0.24 Bis2a 06.appendix a review of red/ox reactions  (Page 5/31)

Use the following equations to answer the next five questions:

i. ${\text{H}}_2\text{O(}s\text{)}⟶{\text{H}}_2\text{O(}l\text{)}$

ii. ${\text{Na}}^{+}\text{(}aq\text{)}+{\text{Cl}}^{-}\text{(}aq\text{)}{\text{Ag}}^{+}\text{(}aq\text{)}+{\text{NO}}_3{}^{-}\text{(}aq\text{)}⟶\text{AgCl(}s\text{)}+{\text{Na}}^{+}\text{(}aq\text{)}+{\text{NO}}_3{}^{-}\text{(}aq\text{)}$

iii. ${\text{CH}}_3\text{OH(}g\text{)}+{\text{O}}_2\text{(}g\text{)}⟶{\text{CO}}_2\text{(}g\text{)}+{\text{H}}_2\text{O(}g\text{)}$

iv. $2{\text{H}}_2\text{O(}l\text{)}⟶2{\text{H}}_2\text{(}g\text{)}+{\text{O}}_2\text{(}g\text{)}$

v. ${\text{H}}^{\text{+}}\text{(}aq\text{)}+{\text{OH}}^{-}\text{(}aq\text{)}⟶{\text{H}}_2\text{O(}l\text{)}$

(a) Which equation describes a physical change?

(b) Which equation identifies the reactants and products of a combustion reaction?

(c) Which equation is not balanced?

(d) Which is a net ionic equation?

Indicate what type, or types, of reaction each of the following represents:

(a) $\text{Ca(}s\text{)}+{\text{Br}}_2\text{(}l\text{)}⟶{\text{CaBr}}_2\text{(}s\text{)}$

(b) $\text{Ca}{\text{(OH)}}_2\text{(}aq\text{)}+2\text{HBr(}aq\text{)}⟶{\text{CaBr}}_2\text{(}aq\text{)}+2{\text{H}}_2\text{O(}l\text{)}$

(c) ${\text{C}}_6{\text{H}}_{12}\text{(}l\text{)}+9{\text{O}}_2\text{(}g\text{)}⟶6{\text{CO}}_2\text{(}g\text{)}+6{\text{H}}_2\text{O(}g\text{)}$

Indicate what type, or types, of reaction each of the following represents:

(a) ${\text{H}}_2\text{O(}g\text{)}+\text{C(}s\text{)}⟶\text{CO(}g\text{)}+{\text{H}}_2\text{(}g\text{)}$

(b) ${\text{2KClO}}_3\text{(}s\text{)}⟶2\text{KCl(}s\text{)}+3{\text{O}}_2\text{(}g\text{)}$

(c) $\text{Al}{\text{(OH)}}_3\text{(}aq\text{)}+3\text{HCl(}aq\text{)}⟶{\text{AlBr}}_3\text{(}aq\text{)}+3{\text{H}}_2\text{O}\text{(}l\text{)}$

(d) $\text{Pb}{\text{(}{\text{NO}}_3\text{)}}_2\text{(}aq\text{)}+{\text{H}}_2{\text{SO}}_4\text{(}aq\text{)}⟶{\text{PbSO}}_4\text{(}s\text{)}+2{\text{HNO}}_3\text{(}aq\text{)}$

Silver can be separated from gold because silver dissolves in nitric acid while gold does not. Is the dissolution of silver in nitric acid an acid-base reaction or an oxidation-reduction reaction? Explain your answer.

Determine the oxidation states of the elements in the following compounds:

(a) NaI

(b) GdCl ₃

(c) LiNO ₃

(d) H ₂ Se

(e) Mg ₂ Si

(f) RbO ₂ , rubidium superoxide

(g) HF

Determine the oxidation states of the elements in the compounds listed. None of the oxygen-containing compounds are peroxides or superoxides.

(a) H ₃ PO ₄

(b) Al(OH) ₃

(c) SeO ₂

(d) KNO ₂

(e) In ₂ S ₃

(f) P ₄ O ₆