Gases in Atmosphere

Question 1

What is the composition of our atmosphere?

Answer 1

78% Nitrogen, 21% oxygen and the rest is carbon dioxide, water vapour and noble gases

Question 2

What is combustion?

Answer 2

chemical change in which oxygen reacts with elements or compounds to produce oxides

Question 3

What type of reaction is combustion?

Answer 3

Exothermic as it gives out heat

Question 4

What happens when Magnesium reacts with oxygen?

Answer 4

Intense white flame, White powder produced (magnesium oxide)

Question 5

What happens when Hydrogen reacts with Oxygen?

Answer 5

Exothermic, Water is produced

Question 6

What happens when Sulphur reacts with oxygen?

Answer 6

Blue flame, Colourless, poisonous gas produced

Question 7

What is thermal decompisition?

Answer 7

reactions where a substance breaks down due to the action of heat

Question 8

What happens in the thermal decomposition of a metal carbonate

Answer 8

metal oxide + carbon dioxide formed

Question 9

What is the greenhouse effect?

Answer 9

Short wavelength radiation is emitted from the sun, when it strikes the earth, some is absorbed, some is re-emitted as long wavelength radiation, much of radiation is trapped and stored by greenhouse gases

Question 10

How does increases of carbon dioxide and methane levels affect global warming

Answer 10

They contribute to further radiation being trapped from the sun