Paper 1 Exam Qs Flashcards
Give 2 reasons why metals are electroplated with Gold.
Improve the appearance.
Increase the resistance to corrosion.
Give the reason for why the anode gets smaller during electrolysis (of copper sulfate) and why the cathode gets larger.
Anode gets smaller because copper atoms form ions and go into solution.
Cathode gets larger because copper atoms are formed from ions in the solution.
Copper Carbonate reacts with dilute nitric acid.
During the reaction the copper carbonate powder completely disappears.
State what can be deduced about the amount of acid used.
Acid is in excess.
Using different reactants, a solution of copper sulphate was prepared.
Describe what should be done to obtain copper sulphate crystals from this copper sulfate solution.
Heat solution to evaporate water.
Leave to cool.
Describe the experiments that can be done to determine the order of reactivity of Copper, Magnesium and Zinc by displacement reactions.
Place separate pieces of each metal into solutions of each of salt.
Observe changes in appearance/colour of (metal/solution).
The more reactive metal shows the greater number of reactions.
Explain why Aluminium cannot be extracted from its ore by heating with carbon but can be extracted by electrolysis.
Aluminium is more reactive than carbon, carbon cannot remove the oxygen.
Suggest a simple method to separate Titanium from the mixture. (solids magnesium, titanium and magnesium chloride).
Filter the mixture to remove titanium. Wash the Titanium.
Give one advantage of using a hydrogen-oxygen fuel cell, rather than using a chemical cell, to power a vehicle.
Chemical cells contain harmful substances.
How many chromatography spots are produced by pure samples, and why?
The definition of a chemically pure substance is that it consists of only a single element or compound. This means that pure samples will only ever produce 1 chromatography spot regardless of solvent identity.
