The Atmosphere And Oxygen Flashcards
What are the 4 main gases in the atmosphere
Nitrogen 78%
Oxygen 21%
Carbon Dioxide 0.04%
Argon 0.9%
Four ways co2 had decreased
Used as a reactant in photosynthesis
Trapped in fossil fuels
Co2 dissolved in the oceans and formed carbonate rocks
Shells and skeletons
Four ways oxygen levels increased
Bacteria evolved
used energy from to sun for photosynthesis
Oxygen was a waste product of photosynthesis
Oxygen levels rose and the first animal evolved
Why did water vapour decrease
Temp of the earth increased
Water vapour condensed to form oceans
Why did levels of nitrogen increase in the atmosphere
Nitrogen is a very stable element so built up in the atmosphere
Also the product of ammonia and oxygen
Red phosphorus experiment
Light red phosphorus
Replace bung quickly
Oxygen decreases
Water rises
To reduce error replace bung quickly and don’t wait
Copper in gas syringes practical
Push air through the copper when it is heated
Copper changes to black from brown
Volume goes down
What is fractional distillation
A technique to separate the different components of a mixture of liquids. Liquids have different boiling points
Use of oxygen
Healthcare to treat illnesses like covid
Uses of Nitrogen
Fertilizer
Uses of co2
Fire extinguishers
Uses of helium
Used in crafts that are lighter than air
Or balloons
Uses of neon
Diving gear or lasers
Uses of krypton
A filling gas for energy saving fluorescent lights
Uses of argon
Lightbulbs
What is oxygen
A reactive gas
When are oxides formed
When something reacts with oxygen
What are metal and non metal oxides
Metal oxides are basic
Non metal oxides are acidic
What are the components of the fire triangle
Heat
Fuel
Oxygen
Methods for putting out fires
Powder
Foam
Blanket
Cobalt chloride paper turns ———
Blue to pink
Anhydrous copper surface turns ———
White to blue
Test for carbon dioxide
Limewater cloudy milky or chalky
What are metal oxides and what do they do when reacting with oxygen
Metal oxides are insoluble and form alkaline solutions
What are non metal oxides and what do they do when reacting with oxygen
Soluble in oxygen and form acidic sloutions
What is combustion
Burning
