Cambridge IGCSE Chemistry - 0620 - Core Paper 1 2010 Summer Zone 1

The diagram shows a 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]

A fruit drink coloured orange contains a dissolved mixture of red and yellow colouring agents. One of these colouring agents is suspected of being illegal.
Which method could be used to show the presence of this illegal colouring agent?

A student carries out an experiment to find how fast 3 cm pieces of magnesium ribbon dissolve in 10 cm$^3$ samples of sulfuric acid at different temperatures. Which piece of apparatus does the student not need?

Which row shows the change that takes place when element X gains the new particle shown?
[Table showing 'particle gained' and 'change']

The diagram shows an atom.
What is the proton number and neutron number of the atom?

The symbols of two atoms may be written as shown.
\( ^{52}_{23}X \) \( ^{52}_{24}Y \)
Which statement about these atoms is correct?

Which name is given to mixtures of metals?

Element X has six electrons in its outer shell.

How could the element react?

In which compounds are pairs of electrons shared between atoms?
1. sodium chloride
2. methane
3. lead bromide

Hydrogen and chlorine react as shown.
1 molecule of hydrogen + 1 molecule of chlorine \rightarrow 2 moles of hydrogen chloride.
What is the equation for this reaction?

The diagram shows apparatus for plating a spoon with silver.
Which statement is not correct?

Aqueous copper(II) sulfate solution is electrolysed using inert electrodes.
Copper(II) ions (Cu^{2+}), hydrogen ions (H^{+}), hydroxide ions (OH^{-}) and sulfate ions (SO_4^{2-}) are present in the solution.
To which electrodes are the ions attracted during this electrolysis?
[Table_1]

Three electrolysis cells are set up. Each cell has inert electrodes. The electrolytes are listed below.

In which cells is a gas formed at both electrodes?

Clouds are formed when water vapour evaporates from the sea.

What is the energy change and what name is given to the type of change when water evaporates?
[Table_1]

Which process is \textit{not} exothermic?

A student investigates the rate of reaction between marble chips and hydrochloric acid.
The loss in mass of the reaction flask is measured.
The graph shows the results of two experiments, P and Q.

Which change explains the difference between P and Q?

When pink cobalt(II) sulfate crystals are heated, they form steam and a blue solid.
When water is added to the blue solid, it turns pink and becomes hot.
Which terms describe the pink cobalt(II) sulfate crystals and the reactions?
[Table_1]

Iron is extracted from iron oxide using carbon monoxide as shown in the equation.

iron oxide + carbon monoxide \(\rightarrow\) iron + carbon dioxide

What does the equation show?

Aqueous sodium hydroxide is added to a solid, X, and the mixture is heated.
A green precipitate is formed and an alkaline gas is given off.
Which ions are present in X?

An aqueous solution of the organic compound methylamine has a pH greater than 7. Which statement about methylamine is correct?

The positions in the Periodic Table of four elements are shown.
Which element is most likely to form an acidic oxide?

An excess of copper(II) oxide is added to dilute sulfuric acid to make crystals of hydrated copper(II) sulfate.
The processes listed may be used to obtain crystals of hydrated copper(II) sulfate.

1. concentrate the resulting solution
2. filter
3. heat the crystals
4. wash the crystals

Which processes are needed and in which order?

Which is not a property of Group I metals?

An element melts at 1455°C, has a density of 8.90g/cm$^3$ and forms a green chloride. Where in the Periodic Table is this element found?

An element does not conduct electricity and exists as diatomic molecules. In which area of the Periodic Table is the element to be found?

Solutions of a halogen and a sodium halide are mixed.
Which mixture darkens in colour because a reaction occurs?

Copper, iron and zinc are all used as pure metals. Which of these three metals are also used in alloys? [Table_1]

Some properties of four elements are shown in the table.
Which element is a metal?
[Table_1: melting point/°C, electrical conductivity when liquid, electrical conductivity when solid]

A student added dilute hydrochloric acid to four metals and recorded the results.
Not all of the results are correct.
[Table_1]
Which two results are correct?

The diagram shows the manufacture of steel. What is gas X?

Aluminium is an important metal with many uses. Some of its properties are listed.
1. It is a good conductor of heat.
2. It is a reactive metal.
3. It has a low density.
4. It has an oxide layer that prevents corrosion.
Which set of properties help to explain the use of aluminium for cooking and storing food?

Which statements about water are correct?
1. Water is treated with chlorine to kill bacteria.
2. Household water may contain salts in solution.
3. Water is used in industry for cooling.
4. Water for household use is filtered to remove soluble impurities.

Which compound in polluted air can damage stonework and kill trees?

Which statement about methane is not correct?

To grow roses, a fertiliser containing nitrogen, phosphorus, and potassium is needed.
For the best flowers, the fertiliser should contain a high proportion of potassium.
Which fertiliser is best for roses?
[Table_1]

The diagram shows three types of item.
Which method of rust prevention can be used for all three types of item?

Which structure is incorrect?

Which structure shows a compound that belongs to a \textbf{different} homologous series to propane?
[Image of structures: A, B, C, D]

A macromolecule is a very large molecule.
Macromolecules can be made by joining smaller molecules together. This is called polymerisation.
Which row in the table describes the formation of a polymer?
[Table_1]

Diesel, petrol and bitumen are all