1)Name the ores of copper and show their formula
2)Why is copper crushed into fine powder before roasting
3)Write the formula of copper pyrite
4)Write an equation of copper pyrite when its heated in oxygen
5)Why is silica added to the heated copper pyrites
6)Write an equation to show the above reaction
7)Write an equation of heating Cu2S in oxygen
8)Write an equation of heating copper(I)oxide with copper(I)sulphide
9)Name the gas produced above and state it's effect to our environment
10)Name two elements that may collect as slugde at the bottom after electrolysis
1) The ores of copper are copper pyrite (CuFeS2) and copper (II) oxide (CuO).
2) Copper is crushed into a fine powder before roasting to increase the surface area for the reaction to take place more efficiently.
3) The formula of copper pyrite is CuFeS2.
4) The equation of copper pyrite when heated in oxygen is: 2CuFeS2 + 5O2 -> 2FeO + 4SO2 + 2Cu2S
5) Silica is added to the heated copper pyrites to act as a flux and help remove any impurities.
6) The equation to show the reaction of copper pyrite and silica is: CuFeS2 + SiO2 -> Cu2S + FeS + SiO2
7) The equation of heating Cu2S in oxygen is: 2Cu2S + 3O2 -> 2Cu2O + 2SO2
8) The equation of heating copper(I)oxide with copper(I)sulphide is: Cu2O + Cu2S -> 6Cu + SO2
9) The gas produced above is sulphur dioxide (SO2) and it is harmful to the environment as it contributes to air pollution and acid rain.
10) Two elements that may collect as sludge at the bottom after electrolysis are zinc and nickel.