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Worksheetschemistry - boys gr 12
Total questions: 12
Worksheet time: 6mins
: Ag -7 في الخلية المستخدمة لطلاء جسم بالفضة ، فلز
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A
B
D
1) What two metals are often used in electrochemical cells?
Carbon and copper
Zinc and sulfur
Zinc and carbon
Zinc and copper
An electrolytic cell uses electrical energy to drive
chemical reaction
physical reaction
no reaction
none of above
Galvanic cells convert
mechanical energy in to electrical energy
potential energy in to electrical energy
electrical energy in to chemical energy
chemical energy in to electrical energy
When water is electrolyzed, gas collected at cathode, is
sulphur
oxygen
hydrogen
sulphur dioxide
What reaction occurs at the anode?
Ag+/Ag = 0.80V
Ni2+/Ni = -0.25V
Ag+ + e- →Ag
Ag → Ag+ + e-
Ni2+ + 2e- → Ni
Ni → Ni2+ + 2e-
Which is correct to write cell notation
Anode: Zn
Cathode: Ni
Zn2+ (aq,1M) / Zn (s) // Ni (s) / Ni2+ (aq,1M)
Zn (s) /Zn2+ (aq,1M) // Ni2+ (aq,1M) / Ni (s)
Zn2+ (s,1M) / Zn (aq) // Ni (aq) / Ni2+ (s,1M)
Zn (aq) /Zn2+ (s,1M) // Ni2+ (s,1M) / Ni (aq)
Calculate standard cell potential for this equation:
Zn2+(aq) + 2e → Zn(s) Eº = – 0.76 V
Cd2+(aq) + 2e → Cd(s) Eº = – 0.40 V
Eocell = -0.36 V
Eocell = -1.16 V
Eocell = +1.16 V
Eocell = +0.36 V
State one functions of salt bridge
to maintain the movement of electron
to allowing electron to flow and complete the circuit
to separate two electrolyte
to maintain the electrical neutrality of the cell
Standard electrode potential of a half-cell is measured with reference to
a) standard hydrogen electrode with 0.500M [HCl] solution
b) standard oxygen electrode with 1.00M [HCl] solution
c) standard chlorine electrode with 1.00M [HCl] solution
d) standard hydrogen electrode with 1.00 M [HCl] solution
