F2 IS QZ 02 ans

7.1BC

Word Translation (7 marks)

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

	Chinese term	English term
1	燃燒中的木條	Burning splint
2	帶星火的木條	Glowing splint
3	碳酸氫鹽指示劑	Hydrogencarbonate indicator
4	石灰水	Lime water
5	氯化鈷試紙	Cobalt chloride paper
6	未經呼吸的空氣	Unbreathed air
7	呼出的空氣	Breathed air

Fill in the Blanks (10 marks)

1      Oxygen can be tested by burning splint which burns more brightly in

oxygen. Oxygen can also relight 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. Its colour changes from red to yellow in carbon dioxide.

3      Water can turn dry cobalt chloride paper from blue to pink.

4      Unbreathed air contains more oxygen but less carbon dioxide while

        breathed air contains less oxygen and more carbon dioxide.

Challenging Questions (Bonus 3 marks)

Give THREE differences between unbreathed air and breathed air.

The unbreathed air contains more oxygen, less carbon dioxide and less water vapour

than breathed air