Cambridge IGCSE Chemistry - 0620 - Core Paper 1 2011 Summer Zone 1

The diagrams show the arrangement of particles in three different physical states of substance X.

Which statement about the physical states of substance X is correct?

An aqueous solution is coloured.
Which method of separation would show that the solution contains ions of different colours?

The table gives the solubility of four substances in ethanol and in water.
A mixture containing all four substances is added to ethanol, stirred and filtered.
The solid residue is added to water, stirred and filtered.
The filtrate is evaporated to dryness, leaving a white solid.
Which is the white solid?
[Table_1]

Which two elements react together to form an ionic compound?
[Table_1]

element | electronic structure
---------|---------------------
W | 2,4
X | 2,8
Y | 2,8,1
Z | 2,8,7

The diagram shows part of the Periodic Table.
Which element is correctly matched with its electronic structure?

In the diagrams, circles of different sizes represent atoms of different elements. Which diagram represents hydrogen chloride gas?

The nucleon number and proton number of the lithium atom are shown by the symbol $^7_3\text{Li}$.
What is the correct symbol for the lithium ion in lithium chloride?

What is the relative molecular mass ($M_r$) of $HNO_3$?

Electricity from a power station passes through overhead cables to a substation and then to a school where it is used to electrolyse concentrated hydrochloric acid using inert electrodes.
Which substances are used for the overhead cables and for the electrodes?
[Table_1]

Which statement about the electrolysis of molten lead(II) bromide is correct?

Electricity is passed through concentrated aqueous sodium chloride, as shown.
What is the test for the gas formed at the positive electrode?

Three processes are listed.
burning methane in air
radioactive decay of $^{235}U$
reacting hydrogen with oxygen.
Which statements about these processes are correct?
1. Hydrogen and methane are being used as fuels.
2. All the processes involve oxidation.
3. All the processes are used to produce energy.

Butane, ethanol and hydrogen are fuels.
Which substances produce both carbon dioxide and water when used as a fuel?
[Table]

The equation for the effect of heat on hydrated sodium carbonate is as shown.

$$\text{Na}_2\text{CO}_3\cdot 10\text{H}_2\text{O}(s) \rightleftharpoons \text{Na}_2\text{CO}_3(s) + 10\text{H}_2\text{O}(g)$$

Statements made by four students about the reaction are given.

P Anhydrous sodium carbonate is formed.
Q Steam is formed.
R There is a colour change from blue to white.
S The reaction is reversible.

Which students’ statements are correct?

The apparatus shown can be used to measure the rate of some chemical reactions.
For which two reactions would the apparatus be suitable?

reaction 1 $\text{AgNO}_3(\text{aq}) + \text{HCl}(\text{aq}) \rightarrow \text{AgCl}(\text{s}) + \text{HNO}_3(\text{aq})$
reaction 2 $2\text{H}_2\text{O}_2(\text{aq}) \rightarrow 2\text{H}_2\text{O}(l) + \text{O}_2(g)$
reaction 3 $\text{MgO}(\text{s}) + 2\text{HCl}(\text{aq}) \rightarrow \text{MgCl}_2(\text{aq}) + \text{H}_2\text{O}(l)$
reaction 4 $\text{ZnCO}_3(\text{s}) + 2\text{HCl}(\text{aq}) \rightarrow \text{ZnCl}_2(\text{aq}) + \text{CO}_2(g) + \text{H}_2\text{O}(l)$

A student investigates the rate of reaction between magnesium and excess sulfuric acid.
The volume of hydrogen given off in the reaction is measured over time.
The graph shows the results of two experiments, R and S. [Graph]
Which change in conditions would cause the difference between R and S?

Carbon dioxide is an acidic oxide that reacts with aqueous calcium hydroxide.
Which type of reaction takes place?

Which is not a typical property of an acid?

A solution contains barium ions and silver ions. What could the anion be?

A mixture containing two anions was tested and the results are shown below.

[Table_1]

Which anions were present?

X is a monatomic gas.



Which statement about X is correct?

The diagram shows a section of the Periodic Table.

Which elements will conduct electricity at room temperature?

The equation shows the reaction between a halogen and aqueous bromide ions.

$X_2 + 2Br^- (aq) \rightarrow 2X^- (aq) + Br_2$

Which words correctly complete gaps 1, 2 and 3?

Which statement is correct for the element of proton number 19?

Brass is an alloy of copper and zinc.
Which statement is correct?

Which substance is a metal?
[Table_1]

The table shows the results of adding three metals, P, Q and R, to dilute hydrochloric acid and to water.
[Table_1]
What is the order of reactivity of the metals?

The properties of a metal are important in deciding its use.
Which row lists a property that is not correct for the use given?

[Table_1]

Which row describes the conditions used to make steel from the iron produced by a blast furnace? [Table_1]

Water from a reservoir flows to the water works where purification process 1 takes place followed by process 2.
What are purification processes 1 and 2?
[Table_1]

The diagram shows the composition by volume of air. What is X?

The table gives the composition of the atmosphere of four newly discovered planets.

[Table_1]

On which planets is the greenhouse effect likely to occur?

Statement 1: Alloying iron with other materials to form stainless steel prevents iron from rusting by excluding oxygen.
Statement 2: Painting, oiling and electroplating are all methods of preventing iron from rusting.
Which is correct?

Which two substances, when reacted together, would form a salt that contains two of the essential elements provided by fertilisers?

Greenhouse gases may contribute to climate change.
Two of these gases are emitted into the atmosphere as a result of processes within animals.
Gas ......1...... is produced by process ......3.......
Gas ......2...... is produced by process ......4.......
Which words correctly complete gaps 1, 2, 3 and 4?
[Table_1] with columns: 1, 2, 3, 4 and rows: A. CO, C2H6, digestion, respiration; B. CO, C2H6, respiration, digestion; C. CO2, CH4, digestion, respiration; D. CO2, CH4, respiration, digestion.

Compounds containing five carbon atoms in a molecule may have names beginning with 'pent...'.
What is the name of the compound shown?

Which industrial process is shown in the diagram?

The diagram shows the structures of three compounds: . Why do these three compounds belong to the same homologous series?

What is the main constituent of natural gas?

What is not essential for the formation of ethanol by fermentation?