Uses of Group 2 Uses of Calcium

Question 1

Three different calcium compounds are used commonly in

Answer 1

agriculture, construction and iron extraction:

Question 2

The three calcium compounds

Answer 2

Limestone
Quicklime -
Slaked lime -

Question 3

How is limestone formed

Answer 3

this is impure calcium carbonate

Question 4

Quicklime how is it made

Answer 4

this is calcium oxide, formed by the thermal decomposition of calcium carbonate

Question 5

Slaked lime is formed how

and equation

Answer 5

this is calcium hydroxide formed when water is added to quicklime
Ca(OH)2 (s) + 2H+ (aq) → Ca2+ (aq) + 2H2O (l)

Question 6

All three materials are used in agriculture to

Answer 6

raise the pH of the soil

Question 7

Over time, the soil becomes more acidic while the optimum pH for many crops to grow is at around 6-6.5

The compounds are all ……..and react with the acids in the soil and raise the pH of the soil

Answer 7

bases

Question 8

Calcium carbonate is more commonly used in in agricultural lime as

however due to calcium carbonate being largely ………………., it acts more slowly than calcium hydroxide

Answer 8

cheaper and safer to handle

due to calcium carbonate being largely insoluble, it acts more slowly than calcium hydroxide

Question 9

Calcium compounds are also used for sulfur scrubbing which is what

Answer 9

remove sulfur dioxide from flue gases