C1 Facts

HideShow resource information
What percentage is N2 in the atmosphere?
78%
1 of 8
What percentage is O2 in the atmosphere?
21%
2 of 8
How long ago did Earth's atmosphere form?
4 billion years ago
3 of 8
How long ago did simple creatures form on Earth?
3 billion years ago
4 of 8
How is CO2 measured in the air?
ppm
5 of 8
What is oxidation?
when oxygen is added to a substance
6 of 8
What is reduction?
when oxygen is removed from a substance
7 of 8
What is combustion (burning)
an oxidation reaction
8 of 8

Other cards in this set

Card 2

Front

What percentage is O2 in the atmosphere?

Back

21%

Card 3

Front

How long ago did Earth's atmosphere form?

Back

Preview of the front of card 3

Card 4

Front

How long ago did simple creatures form on Earth?

Back

Preview of the front of card 4

Card 5

Front

How is CO2 measured in the air?

Back

Preview of the front of card 5
View more cards

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Air Quality resources »