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Chemistry paper 2 AQA Triple
Atmosphere
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Cards (10)
Composition of the air (now)
Nitrogen
78%
Oxygen
21
%
Argon
0.9%
Other
gases
0.1%
Role of Atmosphere
Support
life
Protects
us from the
Sun
Traps
heat in
How oxygen levels increased
Algae
& primitive plants
photosynthesise
releasing
oxygen
as a
product
How CO₂ levels decreased
1. CO₂
dissolved
in the
oceans
2.
Plants
& algae photosynthesise (CO₂ is a product) and trapped in sedimentary rock
Early
Atmosphere components
Made up of
Hydrogen
, water vapour and
ammonia
Pollutants of the atmosphere
Sulfur
dioxide
Combustion of
sulfur
in fuels
Combustion
of nitrogen
Carbon
monoxide
Carbon
dioxide
Incomplete
combustion
Complete
combustion
Main greenhouse gases
CO₂
,
H₂O
, CH₄ (
Methane
)
Effects of global warming
Glaciers
melt
Sea
levels rise
Rainfall
patterns change
Greenhouse effect
Main
greenhouse
gases(carbon
dioxide,
water
vapour
and
methane)
Earth emits
infrared
radiation
This is trapped by
thick
layer of
greenhouse
gases
warming
the atmosphere up
Early atmosphere
Algae
and plants began to
photosynthesise
levels of
co2
goes down(reactant)
Oxygen
levels
increase(product)
Earth cools and water vapour
condenses
Oceans
and the
crust
form
Ammonia
reacts with oxygen to produce
nitrogen