What is corrosion? Why do we want to prevent it?

For each of the following unbalanced oxidationreduction chemical equations, balance the equation by inspection, and identify which species is undergoing oxidation and which is undergoing reduction.

a. $\mathrm{Fe}(s)+\mathrm{O}_2(g) \rightarrow \mathrm{Fe}_2 \mathrm{O}_3(s)$
b. $\mathrm{Al}(s)+\mathrm{Cl}_2(g) \rightarrow \mathrm{AlCl}_3(s)$
c. $\mathrm{Mg}(s)+\mathrm{P}_4(s) \rightarrow \mathrm{Mg}_3 \mathrm{P}_2(s)$

Jump-starting a dead automobile battery can be dangerous if precautions are not taken because of the production of an explosive mixture of___ and gases___ in the battery.

Write two definitions of reduction. In the first definition, use the phrase oxidation state. In the second definition, use the term electrons.

To function as a good reducing agent a species must___ electrons easily.

An oxidizing agent causes the (oxidation/reduction) of another species and the oxidizing agent itself is (oxidized/reduced).

Jewelry is often manufactured by plating an expensive metal such as gold over a cheaper metal. How might such a process be set up as an electrolysis reaction ?

How is aluminum metal produced by electrolysis? Why can't simpler chemical reduction methods be used ?

What reactions go on during the recharging of an automobile battery ?

Assign oxidation states for the two elements in the compound $\mathrm{OF}_2$. Explain the rules that you use.

In the following reaction, identify the oxidizing agent and the reducing agent.

$$\mathrm{Cl}_2(g)+2 \mathrm{NaBr}(s) \rightarrow \mathrm{Br}_2(g)+2 \mathrm{NaCl}(s)$$

A. $\mathrm{Cl}_2=$ oxidizing agent, $\mathrm{NaBr}=$ reducing agent
B. $\mathrm{NaBr}=$ oxidizing agent, $\mathrm{Cl}_2=$ reducing agent
C. $\mathrm{Cl}_2=$ oxidizing agent, $\mathrm{Br}_2=$ reducing agent
D. $\mathrm{NaCl}=$ oxidizing agent, $\mathrm{NaBr}=$ reducing agent

For each of the following oxidation-reduction reactions, identify which element is oxidized and which is reduced.

a. $\mathrm{Mg}(s)+\mathrm{Br}_2(l) \rightarrow \mathrm{MgBr}_2(s)$ b. $2 \mathrm{Na}(s)+\mathrm{S}(s) \rightarrow \mathrm{Na}_2 \mathrm{~S}(s)$ c. $\mathrm{Cl}_2(\mathrm{~g})+2 \mathrm{NaBr}(a q) \rightarrow \mathrm{Br}_2(l)+2 \mathrm{NaCl}(a q)$ d. $6 \mathrm{~K}(s)+\mathrm{N}_2(g) \rightarrow 2 \mathrm{~K}_3 \mathrm{~N}(s)$

Why does an alkaline battery last longer than an acid dry cell?

What is electrolysis? What types of reactions is electrolysis capable of causing?