Obtaining useful materials -REVISION

Obtaining useful materials -REVISION

Multiple Select

What are some of the environmental impact of metal extraction?

• land subsidence

• leaching of heavy metals into rivers

• high carbon dioxide released

• noisy/sound pollution

• increase in biodiversity

Multiple Choice

Once a mine is no longer used, the land is restored by planting trees and digging lakes. This is known as...

• reduction

• reclamation

• restoration

• replanting

Page 28 in workbook

• 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

PG 29 in workbook

• 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.

Page 30

• 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%

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Page 39

• carbon dioxide

• global warming

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

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Open Ended

Discuss the advantages and disadvantages of recycling metal (5 mins to google points)