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C9 Chemistry of the atmosphere
C9 Chemistry of the atmosphere
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Slide 1:
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Chemistry
Upper Secondary (Key Stage 4)
GCSE
This lesson contains
23 slides
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interactive quizzes
and
text slides
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Lesson duration is:
30 min
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C9 Chemistry of the atmosphere
Slide 1 - Slide
Name 4 gases in the Earth’s atmosphere.
A
Oxygen, nitrogen, carbon monoxide, water.
B
Oxygen, nitrogen, methane, water.
C
Oxygen, nitrogen, carbon dioxide, methane.
D
Oxygen, nitrogen, carbon dioxide, water.
Slide 2 - Quiz
Give the proportions of gases in the Earth’s atmosphere.
A
80% Nitrogen 20% Oxygen - small % other gases
B
80% Carbon dioxide 20% Oxygen - small % other gases
C
80% Oxygen 20% Nitrogen - small % other gases
D
80% Methane 20% Oxygen - small % other gases
Slide 3 - Quiz
Why is evidence for the Earth’s early atmosphere limited?
A
It has changed so much it is hard to tell
B
Scientists are just guessing
C
The timescale is so large 4.6 billion years ago
D
There is no evidence for it
Slide 4 - Quiz
How did the oceans form?
A
Ice caps melted and released water
B
Water vapour in the atmosphere condensed
C
Respiration of first plants released water
D
From water in the ground leaking out
Slide 5 - Quiz
Outcomes for today
Be able to explain how oxygen increased and carbon dioxide decreased from the early atmosphere until today's.
Slide 6 - Slide
As organisms evolved they changed the atmosphere in a significant way.
Algae first produced oxygen about 2.7 billion years ago and soon after this oxygen appeared in the atmosphere.
1
Over the next billion years plants evolved and the percentage of oxygen gradually increased to a level that enabled animals to evolve.
2
Algae and plants produced the oxygen that is now in the atmosphere by photosynthesis.
3
Oxygen increased in Earth's atmosphere due to photosynthesis by green plants and algae.
4
Slide 7 - Slide
Which organisms increased oxygen levels in the atmosphere?
A
Plants and animals
B
Algae and plants
C
Algae and green plants
D
Photosynthesis
Slide 8 - Quiz
How many years ago did algae start photosynthesising?
A
2.7 million
B
2.7 billion
Slide 9 - Quiz
Algae started photosynthesis, then about a billion years later _______ evolved.
A
Animals
B
Insects
C
Plants
D
Bacteria
Slide 10 - Quiz
Which process increased the oxygen levels in the atmosphere
A
plants and algae
B
photosynthesis
Slide 11 - Quiz
Photosynthesis word equation
Carbon dioxide + water -> oxygen + glucose
A
Symbol equation
6CO
2
+ 6H
2
O -> C
6
H
12
O
6
+ 6O
2
B
Photosynthesis happens inside chloroplasts in the green gel like substance called chlorophyll.
C
Slide 12 - Slide
What are the reactants of photosynthesis?
A
Carbon dioxide and water
B
Glucose and oxygen
Slide 13 - Quiz
What are the word and symbol equations for photosynthesis?
Slide 14 - Open question
Algae and plants decreased the percentage of carbon dioxide in the atmosphere by photosynthesis.
P
Carbon dioxide was also decreased by the formation (making) of sedimentary rocks
R
Carbon dioxide was also decreased by the formation (making) of fossil fuels
F
Slide 15 - Slide
What effect does photosynthesis have on the amount of carbon dioxide in the atmosphere
A
Increases the amount
B
Decreases the amount
Slide 16 - Quiz
Name three ways carbon dioxide levels in the atmosphere are reduced
Slide 17 - Open question
Which organisms increased the amount of oxygen in the Earth’s atmosphere?
Slide 18 - Open question
Write the balanced symbol equation for photosynthesis.
Slide 19 - Open question
When did oxygen first start appearing in the atmosphere and which organism was responsible?
Slide 20 - Open question
Other than photosynthesis what other factors decreased the level of carbon dioxide in the atmosphere?
Slide 21 - Open question
Describe the main changes to the atmosphere over time and the likely causes of these changes.
Slide 22 - Open question
Once completed head to Seneca learning.
There is a task set on chemistry of the atmosphere.
Once completed ensure all homework tasks are completed to (Including this week's)
Then complete extra practise questions of your own.
Slide 23 - Slide
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