Homework 7.  Chapter 7

1.    Which of the following is a combination reaction?

a)       Cu2+(aq) + Fe(s) --> Fe2+(aq)  + Cu(s)

b)       MgO(s) + CO2(g) --> MgCO3(s)

c)       Pb(NO3)2(aq) + CaCl2(aq) --> PbCl2(s) + Ca(NO3)2(aq)

d)       HNO3(aq) + KOH(aq) --> KNO3(aq) + H2O(l)

2.    Which of the following is reduction-oxidation (Redox) reaction?

a)       Zn(s) + CuSO4(aq) --> ZnSO4(aq) + Cu(s)

b)       BaCl2(aq) + K2SO4(aq) --> BaSO4(s) + 2KCl(aq)

c)       HNO3(aq) + KOH(aq) --> KNO3(aq) + H2O(l)

d)    CaSO3(s) + 2HCl(aq) -->   CaCl2(aq) + H2O(l) + SO2(g)

3. Which of the following is a combustion reaction?

a)       Zn(s) + CuSO4(aq) --> ZnSO4(aq) + Cu(s)

b)       BaCl2(aq) + K2SO4(aq) --> BaSO4(s) + 2KCl(aq)

c)       HNO3(aq) + KOH(aq) --> KNO3(aq) + H2O(l)

d)       C6H12O6(s) + 6O2(g) --> 6CO2(g) + 6H2O(l)

e)       CaSO3(s) + 2HCl(aq) -->   CaCl2(aq) + H2O(l) + SO2(g)

4.        Solution with a solid material that separates from a solution when its solubility is exceeded is called:

a.  supersaturated                        b. saturated           d.  unsaturated     c. a precipitate

5.        Which one of the following processes cannot separate solute from solvent in a true solution?

a. chromatography   b. filtration   c.  boiling              d. adsorption  e. evaporation

6.        The number of moles of a gas dissolved in a liquid at a given temperature is proportional to the partial

         pressure of the gas. What is this law called?

a. Dalton's Law             b. Henry's Law      c. The Tyndall Law    d.  Raoult's Law  e. Boyle's Law

7.        Calculate the concentration (% W/V) of NaCl solution that was made by dissolving 15.0 g of sodium

       chloride in enough water to make 300.0 mL of solution.

a. 50.0% (W/V)             b.  0.0500% (W/V)   c. 0.356% (W/V)  d. 35.6% (W/V)   e.  5.00% (W/V)

8.        How many milliliters of 0.1250 M KCl solution contain 2.330 g of KCl? [Use formula weight: KCl, 74.55 g/mol]

a. 20.50 mL b. 26.95 mL c. 25.00 mL d. 1.500 mL e. 250.0 mL

9.        What concentration term is defined as the number of moles of solute per kilogram of solvent in a solution?

a. normality     b.  osmolarity    c.  % (W/V)     d.  molarity    e.   molality

10.     Calculate the molarity of 2.00 L of solution that contains 200.0 g of NaOH. [Use formula weight: NaOH, 40.0 g/mol]

a. 40.0 M    b. 4.00 M    c. 0.250 M    d. 2.50 M    e. 25.0 M

11.     If the concentration of Mg2+ in solution is 3.0 x 10-3 M, what is its concentration expressed in meq/L?

a. 6.0 meq/L     b. 3.0 meq/L    c. 1.5 meq/L      d.   6.0 x 10-6 meq/L   e.   1.5 x 10-6 meq/L

12.     Calculate the molarity of a solution if 300.0 mL of it contains 16.8 g of KNO3. [Use formula weight: KNO3, 101.11 g/mol ]

      a.  1.50 M b.  1.21 M   c.  0.554 M     d   0.554 m 

13.     What is the molarity of 50.0 mL of a 0.660 M NaOH solution after it has been diluted to 450.0 mL?

 a.  1.5 M        b.  1.55 M   c.  0.0733 M     d   0.660 m

14.     Calculate the osmolarity of a 2.0 x 10-3 M Na3PO4 solution. Na3PO4 is an ionic compound and produces

        an electrolytic solution.

                a.  2.0 x 10-3                  b.  4.0 x 10-3      c.  6.0 x 10-3     d.  8.0 x 10-3

15.     Calculate the osmotic pressure of a 6.0 x 10-2 M solution of NaCl at 20°C (293K).

a.  3.8  atm      b.  5.8  atm             c. 2.9 atm      d. 8.7 atm