F2 IS WS01 Answers

1st Term WS 01 Submission date：_____________ Name：______________________ Class & no.：2 _________(     )

7.1       What is air made up of?

A. Composition of air

i      Words to know:

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

i      Fill in the blanks:

1        Air is a mixture of gases. It contains the following gases:

2        Nitrogen has the highest percentage in air.

3        Noble gases are a group of unreactive不活躍 and colourless無色 gases.

i      Matching:

a.       It is used to fill some food packages to extend their shelf life食用期.

b.      It is used to fill neon lights霓虹燈.

c.       It is used in some fire extinguishers滅火筒.

d.      It mixes with gas fuel氣體燃料 can burn with very high temperature for cutting metals.

e.      It is used to fill balloons.

f.        Its liquid state液態 has a very low temperature and is used to store living cells.

g.       Its solid state固態 is used to keep ice-cream cakes frozen.

h.      It is used to fill light bulbs.

i.         It is used to help patients who have breathing problems呼吸困難.

Nitrogen	Oxygen	Carbon dioxide	Helium	Argon	Neon
a, f	d, i	c, g	e	h	b