Chemistry Counts! Spring 2016 Chemistry Workshop 11
The workshop is intended to be a low-pressure setting where we get to practice problems, ask any questions, and discuss
concepts and problem solving methods as a group. Have fun! Work together on whiteboards, chalkboards, or scratch paper and
then neatly write your solutions in a notebook where you keep chemistry class notes.
2. Write a balanced chemical equation for each chemical reaction:
a. Gaseous carbon monoxide reacts with hydrogen gas to form gaseous methane (CH4) and liquid water.
b. Solid lead (II) sulfide reacts with aqueous hydrochloric acid to form solid lead (II) chloride and dihydrogen sulfide
gas.
3. Use the solubility rules to determine what precipitate, if any, will form after the combination of the following
reagents:
a. Hg2(NO3)2 (aq) + CuSO4(aq)
b. K2CO3 (aq) + MgI2 (aq)
c. Ni(NO3)2 (aq) + CaCl2 (aq)
4. Balance the following equations and then write the ionic equation and the net ionic equation for each reaction:
a. ____ (NH4)2CO3 (aq) + ____ Fe2(SO4)3 (aq) → ____ Fe2(CO3)3 (s) + ____ (NH4)2SO4 (aq)
ionic:
net ionic:
b. ____ LiOH (aq) + ____ H2SO3 (aq) → ____ Li2SO3 (aq) + ____ H2O (l)
ionic:
net ionic:
8. Determine the oxidation number for each element in these ions and compounds:
a. PO43-
b. N2O3
c. CH4
9. Calculate the molarity of each solution:
a) 33.2 g of KCl in 0.895 L solution
b) 38.2 mg of KI in 112 mL of solution
c) 0.101 mol of LiNO3 in 6.4 L of solution
10. Calculate the mass of NaCl needed to make a 35 mL solution with a concentration of 1.3 M.
d. KClO2
11. A 122 mL solution of a 1.2 M sucrose solution is diluted to 500.0 mL. What is the molarity of the new solution?
12. How much of a 5.0 M sucrose solution should you use to make 85.0 mL of a 0.040 M solution?
13. Write a balanced chemical reaction for the neutralization of perchloric acid with sodium hydroxide.
14. Write a balanced chemical reaction for the neutralization of hydrobromic acid with sodium bicarbonate.
15. Which reactions are redox reactions?
a. Al(s) + 3Ag+ (aq) → Al3+ (aq) + 3Ag(s)
b. 4K (s) + O2 (g) →2K2O (s)
c. SO3 (g) + H2O (l) → H2SO4 (aq)
d. Mg (s) + Br2 (l) → MgBr2 (s)