The apparatus shown is set up to plate a steel key with copper.

The key does not get coated with copper.

Which change needs to be made to plate the key?

The experiment shown is used to test potassium bromide crystals.

The lamp does not light. Distilled water is then added to the beaker and the lamp lights. Which statement explains these results?

Aluminium is manufactured by electrolysis of molten aluminium oxide.

Which gas is not formed during this process?

Which pair of metals X and Y will produce the highest voltage when used as electrodes in a simple cell?

Which pair of compounds are both esters and are isomers of each other?

An organic compound has an empirical formula C₂H₄O.

What could the compound be?

Which statements would be true of the compound which has the formula shown?

1. It would react with excess aqueous sodium hydroxide in a 1:1 molar ratio

2. In aqueous solution, it would have a pH of 9.5

3. It would react with an alcohol to form an ester

Which compound has more than two carbon atoms per molecule?

Which compound has pH of less than 7?

Which statement about the properties of the four alkanes from methane to butane is not correct?

Methane is the first member of the alkane series of hydrocarbons. The second member is ethane.

Which statements about ethane are correct?

1 Ethane has the formula C₂H₄.

2 Ethane has a higher boiling point than that of methane.

3 Ethane has the same molecular formula as methane.

4 Ethane has chemical properties very similar to those of methane.

Under certain conditions 1 mole of ethane reacts with 1 mole of chlorine in a substitution reaction.

What is the formula of the organic product in this reaction?

A mixture of four gases, methane, ethane, propane and butane is cooled until the first drop of liquid is formed.

What compound is most likely to be present in this drop?

When cracked, one mole of a compound X produces one mole of propene and one mole of hydrogen.

What type of compound is X?

Which statement about members of the homologous series of alcohols is correct?

The structural formulae of some organic compounds are shown below.

Which compounds are alcohols?

The alcohol C₄H₉OH on oxidation with acidified potassium dichromate (VI) will give a carboxylic acid X.

Which acid is X?

How many of the following statements about ethanol are correct?

1 molecular formula is C₂H₆O

2 manufactured from ethane and steam

3 oxidises to ethanoic acid

4 produced by the fermentation of glucose

5 used as a fuel

6 used as a solvent

Alcohols can be oxidised to form another homologous series of compounds.

What would be the product of the oxidation of propanol?