https://padlet.com/mstan7/79lubzfl4skxalj7 Made with mirth en-us 2021-08-19 04:52:24 UTC 2025-09-25 23:27:11 UTC hello@padlet.com https://padlet.net/icons/png/1f60e.png https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685875300 2021-08-19 11:32:11 UTC https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685875300 siowjiaying04 https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685875671 萧嘉瑩 SIOW JIA YING]]> 2021-08-19 11:32:46 UTC https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685875671 https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685875842 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)




]]> 2021-08-19 11:33:02 UTC https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685875842 https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685876210 2021-08-19 11:33:35 UTC https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685876210 chinhonglik04 https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685876219 2021-08-19 11:33:36 UTC https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685876219 wendymahyunnee04 https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685876440 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 ]]> 2021-08-19 11:33:52 UTC https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685876440 JunKai20 https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685881187 2021-08-19 11:38:25 UTC https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685881187 https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685881758 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]]> 2021-08-19 11:39:17 UTC https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685881758 hanyaoguan04 https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685884833 2021-08-19 11:43:10 UTC https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685884833 chinzhiwei03 https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685888042 2021-08-19 11:47:26 UTC https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685888042 seahpokjin04 https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685888910 2021-08-19 11:48:44 UTC https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685888910 seahpokjin04 https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685889460 2021-08-19 11:49:25 UTC https://padlet.com/mstan7/79lubzfl4skxalj7/wish/1685889460