Chemsitry - earths atmosphere

Question 1

C02 holds alot of what ….

Answer 1

Heat

Question 2

Oceans started absorbing the ….. and so did the ………

Answer 2

1. C02
2. Carbonate rocks

Question 3

algea appeared to absorb …. aswell

Answer 3

C02

Question 4

Algae evolved to form ……. and …… and …… . which covered the earth and oceans .

Answer 4

1. trees
2. plants
3. Grass

Question 5

…… and …… release O2 into the atmosphere

Answer 5

1. algae
2. plants

Question 6

what 5 gasses were found on earths early atmosphere

Answer 6

1. carbon dioxide
2. amonia
3. oxeygen
4. nitorgen
5. water vapour

Question 7

How was the early earths atmosphere probably formed

Answer 7

Volcanic action

Question 8

why do scientist suggest there was no life on early earth

Answer 8

Because the volcanoes made earth to hot

Question 9

how did the level of oxygen increase .

Answer 9

because carbon dioxide was absorbed by several sources such as : carbonate rocks , ocean

Question 10

what % of nitrogen is there in the current atmosphere

Answer 10

80 %

Question 11

3 ways carbon dioxide in early atmosphere was reduced

Answer 11

The ocean absorbed it by algae then the carbonat rocks absrbed it more decreasing the levels rapidly

Question 12

What percentage of nitrogn and oxygn in the present day earths atmosphere?

Answer 12

80% nitrogen
20% oxygen

Question 13

balanced symbol equation for photosynthesis

Answer 13

6co2 + 6H2o - C6H12O6 + 6O2

Question 14

balanced word equation for photosynthesis

Answer 14

carbon dioxide + water - Glucouse + oxygen