Cambridge IGCSE Chemistry - 0620 - Core Paper 1 2012 Summer Zone 2

Which diagram shows the process of diffusion?

Which method would be most suitable for the separation of a mixture of sand and water to obtain the sand?

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?

The table contains information about four substances. Which substance is potassium chloride?
[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?

Methane, CH$_4$, burns in the air to form carbon dioxide and water. What is the balanced equation for this reaction?

In which reaction is lead(II) oxide, PbO, oxidised?

The diagram shows an unsuccessful experiment to nickel plate a pan.

Which change is necessary to plate the pan with nickel?

The rates of some chemical reactions can be measured by using the apparatus shown. For which reaction is this apparatus suitable?

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?

Four different gases are passed through the apparatus shown.

Which gas has no effect on either piece of litmus paper?

An aqueous solution of copper(II) sulfate was made by adding excess copper(II) oxide to dilute sulfuric acid. The mixture was heated, stirred and then filtered.
!
What was the pH of the acid before adding the copper(II) oxide and of the solution after filtration?

Aqueous potassium iodide is added to aqueous silver nitrate.
What are the colours of the final precipitate and solution? [Table_1]

Three gas jars contain carbon dioxide, hydrogen and oxygen, as shown.
Which one of the following tests could be used to discover which gas is in each jar?

The diagram shows an outline of part of the Periodic Table.
Which statement about elements X, Y and Z is not correct?

Elements X, Y and Z are in Group VII of the Periodic Table.
X is a gas.
Y is less reactive than Z
Z is a red liquid.
When X, Y and Z are put in order of increasing proton number, which order is correct?

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 aluminium is not correct?

Many metals are extracted from their ores by heating the metal oxide with carbon.
Which metal cannot be extracted using this method?

A metal has the following properties:
• It does not react with cold water.
• It reacts with dilute hydrochloric acid.
• It cannot be extracted from its oxide using carbon.
Between which two metals in the reactivity series should it be placed?

Which statements about the general properties of metals are correct?
1. conduct electricity when solid
2. form acidic oxides
3. high melting point

Water for human use is treated by filtration then chlorination.
Which uses do not need water of this quality?
1. water for cooling in industry
2. water for flushing toilets in the home
3. water for drinking

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 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?

Acetylene, $\text{C}_2\text{H}_2$, is a hydrocarbon. When acetylene and oxygen react, the hot flame produced can be used to weld steel.
Which statement is correct?

Fertilisers are used to provide three elements needed to increase the yield of crops.
Which two compounds, when used together, would provide all three of these elements?

Carbon dioxide and methane are 'greenhouse gases' which contribute to global warming.
Which process does not increase global warming?

When coal and oil burn in power stations, the acidic gas sulfur dioxide is formed. Sulfur dioxide is removed by absorbing it in a liquid sprayed down a tower.
What is liquid X?

The table shows bonds that are present and bonds that are not present in compound X.
[Table_1]
What type of compound is X?

The diagram shows different fuels from which electricity can be generated.

Which box completes the diagram?

The diagram shows apparatus used to separate petroleum into four fractions.



Which fraction contains the smallest hydrocarbon molecules?

[Table_1]

Ethanol is a fuel used in cars. It can be made from petroleum.

$C_4H_{10} \rightarrow C_2H_4 + C_2H_6$ \quad cracking
$C_2H_4 + H_2O \rightarrow C_2H_5OH$ \quad producing ethanol
$C_2H_5OH + 3O_2 \rightarrow 2CO_2 + 3H_2O$ \quad burning

Compounds of how many homologous series appear in these equations?

Butene is an alkene which is manufactured by cracking hydrocarbons.

Which hydrocarbon can be cracked to make butene?

Which substance does not produce carbon dioxide when it burns in oxygen?

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