F2 IS QZ 01 anwers

7.1 A

Word Translation (6 marks)

i    Write down the English terms of the following Chinese terms:

	Chinese term	English term
1	混合物	Mixture
2	氮	Nitrogen
3	氧	Oxygen
4	二氧化碳	Carbon dioxide
5	貴氣體	Noble gases
6	水蒸汽	Water vapour

Fill in the Blanks (5 marks)

1      Air is a mixture of gases. It contains nitrogen which has the highest percentage in air.

2      Oxygen is the gas which is used to help patients who have breathing problems.

3      Dry ice (solid carbon dioxide) is used to keep ice-cream cake frozen.

4      Noble gases are a group of unreactive and colourless gases. One of them is helium.

Diagram (4 marks)

Label the following diagram with appropriate words.

Nitrogen (about 78%)                Oxygen (about 21%)

                                                    Noble gases (about 0.9%)

                            Carbon dioxide (about 0.04%)

Challenging Questions (Bonus 3 marks)

1.      What gas can be used to fill light bulbs?  Argon

2.      State ONE use of nitrogen.

It is used to fill food package to extend shelf life / Liquid nitrogen is used to store living cells

3.      What will happen to the candle shown below? Why?

The candle will go out in a short time

It is because the oxygen inside the jar is used up