Based on periodic trends, which elements in Problem $40$ (in their elemental form) would you expect to be good reducing agents?

Assign an oxidation state to each element or ion:

(a) $\mathrm{V}$

(b) $\mathrm{Mg}^{2+}$

(c) $\mathrm{Cr}^{3+}$

(d) $\mathrm{O}_2$

Assign an oxidation state to each element in each compound:

(a) $\mathrm{Na}_3 \mathrm{PO}_4$

(b) $\mathrm{Hg}_2 \mathrm{~S}$

(c) $\mathrm{Fe}(\mathrm{CN})_3$

(d) $\mathrm{NH}_4 \mathrm{Cl}$

What is the oxidation state of S in each ion?

(a) $\mathrm{SO}_4{ }^{2-}$

(b) $\mathrm{SO}_3{ }^{2-}$

(c) $\mathrm{HSO}_3^{-}$

(d) $\mathrm{HSO}_4^{-}$

Assign an oxidation state to each element in each reaction and use the change in oxidation state to determine which element is being oxidized and which element is being reduced.

(a) $\mathrm{SbCl}_5(\mathrm{~g}) \longrightarrow\mathrm{SbCl}_3(\mathrm{~g})+\mathrm{Cl}_2(\mathrm{~g})$

(b) $\mathrm{CO}(g)+\mathrm{Cl}_2(g) \longrightarrow \mathrm{COCl}_2(g)$

(c) $2 \mathrm{NO}(g)+\mathrm{Br}_2(g) \longrightarrow 2 \mathrm{BrNO}(g)$

(d) $\mathrm{H}_2(g)+\mathrm{CO}_2(g) \longrightarrow \mathrm{H}_2 \mathrm{O}(g)+\mathrm{CO}(g)$

Assign a letter to the simple statement and write the compound statement in symbols

• Having a good career is suffi cient for a fulfilling life.

Fill the blank with the term that correctly complete the sentence. Good grades are an example of _____, something external given in response to the attainment of a goal.

What is an oxidizing agent? What is a reducing agent?

Based on periodic trends, which elements would you expect to be good oxidizing agents?

(a) potassium

(b) fluorine

(c) iron

(d) chlorine

For each of the reactions in Problem $36$, identify the oxidizing agent and the reducing agent.

For each of the reactions in Problem $35$, identify the oxidizing agent and the reducing agent.

For each reaction, identify the substance being oxidized and the substance being reduced.

(a) $\mathrm{Mg}(\mathrm{s})+\mathrm{Br}_2(g) \longrightarrow \operatorname{MgBr}_2(\mathrm{~s})$

(b) $2 \mathrm{Cr}^{3+}(a q)+3 \mathrm{Mn}(s) \longrightarrow 2 \mathrm{Cr}(\mathrm{s})+3 \mathrm{Mn}^{2+}(a q)$

(c) $2 \mathrm{H}^{+}(a q)+\mathrm{Ni}(s) \longrightarrow \mathrm{H}_2(g)+\mathrm{Ni}^{2+}(a q)$

For each reaction, identify the substance being oxidized and the substance being reduced.

(a) $2 \mathrm{Sr}(\mathrm{s})+\mathrm{O}_2(g) \longrightarrow 2 \mathrm{SrO}(\mathrm{s})$

(b) $\mathrm{Ca}(\mathrm{s})+\mathrm{Cl}_2(g) \longrightarrow \mathrm{CaCl}_2(\mathrm{~s})$

(c) $\mathrm{Ni}^{2+}(a q)+\mathrm{Mg}(s) \longrightarrow \mathrm{Mg}^{2+}(a q)+\mathrm{Ni}(s)$

What substance is oxidized in each reaction?

(a) $2 \mathrm{Zn}(\mathrm{s})+\mathrm{O}_2(g) \longrightarrow 2 \mathrm{ZnO}(\mathrm{s})$

(b) $\mathrm{CH}_4(g)+2 \mathrm{O}_2(g) \longrightarrow \mathrm{CO}_2(g)+2 \mathrm{H}_2 \mathrm{O}(g)$

(c) $\mathrm{Sr}(\mathrm{s})+\mathrm{F}_2(g) \longrightarrow \mathrm{SrF}_2(\mathrm{~s})$