Chapter Review answers

HBr + H2SO4 SO2 + Br2 + H2O Did S change oxidation number?

Yes

Assign oxidation numbers to each element in this compound. KMnO₄ K = Mn = O =

+1 +7 -2

Assign oxidation numbers to each element in this compound. NO N = O =

+2 -2

Assign oxidation numbers to each element in this compound. MnO₂ Mn = O =

+4 -2

HBr + H2SO4 SO2 + Br2 + H2O What is the oxidation number of the oxidizing agent? What is the oxidation number of the reducing agent?

+6 -1

The [H+] concentration of an acetic acid solution is 1 x 10-4 mol/L. Calculate the pH of the solution?

4

2HBr + H2SO4 SO2 + Br2 + 2H2O Did H change oxidation number?

No

HBr + H2SO4 SO2 + Br2 + H2O Did O change oxidation number?

No

HBr + H2SO4 SO2 + Br2 + H2O Oxidizing agent = Reducing agent =

S Br

M ---> M+ + e- The reaction represents .

oxidation

M ---> M+ + e- Is M oxidized or reduced?

oxidized

Cu + H2O CuO + H2 This equation shows that Cu is ___. This equation shows that H2 is ___.

oxidized, reduced

M ---> M+ + e- Is M an oxidizing or reducing agent?

reducing

M ---> M+ + e- Has M lost or gained an electron?

lost

(T/F) Either oxidation or reduction can take place independently in any particular reaction.

False

The reaction 2Cu + O2 2CuO has long been called an oxidation-reaction. Copper also reacts with chlorine Cu + Cl2 CuCl2. In such a reaction:

Copper is also oxidized even though no oxygen is present.

Select the compound in which chlorine is assigned the oxidation number +5.

NaClO3

HBr + H2SO4 SO2 + Br2 + H2O Did Br change oxidation number?

Yes