2015年10月15日 星期四

F2 1st Term IS WS 02 Answers


1st Term WS 02
Submission date_____________
Name______________________
Class & no.2 _________(     )
 
7.1       What is air made up of?
B. Identifying gases
i      Words to know:

English term
Write the words again
Chinese term
1
Burning splint

燃燒中的木條
2
Glowing splint

餘燼的木條
3
Hydrogencarbonate indicator

碳酸氫鹽指示劑
4
Lime water

石灰水
5
Cobalt chloride paper

氯化鈷試紙

i      Fill in the blanks:
1        We can use a ­burning splint to test for oxygen. It relights a glowing splint.
2        We can use lime water to test for carbon dioxide. Its colour changes from colourless
to milky. We can also use hydrogencarbonate indicator to test for it.
It changes from red to yellow.
3        Water and water vapour水蒸汽 can turn dry cobalt chloride paper from blue to pink.

4        Complete the following table about how we test for certain gases

Testing material used
Test result
Oxygen
Glowing splint
The glowing splint relights


Lime water
The colour of the solution changes from colourless to milky.
Hydrogencarbonate indicator
The colour changes from red to yellow

Water vapour
Dry cobalt chloride paper
The colour changes from blue to pink



i      Short questions:
1             What gas can relight a glowing splint?  Oxygen
2             How can we test for carbon dioxide? Describe描述 the test result.
We can use hydrogencarbonate indicator to test for carbon dioxide.
The colour changes from red to yellow. / Use lime water and the colour changes from colourless to milky
3             What happens if a drop of water is put on a piece of dry cobalt chloride paper?

Its colour changes from blue to pink.

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