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NSS Chemistry Part 3 Metals
HKCEE Past Paper Questions – Structural Questions
1.
HKCEE 1995 Q1
Rubidium (Rb) and potassium belong to the same group in the Periodic Table. The relative atomic mass of rubidium is larger then that of potassium.
(a)
Explain whether rubidium is more reactive than potassium.
(b)
Write a chemical equation for the reaction between rubidium and water. (State symbols should be given.) (c)
Suggest how rubidium can be stored safely in the laboratory.
(d)
Suggest ONE safety precaution for handling rubidium in the laboratory.
(5 marks)
1
2.
HKCEE 1995 Q6b
The table below gives some information about five metals.
Metal Abundance in the Price per kg ($) Relative resistance of earth’s corrosion
crust (%)
(1 = least resistant
Relative strength of metal
(1 = lowest
3 = highest)
4 = most resistant)
Al
170
3
1
Cu
0.0055
140
3
3
Au
0.0000004
1100000
4
2
Fe
5.0
20
1
3
Zn
(i)
8.1
0.007
160
2
2
Although gold has a very low abundance in the earth’s crust, gold was discovered by man a long time ago. Why?
(ii)
Which of the metals in the above table is the most suitable to make pipes for hot water? Explain your answer.
(iii)
(1)
Aluminium does not corrode easily. Why?
(2)
Aluminium is a principal material for making aircraft but its strength is relatively low.
Suggest how the strength of aluminium can be improved to make it suitable for making aircraft.# (iv)
(1)
Based on the information given in the table, suggest ONE factor that affects the price of a metal.
(2)
Suggest ONE other factor (not indicated in the table) that can also affect the price of a metal.
(9 marks)
2
3. HKCEE 1996 Q2
The relative molecular mass of an alkanol X is 60.0. X contains 60% of carbon by mass.
(a)
Calculate the number of moles of carbon in one mole of X and hence deduce the molecular formula
HKCEE Past Paper Questions – Structural Questions
1.
HKCEE 1995 Q1
Rubidium (Rb) and potassium belong to the same group in the Periodic Table. The relative atomic mass of rubidium is larger then that of potassium.
(a)
Explain whether rubidium is more reactive than potassium.
(b)
Write a chemical equation for the reaction between rubidium and water. (State symbols should be given.) (c)
Suggest how rubidium can be stored safely in the laboratory.
(d)
Suggest ONE safety precaution for handling rubidium in the laboratory.
(5 marks)
1
2.
HKCEE 1995 Q6b
The table below gives some information about five metals.
Metal Abundance in the Price per kg ($) Relative resistance of earth’s corrosion
crust (%)
(1 = least resistant
Relative strength of metal
(1 = lowest
3 = highest)
4 = most resistant)
Al
170
3
1
Cu
0.0055
140
3
3
Au
0.0000004
1100000
4
2
Fe
5.0
20
1
3
Zn
(i)
8.1
0.007
160
2
2
Although gold has a very low abundance in the earth’s crust, gold was discovered by man a long time ago. Why?
(ii)
Which of the metals in the above table is the most suitable to make pipes for hot water? Explain your answer.
(iii)
(1)
Aluminium does not corrode easily. Why?
(2)
Aluminium is a principal material for making aircraft but its strength is relatively low.
Suggest how the strength of aluminium can be improved to make it suitable for making aircraft.# (iv)
(1)
Based on the information given in the table, suggest ONE factor that affects the price of a metal.
(2)
Suggest ONE other factor (not indicated in the table) that can also affect the price of a metal.
(9 marks)
2
3. HKCEE 1996 Q2
The relative molecular mass of an alkanol X is 60.0. X contains 60% of carbon by mass.
(a)
Calculate the number of moles of carbon in one mole of X and hence deduce the molecular formula