Exp 6

Question 1

Which reaction losses electrons and which gains them

Answer 1

Oxidation reaction: loses

Reduction reaction : gains

Question 2

What’s is half a reaction

Answer 2

It’s a reaction where it shows the lose or gain of the electron
Example
A+ 2e- = A^-2
( reduction reaction)

Question 3

Did the substance go through oxidation at reducing if:
Gains 3 e-
Loses 1e-
The net charge increases
The net charge went from +3 to 0
The net charge decreased
The net charge went from -2 to -4
The net charge went from -5 to +1

Answer 3

Reduction
Oxidation
Oxidation
Reduction
Reduction
Reduction
Oxidation

Question 4

Is the half reactions oxidation reactions or reduction reactions
A(s) + 2e- = A^-2
B^-2= B(s) + 2e-
B^-3 = B^-2 = 1e-

Answer 4

Reduction
Oxidation
Oxidation

Question 5

What is the oxidation number of N in
NO
(NO2)^-

What is the oxidation number of fe in
FeO
Fe2O3

What is the oxidation number of Ag in
AG2SO4

Answer 5

+2
+3
+2
+3
+1

Question 6

Which of the substance went through reduction, oxidation
Mg(s) + O2 (g) + MgO (s)

Answer 6

The half reaction of Mg

Mg^ 0 = Mg^+2 + 2e-
Oxidation

The half reaction of O2

O2^ 0 +2e- = O^ -2
Reduction

Question 7

What id the net charge of each
Mg(s)
Zn(s)
Cu(aq)
02(g)

Answer 7

0
0
+2
0

Question 8

How do we know if the metal will displace another metal in a metal displacement reaction?

Answer 8

By the metal activity
The more reactive metal displace the lower acrivity metal

Question 9

What is the net charge of each reactant and product in the following reaction
CuSO4 + Zn(s) = Cu(s) + ZNSO4 (aq)

Answer 9

Cu (+2)
Zn(s) =0
Cu(s) =0
Zn (+2)
Cu went through reduction
Zn went through oxidation
(We only use the So4 to know the oxidizing number of the ion )

Question 10

What is the net charge of each reactant and product in the following reaction
CuSO4 + Zn(s) = Cu(s) + ZNSO4 (aq)

Answer 10

Cu (+2)
Zn(s) =0
Cu(s) =0
Zn (+2)
Cu went through reduction
Zn went through oxidation
(We only use the So4 to know the oxidizing number of the ion )