Obtaining useful materials -REVISION

Q1

Q3. When calcium carbonate is heated, it forms calcium oxide and CO2

Q4. underline the type of reaction occuring when a more reactive metal takes the place of a less reactive metal.

Q5a. when oxygen is lost from a compound

Oreland =150 pounds

Mineralstan = 190 pounds

Oreland because the profit is 200-(100+50)=50. In MIneralstan the profit is 200-(120+70)=10

The new mining cost is 75 so the total cost of production will be 175. Profit =200-175=25pounds

No, Oreland will still not produce aluminium because the total cost of extraction will be 250 which is higher than selling price.

23.65-20.45 =3.2

23.01-20.45 =2.56

3.2-2.56=0.64

2.56/3.2 x 100= 80%

carbon dioxide

global warming

certain gases such as CO2 trap energy in the atmosphere which causes warming effect.