Question 9:
Diagram 8 shows a usage of ethanol in daily life.
(a) Based on Diagram 8, state the colour of the flame. [1 mark]
(b) A woman uses a make up cleanser that contains alcohol to remove oil-based make-up.
State the role of alcohol in the situation.
[1 mark]
(c) Table 4 shows the characteristics of ethanol and a hydrocarbon compound P which can be used as a fuel.
Based on Table 4, choose a fuel which is more environmental friendly.
Give your reason.
[2 marks]
(d) You want to produce alcohol at home as fuel for a spirit lamp. You are given a bowl of rice, yeast, water and an empty bottle.
Write the steps to produce the alcohol.
1. ……………..
2. ……………..
3. ……………..
4. The mixture is kept in a dark place for a week.
5. Open the bottle cap every two days.
[3 marks]
Answer:
(a) Blue
(b) Alcohol acts as a solvent to dissolve oil-based make-up.
(c) The more environmentally friendly fuel is ethanol.
Reason:
– Ethanol undergoes complete combustion, so it produces less smoke and toxic gases.
– Hydrocarbon compound P undergoes incomplete combustion which produces soot and carbon monoxide.
(d)
1. Put the rice into the empty bottle.
2. Add yeast and water into the bottle.
3. Shake or stir the mixture well and close the bottle.
Diagram 8 shows a usage of ethanol in daily life.
(a) Based on Diagram 8, state the colour of the flame. [1 mark]
(b) A woman uses a make up cleanser that contains alcohol to remove oil-based make-up.
State the role of alcohol in the situation.
[1 mark]
(c) Table 4 shows the characteristics of ethanol and a hydrocarbon compound P which can be used as a fuel.
Based on Table 4, choose a fuel which is more environmental friendly.Give your reason.
[2 marks]
(d) You want to produce alcohol at home as fuel for a spirit lamp. You are given a bowl of rice, yeast, water and an empty bottle.
Write the steps to produce the alcohol.
1. ……………..
2. ……………..
3. ……………..
4. The mixture is kept in a dark place for a week.
5. Open the bottle cap every two days.
[3 marks]
Answer:
(a) Blue
(b) Alcohol acts as a solvent to dissolve oil-based make-up.
(c) The more environmentally friendly fuel is ethanol.
Reason:
– Ethanol undergoes complete combustion, so it produces less smoke and toxic gases.
– Hydrocarbon compound P undergoes incomplete combustion which produces soot and carbon monoxide.
(d)
1. Put the rice into the empty bottle.
2. Add yeast and water into the bottle.
3. Shake or stir the mixture well and close the bottle.