Cambridge IGCSE Chemistry - 0620 - Supplement Paper 2 2015 Winter Zone 1

Diagrams X, Y and Z represent the three states of matter.

Which change occurs during boiling?
A X to Y
B Y to Z
C Z to X
D Z to Y

P, Q, R and S are pieces of apparatus.



Which row describes the correct apparatus for the measurement made?

[Table_1]

Which statement about atoms is correct?
A. Atoms contain protons and electrons in the nucleus.
B. Neutrons are negatively charged.
C. Protons are positively charged.
D. The nucleon number is the number of neutrons.

Which diagram correctly shows the ions present in the compound potassium fluoride?

• A. [Image_1_A]
• B. [Image_1_B]
• C. [Image_1_C]
• D. [Image_1_D]

What do the nuclei of $^1_1\text{H}$ 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

Two atoms of magnesium, Mg, react with one molecule of oxygen, $O_2$.

What is the formula of the product?
A. MgO
B. MgO$_2$
C. Mg$_2$O
D. Mg$_2$O$_2$

Which row describes the electrolysis of molten potassium bromide?

[Table_1]
Table_1:
| | product at anode | product at cathode |
|---|-----------------|-------------------|
| A | bromine | hydrogen |
| B | bromine | potassium |
| C | hydrogen | bromine |
| D | potassium | bromine |

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 acid neutralising alkali causing a temperature increase
B adding magnesium to hydrochloric acid
C calcium carbonate decomposing when heated
D combustion of fossil fuels

Solid hydrated sodium carbonate was added to solid citric acid.
The mixture was stirred and the temperature recorded every 10 seconds.
The results are shown on the graph:

Which row describes the reaction?
[Table_1]

The effect of temperature on the rate of the reaction between marble chips and hydrochloric acid can be investigated by measuring the production of carbon dioxide.
Which item of equipment is not required for the investigation?
A. condenser
B. gas syringe
C. stopclock
D. thermometer

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 $\text{V}_{2}\text{O}_{3} \rightarrow \text{V}_{2}\text{O}_{5}$

Some crystals of hydrated cobalt(II) chloride are heated in a test-tube until no further change is observed. The test-tube is allowed to cool and a few drops of water are then added to the contents. Which colours are observed?

[Table_1]
| before heating | after heating | after adding water |
|:-------------:|:-------------:|:-----------------:|
| A | blue | pink | blue |
| B | blue | white | blue |
| C | pink | blue | pink |
| D | white | blue | white |

The diagram shows a simplified form of the Periodic Table:

Which elements will form an acidic oxide?
A W and Z B W only C X and Y only D Y only

A white solid is insoluble in water.
When it is added to hydrochloric acid, bubbles of gas are formed.
Adding aqueous ammonia to the solution formed gives a white precipitate. Adding excess aqueous ammonia causes the precipitate to re-dissolve.
What is the white solid?
A aluminium nitrate
B ammonium nitrate
C calcium carbonate
D zinc carbonate

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.

Four stages in the preparation of a salt from an acid and a solid metal oxide are listed.

1 Add excess solid.
2 Evaporate half the solution and leave to cool.
3 Filter to remove unwanted solid.
4 Heat the acid.

In which order should the stages be carried out?
A 1 → 3 → 4 → 2
B 2 → 1 → 3 → 4
C 4 → 1 → 3 → 2
D 4 → 2 → 1 → 3

Which statements about Group I and Group VII elements are correct?
1 In Group I, lithium is more reactive than potassium.
2 In Group VII, chlorine is more reactive than fluorine.

[Table_1]

The Periodic Table lists all the known elements.
Elements are arranged in order of .......1....... number.
The melting points of Group I elements .......2....... down the group.
The melting points of Group VII elements .......3....... down the group.
Which words correctly complete the gaps 1, 2 and 3?
[Table_1]

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

[Table_1]

The Group 0 elements are unreactive.
The gas used to fill balloons is .......X....... .
This gas is unreactive because it has .......Y....... electrons in its outermost shell.
Which words correctly complete gaps X and Y?
[Table_1]

Which diagram shows the structure of an alloy?

Diagrams: A, B, C, D

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

What are X, Y and Z?

A
X: calcium
Y: copper
Z: potassium

B
X: copper
Y: calcium
Z: potassium

C
X: potassium
Y: calcium
Z: copper

D
X: potassium
Y: copper
Z: calcium

Which metal would be suitable for all of the following uses?
• making aircraft bodies
• making food containers
• making overhead power cables

A. aluminium
B. brass
C. mild steel
D. pure iron

Iron is extracted from its ore (hematite) in the blast furnace.
Which gas is produced as a waste product?
A. carbon dioxide
B. hydrogen
C. nitrogen
D. oxygen

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

Which is a use of oxygen?
A. as the gas in a lamp
B. to react with ethene to form ethanol
C. to react with methane in a Bunsen burner
D. to react with hematite to form iron

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.

Fertilisers are mixtures of different compounds used to increase the growth of crops.
Which pair of substances contains the three essential elements for plant growth?
A. ammonium nitrate and calcium phosphate
B. ammonium nitrate and potassium chloride
C. ammonium phosphate and potassium chloride
D. potassium nitrate and calcium carbonate

Which process does not produce carbon dioxide?

A. complete combustion of a fossil fuel
B. fermentation
C. reaction of an alkali with a carbonate
D. respiration

The apparatus shown is set up and left for a week. [Image_1 depicting apparatus with air, water, and damp iron wool]
Which diagram shows the level of the water at the end of the week? [Image_2 depicting diagrams A, B, C, D]

Carbon dioxide and methane both contribute to climate change. Which process produces both gases?
A. complete combustion of natural gas
B. farming cattle
C. heating calcium carbonate
D. respiration

A student is asked to draw a diagram showing the uses of limestone.
[Image_1: Diagram showing uses of limestone with lines numbered 1, 2, and 3]
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

The diagram shows the structure of a simple hydrocarbon and the products of two of its reactions.



Which structures are named correctly?

[Table_1]

Which row describes the formation of a polymer?

[Table_1]

What is not the correct use for the fraction named?
[Table_1]

Ethanol can be formed by
1. fermentation
2. reaction between steam and ethene

Which of these processes uses a catalyst?

[Table_1]

Table:
| | 1 | 2 |
|---|---|---|
| A | ✔ | ✔ |
| B | ✔ | ✘ |
| C | ✘ | ✔ |
| D | ✘ | ✘ |

Which homologous series is not represented in the compounds shown below?
[Image_1: Structural diagrams of compounds]
A: alcohols
B: alkanes
C: alkenes
D: carboxylic acids

Alkenes are manufactured by cracking hydrocarbons obtained from petroleum.

Which row describes the size of the molecules in hydrocarbons P and Q and the effect of Q on aqueous bromine?
[Table_1]