Theory

CH15 - AIR AND WATER

An iron nail is placed in a closed test-tube, containing gas L. The nail rusts.What is gas L...

2009 Summer

Theory

CH15 - AIR AND WATER

Which statements are correct?1. Carbon monoxide is responsible for the production of ‘acid rain’.2. Oxides of nitrogen are present in car exhausts...

2009 Summer

Theory

CH15 - AIR AND WATER

The diagram shows stages in the purification of water. Which stage uses chlorine?

2009 Summer

Theory

CH15 - AIR AND WATER

An inert atmosphere is needed in a lamp to lengthen the useful life of the metal filament. Why is argon, rather than helium, used for this purpose? ...

2009 Summer

Theory

CH15 - AIR AND WATER

The diagram shows stages in the purification of water.Which stage uses chlorine?

2009 Summer

Theory

CH15 - AIR AND WATER

Which statements are correct?1. Carbon monoxide is responsible for the production of 'acid rain'.2. Oxides of nitrogen are present in car exhausts.3. ...

2009 Summer

Theory

CH15 - AIR AND WATER

An iron nail is placed in a closed test-tube, containing gas L. The nail rusts.What is gas L?A carbon dioxideB hydrogenC nitrogenD oxygen

2009 Summer

Theory

CH15 - AIR AND WATER

A newspaper article claims that carbon dioxide is formed as follows.1. during respiration2. when calcium carbonate reacts with hydrochloric acid3. whe...

2009 Winter

Theory

CH15 - AIR AND WATER

Which iron nail rusts? [Image_1: Four nails in test tubes labeled A (zinc coated nail), B (painted nail), C (nail in damp cloth), D (nail covered in ...

2009 Winter

Theory

CH15 - AIR AND WATER

A new planet has been discovered and its atmosphere has been analysed.[Image_1: A diagram showing a planet and its atmosphere is labeled]The table sho...

2009 Winter

Theory

CH1 - STATES OF MATTER

The diagram shows the result of dropping a purple crystal into water.Which processes take place in this experiment?[Table_1]| | chemical reac...

2014 Summer

Theory

CH2 - SEPARATING SUBSTANCES

The four pieces of apparatus shown below are used in chemical experiments.Which statement about the apparatus is correct?A. The burette measures the v...

2014 Summer

Theory

CH2 - SEPARATING SUBSTANCES

Alcohol and water are completely miscible. This means when mixed together they form only one liquid layer.Which method is used to separate alcohol fro...

2014 Summer

Theory

CH3 - ATOMS AND ELEMENTS

The diagram shows the structure of an atom of element X. What is X?A. boronB. carbonC. sodiumD. sulfur

2014 Summer

Theory

CH3 - ATOMS AND ELEMENTS

The diagrams show four particles. Which two diagrams show atoms that are isotopes of each other?A 1 and 2B 1 and 3C 2 and 3D 2 and 4

2014 Summer

Theory

CH4 - ATOMS COMBINING

The 'lead' in a pencil is made of a mixture of graphite and clay. When the percentage of graphite is increased, the pencil slides across the paper mor...

2014 Summer

Theory

CH4 - ATOMS COMBINING

Element X is in Group I of the Periodic Table. X reacts with element Y to form an ionic compound.Which equation shows the process that takes place whe...

2014 Summer

Theory

CH4 - ATOMS COMBINING

Solid F is an element.Solid G is a compound.Neither solid conducts electricity but G conducts electricity when dissolved in water.These properties sug...

2014 Summer

Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

A compound contains one atom of calcium, two atoms of hydrogen and two atoms of oxygen.What is the correct chemical formula of the compound?A CaO_2H_2...

2014 Summer

Theory

CH5 - REACTING MASSES AND CHEMICAL EQUATIONS

In athletics, banned drugs such as nandrolone have been taken illegally to improve performance. Nandrolone has the molecular formula $C_{18}H_{26}O_{2...

2014 Summer