. They react with metals to give a salt, hydrogen and water only.

The diagram shows an experiment.

What happens to the pieces of litmus paper?
[Table_1]

Two indicators, bromophenol blue and Congo red, show the following colours in acidic solutions and in alkaline solutions.

[Table_1]

A few drops of each indicator are added to separate samples of a solution of pH 2.

What are the colours of the indicators in this solution?

[Table_2]

W, X, Y and Z are elements in the same period in the Periodic Table.
W and Y are metals. X and Z are non-metals.
Which shows the correct order of these elements across the period?
[Image_1: A W X Y Z, B X Z W Y, C Y W X Z, D W Y X Z]

Platinum is a transition metal.
Which statement about platinum is correct?
A. It does not catalyse reactions.
B. It forms coloured compounds.
C. It has a low density.
D. It has a low melting point.

Which element will be less reactive than the other members of its group in the Periodic Table?
A. astatine
B. caesium
C. fluorine
D. rubidium

Bromine is in Group VII on the Periodic Table.
Which describes the appearance of bromine at room temperature?
A grey solid
B purple fumes
C red-brown liquid
D yellow gas

A substance, X, has the following properties:
1. It has a high melting point.
2. It conducts electricity in the solid and liquid states.
3. It is malleable.
4. It had a high density.
What is X?
A. a ceramic
B. copper
C. graphite
D. sodium chloride

Why is aluminium used to make food containers?

A. It has a low density.
B. It is strong.
C. It keeps the food hot.
D. It resists corrosion.

Which statement is incorrect?
A. Carbon dioxide is a waste product in the extraction of iron.
B. Carbon monoxide is a reducing agent.
C. The extraction of iron from hematite involves reduction.
D. When iron is converted into steel, oxygen is used to oxidise the iron.

The diagram represents the structure of substance S.
What is S?
A. an alloy
B. an ionic solid
C. a macromolecule
D. a pure metal

Q, R, S and T are four metals.

Q is found naturally as the metal.
R reacts with steam but not with cold water.
S reacts violently with cold water.
The oxide of T is reduced to T by heating with carbon.

What is the order of reactivity of the four metals, starting with the most reactive first?
A Q → R → T → S
B Q → T → R → S
C S → R → Q → T
D S → R → T → Q

The diagram shows a stage in the purification of dirty water.
Which process does this apparatus show?
A chlorination
B condensation
C distillation
D filtration

The diagrams show two processes.



For which processes is oxygen involved?

[Table_1]

Which substance would make the best general fertiliser?
[Table_1: | | relative amount | solubility in water | |---|------------------|---------------------| | | P | K | N | | | A | 5 | 0 | 5 | soluble | | B | 5 | 5 | 20 | insoluble | | C | 5 | 10 | 15 | soluble | | D | 10 | 5 | 10 | insoluble ]

Which information about carbon dioxide and methane is correct?

[Table_1]

| | carbon dioxide | methane |
|--------------|----------------|---------------|
| A formed when vegetation decomposes | ✓ | ✗ |
| B greenhouse gas | ✓ | ✓ |
| C present in unpolluted air | ✗ | ✗ |
| D produced during respiration | ✗ | ✓ |

key
✓ = true
✗ = false

Which process does not produce carbon dioxide?
A) fermentation
B) respiration
C) the production of lime from limestone
D) the treatment of acidic soil with lime

Organic compounds may have names ending in -ane, -ene, -ol or -oic acid.

How many of these endings indicate the compounds contain double bonds in their molecules?

A 1
B 2
C 3
D 4

In the flow chart, which fuel could be gasoline?

The structures of four molecules are shown:

Which two molecules belong to the same homologous series?
A P and Q
B P and S
C Q and R
D R and S

Which columns describe the hydrocarbons ethane and ethene?

[Table_1]

A 1 (ethane) and 2 (ethene)
B 1 (ethane) and 4 (ethene)
C 2 (ethene) and 3 (ethane)
D 3 (ethane) and 4 (ethene)

Which process is not used during the production of ethanol?
A addition of steam to ethene
B fermentation
C fractional distillation
D reacting ethane with oxygen