Oxygen In The Air And Making It Flashcards
1
Q
Portion of gases in the air
A
21% oxygen
0.04% carbon dioxide
78% nitrogen
2
Q
How do you calculate the amount of O2 in air
A
Pass 100cm3 of air over heated copper(ll)oxide
3
Q
Why must the apparatus be cooled
A
Because heated gas expands and we would read the wrong volume
4
Q
What do use to make oxygen
A
Hydrogen peroxide (H2O2) And manganese(lV)oxide
5
Q
When you burn something it air it reacts with oxygen this forms and oxide these oxides can be:
A
- acidic
- basic
6
Q
Describe magnesium when burnt in air
A
- Burns with a bright white flame
- A white powder forms and his magnesium oxide
- magnesium oxide is slightly alkali when it is dissolved in water
7
Q
Describe carbon when burnt in air
A
- Burns with a yellow/orange flame
- produces CO2
- it is slightly acidic when dissolved in water
8
Q
Describe sulfur when burned in air
A
- Burns with a pale blue flame
- produces sulphur dioxide
- slightly acidic when dissolved in water
