Name:__________________________________

Lab: M W

Chem2A Exam 3

Monday December 12, 2016

Pg1 _________

Pg2 _________

Pg3 _________

Pg4 _________

Pg5 _________

Pg6 _________

Pg7__________

Pg8__________

Pg9__________

Total ________/100

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. H2O

b. I-

c. HOCl

d. FeBr3

e. CH3CH2COOH

f. CO2

5. Which of the following species can be a Bronsted-Lowry base?

a. Cl-

b. BH3

c. H2O

d. Na+

e. Ca(OH)2

f. 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. Al(NO3)3

b. NaHCO3

c. Cr(OH)3

d. LiOH

e. CuCO3

f. (NH4)2SO4

g. 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

23. Label the stronger acid in each pair. Which acid has the stronger conjugate base?

a. HPO42-orHCN

i. Stronger acid ____ HPO42-___________

ii. Stronger Conjugate Base___HCN__________

b. HSO4-orNH4+

i. Stronger acid _____ HSO4-__________

ii. Stronger Conjugate Base____ NH4+_________

c. H2OorHF

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

K = [Products]Ka = [H3O][OH-]pH = -log ([H3O+])

[Reactants] [H2O]2

Kw = [H3O+] [OH-] = 1x10-14 M10-pH = [H3O+]

[H3O+] = [OH-] = 1x10-7 M