2018年11月14日 星期三
2015年11月21日 星期六
F2 IS First Term Test Answer
Part
A Multiple Choice (30 marks)
2@
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1. B
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2. C
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3. D
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4. A
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5. A
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6. B
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7. B
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8. C
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9. B
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10. D
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11. B
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12. B
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13. D
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14. A
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15. B
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Part B Fill in the blanks (30 marks) 2@
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a. noble
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i.
respiration
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b. glowing
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j. chlorophyll
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c. burning
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k. light
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d. cobalt chloride
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l. chemical
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e. blue
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m. food/ starch
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f. pink
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n. oxygen
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g. higher
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o. respiration
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h. water vapour
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Part C Structured Questions (40 marks)
1.
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(a)
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Iodine solution
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2
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(b)
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The mixture of iodine solution and water is brown in colour
while that of iodine solution and starch solution is dark blue.
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2
2
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(c)
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The
iodine solution cannot enter the leaf cells unless the cells are killed. /
The
colour of the chlorophyll in the leaves affects our observation of the colour
of iodine solution.
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2
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2.
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(a)
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Respiration
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2
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(b)(i)
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Carbon dioxide
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2
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(ii)
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Test
the gas with lime water.
Lime
water will change from colourless to milky. /
Test
the gas with hydrogencarbonate indicator. The indicator will change from red
to yellow.
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1
2
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3.
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(a)
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A plant can be destarched by
keeping it in the dark for at least 24 hours.
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2
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(b)
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In tubes C and D
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2
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(c)
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In tubes A, C and D
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3
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(d)
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Tube A
In the dark, photosynthesis stops.
Only respiration occurs and carbon dioxide
is released.
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1
1
2
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4.
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(a)
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It shows the three conditions
for burning to take place, i.e. fuel, oxygen and a sufficiently high
temperature.
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2
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(b)
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We can remove any one of the three
necessary conditions to put out a fire.
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2
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(c)
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Carbon dioxide is released from the fire
extinguisher.
As carbon dioxide is denser than air,
it sinks and displaces the air around the
fire, hence cuts off the supply of oxygen.
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2
2
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5.
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(a)
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Ÿ Both consume oxygen;
Ÿ Both release energy / carbon dioxide /
water;
Ÿ Both involve the change of the
chemical energy in food into other forms of energy.
(any two or other reasonable answers)
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2
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(b)
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Ÿ A flame exists in burning but not in
respiration;
Ÿ Respiration is a much more complicated
process than burning;
Ÿ Respiration takes place in living cells while
burning takes place in air;
Ÿ The energy from food is released much slower
in respiration than in burning.
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4
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2014年11月15日 星期六
1st term test long Q1
題解:
當自發粉(baking powder)與水混合後會釋出Gas X, 此氣體由hydrogencarbonate indicator測試, 而顏色由紅色轉為黃色.
a. 提出氣體X是什麼?
b. 如果氣體收集並倒在蠟燭的火焰上, 會發生何事? 解釋你的答案.
c. 如果自發粉加在有水生植物的水盤內, 這會如何影響光合作用的速率? 解釋你的答案.
1st term test Long Q2
a. 在以上的實驗, 花生屬於火三角的什麼部分?
b. 舉出花生在以上實驗的能量轉變.
c. 以上實驗有一個過程發生, 當中花生儲存的能量會釋出.
i. 這個過程的名稱是什麼?
ii. 寫出一個文字方程式, 以顯示發生於花生的改變.
d. 利用以上裝置, 比較5g花生和5g餅乾的能量值, 列出3個要維持不變的變項(variable)
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