GSCE Chemistry C3 revision sheet

C3 REVISION – QUANTITATIVE CHEMISTRY
A student added marble chips to hydrochloric acid. [H] When calcium carbonate is heated it thermally decomposes into
Balance the symbol equation for the reaction that took place calcium oxide and carbon dioxide.
CaCO3  CaO + CO2
__ HCl + __ CaCO3  __ CaCl2 + __ H2O + __ CO2
Calculate the maximum mass of calcium oxide that could be formed from
1.5 g of calcium carbonate.
Explain why there was a change in mass in the experiment
(relative masses: Ca = 40, C = 12, O = 16)




Calculate the concentration in Calculate the relative formula mass (Mr) of:
g/dm3 for:
Sulfuric acid (H2SO4).
1. 50 g of sodium chloride in
Relative atomic masses: H = 1, S = 32, O = 16
2.5 dm3 of water


[H] When potassium sulfate solution and barium chloride solution are
Ammonia (NH3). mixed together, a displacement reactions takes place and a white
Relative atomic masses: N = 14, H = 1 precipitate is formed.
2. 1.8g of sodium carbonate in K2SO4 (aq) + BaCl2 (aq)  2 KCl (aq) + BaSO4 (s)
862cm3 of water
Calculate the maximum mass of barium sufate that could be formed
Copper oxide (CuO). from 870 cm3 of potassium sulfate.
Relative atomic masses: O = 16, Cu = 64
The concentration of potassium sulfate solution is 2 g/dm3
(relative masses: K = 39, S = 32, O = 16, Ba = 137)
Calculate the mass of potassium
bromide (KBr) dissolved in 200
cm3 of water with a
concentration of 1.5g/dm3 0.50g of sodium chloride is mixed with water
to make 25cm3 of solution.
Calculate the mass of sodium chloride in
10cm3 of solution