Theory

CH11 - ACIDS AND BASES

Aqueous sodium hydroxide is added to a solution of a salt. A blue precipitate is formed which does not dissolve in excess.Aluminium foil is added to t...

2009 Summer

Theory

CH11 - ACIDS AND BASES

The graph shows how the pH of soil in a field changed over time.At which point was the soil neutral?

2009 Summer

Theory

CH11 - ACIDS AND BASES

An element E is burned in air. A white solid oxide is formed.The oxide is tested with damp red litmus paper. The paper turns blue.What is element E?A ...

2009 Summer

Theory

CH11 - ACIDS AND BASES

Some reactions of a substance, R, are shown in the diagram. What type of substance is R? A. an acid B. a base C. an element D. a salt

2009 Summer

Theory

CH11 - ACIDS AND BASES

Substance K reacts with sodium carbonate to form a gas.The gas turns limewater cloudy.What is substance K and which process takes place in the reactio...

2009 Summer

Theory

CH11 - ACIDS AND BASES

Some reactions of a substance, R, are shown in the diagram. What type of substance is R? A an acid B a base C an element D a salt

2009 Summer

Theory

CH11 - ACIDS AND BASES

An element E is burned in air. A white solid oxide is formed. The oxide is tested with damp red litmus paper. The paper turns blue. What is element E?...

2009 Summer

Theory

CH11 - ACIDS AND BASES

The graph shows how the pH of soil in a field changed over time.At which point was the soil neutral?[Graph displaying pH changes over time with points...

2009 Summer

Theory

CH11 - ACIDS AND BASES

Aqueous sodium hydroxide is added to a solution of a salt. A blue precipitate is formed which does not dissolve in excess.Aluminium foil is added to t...

2009 Summer

Theory

CH11 - ACIDS AND BASES

Substance K reacts with sodium carbonate to form a gas.The gas turns limewater cloudy.What is substance K and which process takes place in the reactio...

2009 Summer

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