Atmosphere

Question 0

Carbon dioxide turns limewater..

Answer 0

Milky

Question 1

Air is made up of..

Answer 1

21% oxygen, 78% nitrogen, 1% others

Question 2

Water turns anhydrous copper sulphate … And cobalt chloride paper …

Answer 2

Blue (from white) and pink (from blue)

Question 3

Define a catylyst

Answer 3

A chemical which alters the rate of a chemical reaction without being used up

Question 4

Maganese dioxide (M2O2) speeds up the reaction of..

Answer 4

Hydrogen peroxide to water and oxygen

Question 5

Chemical equation to prepare oxygen

Answer 5

Hydrogen peroxide -> maganese dioxide -> oxygen and water

2H2O2 -> MnO2 -> O2 and 2H2O

Question 6

To prepare carbon dioxide

Answer 6

Marble chips/calcium carbonate and hydrochloric acid -> carbon dioxide and water and calcium chloride
(2HCl + CaCO3 -> CaCl2 + H2O + CO2)

Question 7

Reaction of carbon dioxide and limewater

Answer 7

Ca(OH)2 + CO2 -> CaCO3 +H2O

Question 8

Uses of carbon dioxide

Answer 8

Refrigeration, dry ice, stage effects, fizzy drinks, fire extinguishers