S2 Chemistry Test Flashcards
1
Q
What is Electrolysis
A
chemical decomposition produced by passing an electric current through a liquid or solution containing ions to break it down
2
Q
What Gases are present in the air
A
78.09% nitrogen, 20.95% oxygen, noble gases and carbon dioxide make the last 1%
3
Q
How do you produce carbon dioxide gas
A
You mix marble chips and hydrochloric acid
4
Q
How to test for carbon dioxide
A
Bubble the gas through lime water and it should turn colourless to cloudy
5
Q
How to speed up and slow down chemical reactions
A
Speed up - bigger concentration, smaller particles , higher temperature
Slow down - small concentration, larger particles , lower temperature
6
Q
How to produce oxygen gas
A
Hydrogen peroxide + manganese dioxide catalyst
