Gases In The Atmosphere Flashcards
What percentage of the atmosphere are the following gases:
Nitrogen
Carbon dioxide
Oxygen
Argon
Nitrogen = 78%
Carbon dioxide = 0.04%
Oxygen = 21%
Argon = nearly 1%
How can you investigate the proportion of oxygen in air
Soak iron wool in acetic acid and then push into measuring cylinder and invert the measuring cylinder into a beaker of water
Record the starting position of water
The water will rise as the iron will react with the oxygen to form iron oxide, the water will rise to fill the space that the oxygen took up
Leave the cylinder for around a week
Record the finishing position of the water
How can you show that phosphorous reacts with oxygen in the atmosphere
Place phosphorus in a tube and attach a glass syringe at either end and fill one syringe with air
Heat the phosphorous and use the syringes to pass air over it
As it reacts the amount of air in the syringe decreases
Measure the starting and final volumes of air using the scale on one of the syringes
Calculate the percentage of oxygen in the air
What formula is used to determine the percentage of oxygen in the atmosphere
Start volume - final volume / start volume X 100
What is the reaction of magnesium with oxygen
Burns with a bright white flame and produces a white powder that is magnesium oxide
Is slightly alkaline when dissolved in water
What is the reaction of hydrogen with oxygen
Produces a pale blue flame along with water
What is the reaction of sulphur with oxygen
Burns with a pale blue flame and produces Sulphur dioxide
It is acidic when dissolved in water
What is produced during the thermal decomposition of a metal carbonate
Carbon dioxide and a metal oxide
What do greenhouse gases do and give some examples
Carbon dioxide, methane, and water vapour
They absorb heat that is normally radiated into space and re-radiate it in all directions, including back towards the Earth
Why are carbon dioxide levels increasing in the atmosphere
CO2 is being released at a greater rate than it is being absorbed
