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WorksheetsThe percentage of oxygen in the air
Total questions: 10
Worksheet time: 5mins
Which gas is the most abundant in the earth's atmosphere?
Nitrogen
Oxygen
Carbon dioxide
Helium
What is the percentage of oxygen in the earth's atmosphere?
10%
15%
20%
25%
What is the effect of oxygen on a lighted splint?
Oxygen extinguishes a lighted splint
Oxygen makes a lighted splint burn even more
Oxygen extinguishes a lighted splint with a pop sound
Oxygen does not have any effect on a lighted splint
What is formed when copper reacts with oxygen?
carbon dioxide and water
carbon dioxide
copper (II) oxide
copper dioxide
Which of these gases are residual gases?
Nitrogen
Carbon dioxide
Argon and Helium
All
The percentage of oxygen in the atmosphere is 20%.
How many cm3 of oxygen would you find in 50 cm3 of air?
5 cm3
10 cm3
15 cm3
20 cm3
In the experiment shown above, when should we stop passing the air in the syringe back and forth over the heated copper?
When all the copper turns black
When the volume of air remains the same in the syringes
When the copper glows inside the tube
We just pass it 6 times back and forth
The change in this experiment is:
A chemical change
An oxidation reaction
A synthesis reaction
All three
Which gas (or gases) found in the earth atmosphere can be used for welding?
Oxygen and argon
Nitrogen
nitrogen and water vapour
water vapour
Which of these gases has a variable percentage in the air?
Nitrogen
Oxygen
Carbon dioxide
Water vapour
