Cambridge IGCSE Chemistry - 0620 - Core Paper 1 2012 Summer Zone 1

Which diagram shows the process of diffusion?

Which method is most suitable to obtain zinc carbonate from a suspension of zinc carbonate in water?

A student investigates how the concentration of an acid affects the speed of reaction with a 0.5 g mass of magnesium at 30°C.
The student has a beaker, concentrated acid, water and the apparatus below.
P a balance
Q a clock
R a measuring cylinder
S a thermometer
Which pieces of apparatus does the student use?

An element Y has the proton number 18.
The next element in the Periodic Table is an element Z.
Which statement is correct?

Which atom has twice as many neutrons as protons?

Which is a simple covalent molecule?
[Table_1]

The electronic structures of atoms P and Q are shown.

P and Q react to form an ionic compound.
What is the formula of this compound?

The diagrams show the structures of two forms, P and Q, of a solid element.
What are suitable uses of P and Q, based on their structures?

The equation for the reaction between magnesium and dilute sulfuric acid is shown.
$$\text{Mg} + \text{H}_2\text{SO}_4 \rightarrow \text{MgSO}_4 + \text{H}_2$$
$M_r$ of $\text{MgSO}_4$ is 120.
Which mass of magnesium sulfate will be formed if 12 g of magnesium are reacted with sulfuric acid?

Winston Churchill, a British Prime Minister, had his false teeth electroplated with gold.
The teeth were coated with a thin layer of carbon and were then placed in the apparatus shown.

Which row is correct?

The diagram shows that two gases are formed when concentrated hydrochloric acid is electrolysed using inert electrodes.
Which row correctly describes the colours of the gases at the electrodes?

The diagram shows the reaction between zinc oxide and dilute hydrochloric acid.

Which terms describe the reaction?

The apparatus shown is used to measure the speed of a reaction.

Which equation represents a reaction where the speed can be measured using this apparatus?

The element vanadium, V, forms several oxides. In which change is oxidation taking place?

A gas is escaping from a pipe in a chemical plant. A chemist tests this gas and finds that it is alkaline. What is this gas?

The results of three tests on a solution of compound X are shown in the table.
[Table_1]
What is compound X?

The graph shows how the pH changes as an acid is added to an alkali.
acid + alkali \rightarrow salt + water
Which letter represents the area of the graph where both acid and salt are present?
[Graph Image]

Dilute hydrochloric acid is added to a solid, S.
A flammable gas, G, is formed. Gas G is less dense than air.
What are S and G?
[Table_1]

The diagram shows a section of the Periodic Table.
Which element is described below?
'A colourless, unreactive gas that is denser than air.'

Element X is below iodine in the Periodic Table.
Which row correctly shows the physical state of element X at room temperature and its reactivity compared with that of iodine?
[Table_1]

Which properties of the element titanium, Ti, can be predicted from its position in the Periodic Table? [Table_1]

Five elements have proton numbers 10, 12, 14, 16, and 18. What are the proton numbers of the three elements that form oxides?

Which statement about the uses of metals is correct?

Which statement about the extraction of iron from its ore is correct?

Metal X reacts violently with water.
Metal Y reacts slowly with steam.
Metal Z does not react with dilute hydrochloric acid.
What is the correct order of reactivity of these metals, most reactive first?

Which property is shown by all metals?

Some uses of water are listed.
1 for drinking
2 in chemical reactions
3 in swimming pools
4 in washing
For which uses is it necessary to chlorinate the water?

Coal is a fossil fuel. Which gas is not formed when coal burns?

Which is a use of oxygen?

Fertilisers need to supply crops with three main elements.
Which compound contains all three of these elements?

A new planet has been discovered and its atmosphere has been analysed.

The table shows the composition of the atmosphere.
[Table_1]
Which gases are present in the atmosphere of the planet in a higher percentage than they are in the Earth’s atmosphere?

Gas X is a waste gas from digestion in animals.
Gas Y is formed when gas X is burnt with a small amount of oxygen.
Gas Z is formed when gas X is burnt with an excess of oxygen.
What are X, Y and Z?
[Table_1]

Air containing an acidic impurity was neutralised by passing it through a column containing substance X.

What is substance X?

The structure of a compound is shown.
Which functional groups are present in this compound? [Table_1]

Which fraction from the fractional distillation of petroleum does not match its correct use? [Table_1]

The diagram shows apparatus used to separate petroleum into four fractions.
Which fraction contains the smallest hydrocarbon molecules?
[Table_1]

When a long chain hydrocarbon is cracked, the following products are produced:
1. $C_3H_8$
2. $C_2H_4$
3. $C_3H_6$
4. $C_2H_6$
Which products would decolourise bromine water?

PVA is a polymer. The monomer has the structure shown: To which homologous series does this compound belong? [Table_1]

Which equation represents incomplete combustion of ethane?

Ethanol is an important chemical produced by the ......1...... of ......2....... .
Which words correctly complete gaps 1 and 2?
[Table_1]