13. Carbonates

Question 1

what is chemical name for lime

Answer 1

Calcium oxide (CaO)

Question 2

what is chemical name of limestone

Answer 2

calcium carbonate (CaCO3)

Question 3

how can calcium oxide be manufactured from calcium carbonate

Answer 3

calcium carbonate decomposes when heated to form calcium oxide and carbon dioxide

Question 4

what is the chemical equation for the thermal decomposition of calcium carbonate

Answer 4

CaCO3 + heat –> CaO + CO2

Question 5

what are some of the uses of lime

Answer 5

• treating water
• treating acidic oil
• neutralising acidic waste products
• making ceramics

Question 6

what is slaked lime

Answer 6

calcium hydroxide
Ca(OH)2

Question 7

how is slaked lime made

Answer 7

by adding water to calcium oxide

Question 8

what are some of the uses of slaked lime

Answer 8

• treating water
• treating acidic soil
• neutralising acidic waste products
• making ceramics

Question 9

how is calcium carbonate used in the amnufacture of iron

Answer 9

calcium carbonate is used to remove acidic impurities from the iron. it reacts with the impurities to form molten slag

Question 10

how is calcium carbonate used in the manufacture of cement

Answer 10

powdered calcium carbonate is heated with clay to form cement