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Chemistry > 5.9.1.3 how oxygen increased > Flashcards

5.9.1.3 how oxygen increased Flashcards

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1
Q

What produced the oxygen that is now in the atmosphere

A

Algae and plants photosynthesising

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2
Q

The oxygen equation can be represented as..

A

Carbon dioxide + water —Light->
Glucose + oxygen

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3
Q

What is the number equation for oxygen..

A

6CO2 + 6H20 ——>
C6H12O6 + 6O2

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4
Q

How far back did algae first start to produce oxygen

A

2.7 billions years ago, the oxygen then soon after appeared in the atmosphere

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5
Q

Over the next billion of years plants..

A

Evolved and the percentage of oxygen gradually increased to a level that enabled animals to evolve.

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