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For the reaction below:
Zn(s) + PbSO4(aq) = Pb(s) + ZnSO4(aq)
a) Write a balanced net ionic equation for the reaction.
b) Identify which reactant is oxidized and which one is reduced.
c) Identify which reactant is the oxidizing agent and which one is the reducing agent.
d) Write balanced half reactions for the oxidation and reduction.
1. In a galvanic cell is the anode the positive or negative electrode?
2. What is the direction of electron flow in the external circuit of a galvanic cell?
3. If aluminum and tin were used as the electrodes in a galvanic cell which metal would be the anode and which metal would be the cathode. Explain why.
7. Hydrogen fuel cells:
a) Are recharged by plugging them into an electrical outlet.
b) are recharged by filling the cell up with fuel, similar to filling up a gas tank.
c) cannot be recharged.
d) are recharged by using electricity to reverse the chemical reactions that occurred in the cell.
8. The following substance(s) must be present for the corrosion of iron to occur.
a) oxygen and carbon dioxide
b) water and carbon dioxide
c) oxygen and water
d) oxygen
9. In the redox reaction of the corrosion of iron which substance is reduced?
a) iron
b) oxygen
c) iron(III) oxide
d) water
10. Generally which of the following factors decreases the rate of iron corrosion?
a) the presence of salt.
b) contact with a more reactive metal
c) acidic conditions
d) mechanical stress, such as bending
4. The cathode is:
a) the negative electrode where reduction takes place.
b) the positive electrode where reduction takes place.
c) the negative electrode where oxidation takes place.
d) the positive electrode where oxidation takes place.
5. In a Daniell cell with a zinc anode the positive charge that builds up in the zinc half-cell is neutralized by:
a) positive ions migrating towards the anode.
b) negative ions migrating towards the cathode.
c) negative ions migrating towards the anode.
d) positive zinc ions, Zn2+, being reduced to produce zinc atoms.
6. Which of the following types of batteries can be recharged?
a) alkaline dry cells
b) zinc chloride
c) nickel-cadmium (Ni-Cad)
d) mercury button battery
1.Mg(s) + Fe2+ (aq) + SO42- (aq) = Fe(s) + Mg2+ (aq)+ SO42- (aq) In the reaction represented by thechemical equation below identify which substance loses electrons and which substance gains electrons.
a) Mg gains electrons and Fe2+ loses electrons.
b) Mg loses electrons and Fe2+ gains electrons.
c) Mg2+ gains electrons and Fe loses electrons.
d) Mg2+ loses electrons and Fe gains electrons.
2. In the reaction above which substance is oxidized and which one is reduced.
a) Mg is reduced and Fe2+ is oxidized.
b) Mg2+ is oxidized and Fe2+ is reduced.
c) Mg is oxidized and Fe2+ is reduced.
d) Mg2+ is reduced and Fe is oxidized.
3. In the reaction above which substance is the reducing agent?
a) SO42-
b) Mg
c) Fe2+
d) Fe
Draw and explain the potential energy diagram for the reaction,
A B C
i) When step 1 is the rate determining step.
ii) When step 2 is the rate determining step.
How can a carboxylic acid be converted to a carboxylic acid chloride using different reagents? How will you convert the acid chlorides to
a). Other halides, and
b). The starting carboxylic acid?
fluoride is a good leaving group in aromatic nucleophilic substitution while it is poor leaving group in SN1 and SN2? Explain
What are organic compounds
hydrogenation of benzene reaction mechanism
