1
Q
Which gas burns with a squeaky pop?
A
Hydrogen
2
Q
How can we test to see if hydrogen gas is given off during a reaction?
A
Light a splint and hold it above the gas.
If you hear a squeaky pop then hydrogen is present.
3
Q
Which gas can cause the embers on a splint to relight?
A
Oxygen
4
Q
How can we test to see if oxygen is given off in a reaction?
A
Light a splint, blow it out, hold above gas and see if embers relight.
5
Q
Which gas turns lime water cloudy?
A
Carbon dioxide
6
Q
How can we check to see if carbon dioxide is given off during a chemical reaction?
A
Collect the gas and bubble it through lime water. If the lime water turns cloudy, carbon dioxide is present.
Chapter 4 - Be Reactive
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