# data[].attributes.body
Paper 1
1.A
2.A
3.B
4.A
5.D
6.B
7.B
8.C
9.C
10.B
11.C

Paper 2
1. a) cation : hydroxide ion and copper ion
anion : hydrogen ion and nitrate ion
b) hydroxide ion , because it is lower than nitrate ion in electrochemical series.
2. a) anion is negative charged ion
b) chloride ion and hydroxide ion
c) electrical charges > chemical charges
d) hydrogen gas
3. Voltmeter reading is zero, because no electric current is produced

4.a) mass of pure copper increases
b)the copper in impure copper move to pure copper
c) anode is electrode connected to negative terminal of an electrical source
d)cathode : pure argentum
Electrode : argentum sulphate solution

# data[].attributes.body
1. C
2. A
3.C
4.B
5.D
6.B
7.B
8.C
9.B
10.D
11.C

1(a) Cation: Copper II ion
Anion: Nitrate Ion
(b) CopperII ion. Higher position  at electrochemical series than hydrogen ion.

2.(a)negative ions
(b) Chloride ion / hydrocide ion
(c) electrical energy -> chemical energy
(d)Carbon gas

3. Voltmeter reading is 0. No electric current is produced.

4.(a) mass of impure copper decreses, massof pure copper increases.
(b) Purification of metal occurs.
(c) Purification is a process that affect the mass of electrode
(d) cathode: sulphate ion
electrolyte: argentum sulphate solution

# data[].attributes.body
paper 1
1. D
2. A
3. A
4. C
5. B
6. B
7. C
8. C
9. A
10. B
11. C

Paper 2
1(a) cation: copper ions , anion: hydroxide ions
(b) hydroxide ions. because it has lower electrochemical series

2(a) negative charged ion
(b) chloride ion and hydroxide ion
(c) electrical energy -> chemical energy
(d) hydrogen gas

3. the voltmeter needle won’t able to detected and reading will be 0

4(a) after 30 minutes, the anonde mass become lighter while the cathode become heavier
(b)
(c)

# data[].attributes.body
萧嘉瑩 SIOW JIA YING