Gases in the atmosphere

Question 1

how much nitrogen is in the air?

Answer 1

78% – 80%

Question 2

how much oxygen is in the air?

Answer 2

18% – 21%

Question 3

how much carbon dioxide is in the air?

Answer 3

<0.1%

Question 4

how much noble gases are in the air?

Answer 4

<1.0%

Question 5

how much water vapour is in the air?

Answer 5

<0.1%

Question 6

how can you prove how much oxygen is in the air?

Answer 6

• relit splint

- copper reactions - the copper will react with the oxygen to form copper oxide

Question 7

how can you prove how much carbon dioxide is in the air?

Answer 7

bubble through lime water.

if carbon dioxide is present it goes cloudy white

Question 8

what is combustion?

Answer 8

chemical term for burning

Question 9

what do you need for combustion?

Answer 9

heat energy and oxygen

Question 10

what is the word equation for combustion?

Answer 10

METAL + oxygen -heat-> METALoxide

Question 11

what is observed when magnesium combusts?

Answer 11

bright white flame

Question 12

what is observed when hydrogen combusts?

Answer 12

orange flame

Question 13

what is observed when sulphur combusts?

Answer 13

blue flame

Question 14

what does carbon dioxide contain?

Answer 14

two elements and three atoms

Question 15

what do you use carbon dioxide in?

Answer 15

carbonated drinks

fire extinguishers

Question 16

How can carbon dioxide be created?

Answer 16

• burning fossil fuel

- made in the lab by thermal decomposition of a metal carbonate

Question 17

what its the word equation that shows decomposition?

Answer 17

copper carbonate -heat-> copper oxide + carbon dioxide

GREEN BLACK

Question 18

what is the reactivity series?

Answer 18

Potassium 
Sodium 
Calcium 
Magnesium 
Aluminium 
Carbon 
Zinc 
Iron 
Tin 
Lead 
Hydrogen 
Copper 
Silver 
Gold 
Platinum