Topic 8) Gases in the atmosphere Flashcards
1
Q
what percentages of the atmosphere is nitrogen?
A
78%
2
Q
what percentage of the atmosphere is oxygen?
A
21%
3
Q
what colour will the flame be during combustion of magnesium in oxygen?
A
white flame
4
Q
is magnesium oxide acidic, neutral, or alkaline, when dissolved in water?
A
alkaline
5
Q
what colour will the flame be during combustion of hydrogen in oxygen?
A
pale blue flame
6
Q
what colour will the flame be during combustion of sulfur in oxygen?
A
pale blue flame
7
Q
is sulfur dioxide acidic, neutral, or alkaline, when dissolved in water?
A
acidic
8
Q
what is thermal decomposition?
A
to break something down using heat
9
Q
what is the equation for the thermal decomposition of a metal carbonate?
A
metal carbonate –> metal oxide + carbon dioxide
