What ion is present if a lilac flame is produced in a flame test?
Lithium Li+
Sodium Na+
Potassium K+
Calcium Ca2+
Barium Ba2+
What ion is present if a blue precipitate is formed in the presence of sodium hydroxide?
Iron (II) Fe2+
Iron (III) Fe3+
Copper Cu2+
Magnesium Mg2+
What ion is present if a white precipitate is formed in the presence of sodium hydroxide which dissolves in excess sodium hydroxide?
Aluminium Al3+
Which test is used for detecting carbonate ions?
Adding dilute nitric acid then silver nitrate
Adding dilute hydrochloric acid and bubbling the gas through limewater
Adding dilute hydrochloric acid then barium chloride
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?
Measuring out a fixed volume of alkali
Measuring the volume of acid added
What would you use a burette for in an acid-alkali titration?
How many cm^3 make up 1 dm^3?
10
100
1000
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?
Silver nitrate test
Titration
Gel electrophoresis
What is dynamic equilibrium?
The point at which the reversible reaction stops
The point at which the rate of forward reaction is equal to the rate of backward reaction
The point at which a see-saw is balanced
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?
Increase the pressure
Decrease the pressure
If the forward reaction is endothermic, what should you do in order to maximise the yield of products?
Increase the temperature
Decrease the temperature
Which process is used to make ammonia?
Bessemer process
Contact process
Haber-Bosch process
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.
