C9 Chemistry of the atmosphere

C9 Chemistry of the atmosphere
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Slide 1: Slide
ChemistryUpper Secondary (Key Stage 4)GCSE

This lesson contains 23 slides, with interactive quizzes and text slides.

time-iconLesson duration is: 30 min

Items in this lesson

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
6CO2 + 6H2O -> C6H12O6 + 6O2
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