Homework Assignment #1

A. Give chemical formulas for the following ions:

0) chlorite ion  ClO₂^–

1) chlorate ion  ClO₃^–

2) perchlorate ion  ClO₄^–

3) chromate ion  CrO₄^2–

4) dichromate ion  Cr₂O₇^2–

5) cyanate ion  OCN^–

6) thiocyanate ion  SCN^–

7) oxalate ion  C₂O₄^2–

8) hydrogen phosphate ion  HPO₄^2–

9) dihydrogen phosphate ion  H₂PO₄^–

B. Write the names for the following ions (spelling counts!):

0) C₂H₃O₂^–  acetate ion

1) CO₃^2–  carbonate ion

2) HCO₃^–  bicarbonate ion or hydrogen carbonate ion

3) CN^–  cyanide ion

4) NO₂^–  nitrite ion

5) NO₃^–  nitrate ion

6) MnO₄^–  permanganate ion

7) PO₄^3–  phosphate ion

8) SO₃^2–  sulfite ion

9) SO₄^2–  sulfate ion

C. The following reactions can easily be balanced by inspection. Note that the phase of matter is given for all reactions. In CHM 112, keeping track of the phase of matter in reactions is important. Thus, in all reaction that you write for this class you must include the phase of matter for all components to get full credit. Do not use fractions as stoichiometric coefficients. Balance:

0) Cl₂O₅(g) + H₂O(l) → 2 HClO₃(aq)

1) V₂O₅(s) + 2 H₂(g) → V₂O₃(s) + 2 H₂O(l)

2) 4 Al(s) + 3 O₂(g) → 2 Al₂O₃(s)

3) TiCl₄(l) + 2 H₂O(l) → TiO₂(s) + 4 HCl(aq)

4) Sn(s) + 2 NaOH(aq) → Na₂SnO₂(s) + H₂(g)

5) PCl₅(g) + 4 H₂O(l) → H₃PO₄(aq) + 5 HCl(aq)

6) CH₃SH(g) + 3 O₂(g) → CO₂(g) + SO₂(g) + 2 H₂O(l)

7) 3 Zn(OH)₂(s) + 2 H₃PO₄(l) → Zn₃(PO₄)₂(s) + 6 H₂O(l)

8) 3 CH₃CH₂OH(l) + PCl₃(g) → 3 CH₃CH₂Cl(l) + H₃PO₃(s)

9) WO₃(s) + 3 H₂(g) → W(s) + 3 H₂O(l)