Gases in the atmosphere Flashcards
% by volume of Nitrogen, N2
78.1%
% by volume of Oxygen, O2
21.0%
% by volume of Argon, Ar
0.9%
% by volume of Carbon dioxide, CO2
0.04%
Copper and determining oxygen volume in air
The copper is in excess and uses up the oxygen to form copper oxide (CuO).
Iron and determining oxygen volume in air
The iron reacts with the oxygen in the air (rusting).
As long as the iron and water are in excess, the total volume of air enclosed by the apparatus decreases by about a fifth (20%) over several days.
Phosphorus and determining oxygen volume in air
The phosphorus is lit with a hot wire.
It reacts with the oxygen in the air and causes the water level in the bell jar to rise by about 20%.
combustion in magnesium
Magnesium reacts with oxygen producing a bright white flame leaving behind a white ash of magnesium oxide.
magnesium + oxygen → magnesium oxide
2Mg (s) + O₂ (g) → 2MgO
combustion in hydrogen
Hydrogen reacts with oxygen in an explosive reaction. Dangerous, as it can lead to an explosion.
hydrogen + oxygen → water
2H₂ (g) + O₂ (g) → 2H₂O (l)
combustion in sulfur
Sulfur reacts with oxygen producing a blue flame.
sulfur + oxygen → sulfur dioxide
S (s) + O₂ (g) → SO₂ (g)
What is thermal decomposition
thermal decomposition is the process of breaking down by heating.
Heating metal carbonates, thermal decompose into…
Heating metal carbonates, thermal decompose into…metal oxides and carbon dioxide.
is CO2 a greenhouse gas?
Carbon dioxide (CO2) is a greenhouse gas.
What does the greenhouse gas CO2 absorb?
It absorbs infra-red radiation and therefore warms the atmosphere. This leads to global warming, and can cause climate change.
The test for the gas hydrogen and, the results if that gas is present
Hydrogen (H2)
Test: use a light splint
Result if present: gas pops
