Calcium

Question 1

Extraction of Calcium

Answer 1

Through Electrolytic reduction.
The cathode consist of an Iron rod while the anode is of graphite.

Question 2

Physical properties of Calcium

Answer 2

1. Silvery-grey solid
2. Malleable and ductile
3. Good conductor of heat and electricity
4. High Melting point of 851°C

Question 3

Chemical properties of Calcium

Answer 3

1. Reaction with air: when calcium is heated in air, it burns with a brick-red flame to form calcium oxide.
2. Reaction with non-metals: on heating it combines directly with non-metals.
3. Reaction with water: it reacts slowly with cold water and rapidly with warm water to form calcium hydroxide and hydrogen
4. Reacts vigorously with acids to displace hydrogen

Question 4

Test for calcium

Answer 4

Calcium compounds give an orange-red colour to a non-luminous flame.
If brick-red flame is viewed through a blue glass and the flame appears green, it shows calcium is present.