Gases In The Atmosphere

Question 1

What is a greenhouse gas?

Answer 1

Gases, such as carbon dioxide, that rapidly heat radiated from the earth’s surface

Question 2

What is thermal decomposition?

Answer 2

Breaking down of a compound using heat

Question 3

What is a combustion?

Answer 3

A chemical reaction where a substance reacts with oxygen to form products and heat

Question 4

How much of the air does nitrogen take up?

Answer 4

78%

Question 5

How much of the air does oxygen take up?

Answer 5

21%

Question 6

What percentage of air does argon take up?

Answer 6

0.9%

Question 7

What percentage of the air does carbon dioxide?

Answer 7

0.04%

Question 8

Colour of flame for the combustion of magnesium in oxygen

Answer 8

• bright white flame and white powdery solid formed

Question 9

Equation for the complete combustion of magnesium in oxygen?

Answer 9

Mg(s)+O2(g)–>MgO(s)

Question 10

Colour of flame for the combustion of sulfur in oxygen?

Answer 10

Blue flame

Question 11

Equation for complete combustion of sulfur in oxygen?

Answer 11

S(s)+O2(g)—>SO2(g)

Question 12

Colour of flame for the combustion of hydrogen in oxygen

Answer 12

Pale blue flame

Question 13

Equation for complete combustion of hydrogen in oxygen?

Answer 13

2H2(g)+O2(g)—>2H20(l)

Question 14

Equation for calculating the percentage of oxygen in air

Answer 14

Volume of air at the start-volume of air at end divided volume of air at the start