AQA GCSE Chemistry Unit 3.4

What ion is present if a lilac flame is produced in a flame test?

What ion is present if a blue precipitate is formed in the presence of sodium hydroxide?

What ion is present if a white precipitate is formed in the presence of sodium hydroxide which dissolves in excess sodium hydroxide?

Which test is used for detecting carbonate ions?

Which test is used for detecting halide ions?

Which test is used for detecting sulphate ions?

What would you use a pipette for in an acid-alkali titration?

What would you use a burette for in an acid-alkali titration?

How many cm^3 make up 1 dm^3?

True or false? When calculating the concentration of a substance in a titration, you have to divide the number of moles used by the volume of the solution.

True or false? The sodium hydroxide test is a type of quantitative chemical test.

What test is carried out to analyse DNA?

What is dynamic equilibrium?

True or false? If you increase the concentration of a reactant, more of the products will be formed in a reversible reaction.

If the forward reaction produces more molecules of gas than the backward reaction, what should you do to maximise the yield of products?

If the forward reaction is endothermic, what should you do in order to maximise the yield of products?

Which process is used to make ammonia?

True or false? Unreacted gases in the Haber-Bosch process are not recycled.

True or false? The pressure in the Haber-Bosch process is 200atm because, although high pressure increases yield, it becomes increasingly difficult to find suitable storage containers.

True or false? The temperature of the Haber-Bosch process is 450°C because, although the reaction is exothermic and needs a lower temperature to maximise yield, too low temperatures stop the iron catalyst from working properly.