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