Name:__________________________________
Lab:
M
Chem2A Exam 3
Monday December 12, 2016
Pg1 _________
Pg2 _________
Pg3 _________
Pg4 _________
Pg5 _________
Pg6 _________
Pg7__________
Pg8__________
Pg9__________
Total ________/100
W
1. Increasing the temperature of a reaction:
a. Increases the number of collisions
b. Increases the average kinetic energy
c. Decreases the Ea
d. a and b
2. Increasing the concentration of a reaction:
a. Increases the number of collisions
b. Increases the average kinetic energy
c. Decreases the Ea
d. a and b
3. Adding a catalyst to the reaction:
a. Increases the number of collisions
b. Increases the average kinetic energy
c. Decreases the Ea
d. a and b
4. Which of the following species can be Bronsted-Lowry acids?
a.
b.
c.
d.
e.
f.
H2 O
IHOCl
FeBr3
CH3CH2COOH
CO2
5. Which of the following species can be a Bronsted-Lowry base?
a.
b.
c.
d.
e.
f.
ClBH3
H2 O
Na+
Ca(OH)2
HCOO-
6. Which mixture has the largest particle size?
a. Solution
b. Colloid
c. Suspension
7. Which mixture has the smallest particle size?
a. Solution
b. Colloid
c. Suspension
8. When the bonds of the products are stronger than the bonds of the
reactants, enthalpy of the reaction is:
a. Positive
b. Negative
c. Zero
d. >> 1
9. When K is around 1 (0.01 < K < 100)
a. Concentration of products is greater than reactants
b. Concentration of reactants is greater than products
c. Both products and reactants are equal in concentration
d. Doesn’t tell you anything about concentration
10. If a reaction is at equilibrium and you add more reactants, the
reaction:
a. Favors Products
b. Favors reactants
c. Has no effect on the reaction
11. If a reaction is at equilibrium and you constantly remove products,
the reaction:
a. Favors Products
b. Favors reactants
c. Has no effect on the reaction
12. If a reaction is at equilibrium and you increase the pressure, the
reaction:
a. Favors the side with fewer moles
b. Favors the side with more moles
c. Has no effect on the reaction
13.
For the following reaction:
H2(g) + I2(g)  2 HI(g)
0.0984
14.
If a solution contains 132 mEq/L of Na+, how many mEq of
Na+ are present in the following volumes of solution?
15. Which of the following compounds are soluble in water?
a.
b.
c.
d.
e.
f.
g.
Al(NO3)3
NaHCO3
Cr(OH)3
LiOH
CuCO3
(NH4)2SO4
Fe(OH)3
16. How is the solubility of liquid ethanol in water affected by each of
the following changes?
a. Increasing the temperature __increase________
b. Decreasing the temperature_______decrease____
c. Increasing the pressure ______no change_______
d. Decreasing the pressure________no change______
17. A glucose solution is isotonic when it contains 5% (w/v) glucose in
water. Answer the following questions.
a. If you added a glucose solution that contained 5% (w/v)
glucose would blood cells: Swell / Shrink / Maintain Shape
b. If you added a glucose solution that contained 0.01% (w/v)
glucose would blood cells: Swell / Shrink / Maintain Shape
c. If you added a glucose solution that contained 50% (w/v)
glucose would blood cells: Swell / Shrink / Maintain Shape
18. What is the weight/volume percent concentration using the given
amount of solute and total volume of solution?
19. Given the following (w/v) % or M, how many grams of solute are
contained in a 250mL solution of
20.
How many milliliters of a 2.5 M sucrose solution would be
needed to prepare each solution?
21. Write the conjugate base of each acid
a. H3O+ _____H2O________
b. H2Se ______HSe-_/ Se-2____________
c. HSO4- _____SO42-______________
d. H2O ________-OH___________
22. Label the conjugate acid-base pairs in each equation
Conjugate Acid
Conjugate Base
23. Label the stronger acid in each pair. Which acid has the
stronger conjugate base?
a. HPO42or
HCN
i. Stronger acid ____ HPO42-___________
ii. Stronger Conjugate Base___HCN__________
b. HSO4or
NH4+
i. Stronger acid _____ HSO4-__________
ii. Stronger Conjugate Base____ NH4+_________
c. H2O
or
HF
i. Stronger acid _____ HF __________
ii. Stronger Conjugate Base____ H2O _________
24. Fill in the missing terms (strong or weak) and formulas in the
following table.
Acid
Formula
Conjugate Base
Formula
a
Strong
HI
Weak
I-
b
Weak
HCN
Strong
CN-
c
Strong
HBr
Weak
Br-
d
Weak
H2CO2
Strong
HCO2-
25. Fill in the missing terms (strong or weak) and formulas in the
following table.
Base
Formula
Conjugate Acid
Formula
a
Strong
-OH
Weak
H2O
b
Weak
H2O
Strong
H3O+
c
Strong
CN-
Weak
HCN
d
Weak
ClO4-
Strong
HClO4
26. Calculate the value of [-OH] from the given [H3O+] and label
the solution as acidic, basic, or neutral
27. Calculate the pH of the solutions with the following [H3O+] and
label them as acidic or neutral or basic
28. Complete the following table with the needed [H3O+], [-OH],
and pH, and classify the solution as acidic, basic, or neutral
1.887x10-12
K = [Products]
[Reactants]
Ka = [H3O-][OH-]
[H2O]2
Kw = [H3O+] [OH-] = 1x10-14 M
[H3O+] = [OH-] = 1x10-7 M
pH = -log ([H3O+])
10-pH = [H3O+]