chem 2

E

Biological catalysts that increase the rates of biochemical reactions are known as ________. A. substrates B. inhibitors C. proteins D. binders E. enzymes

B

Give the characteristic of a second order reaction having only one reactant. A. The rate of the reaction is inversely proportional to the concentration of the reactant. B. The rate of the reaction is proportional to the square of the concentration of the reactant. C. The rate of the reaction is proportional to the square root of the concentration of the reactant. D. The rate of the reaction is proportional to the natural logarithm of the concentration of the reactant. E. The rate of the reaction is directly proportional to the concentration of the reactant.

B

Give the direction of the reaction, if K < 1. A. The forward reaction is favored. B. The reverse reaction is favored. C. Neither direction is favored. D. If the temperature is raised, then the forward reaction is favored. E. If the temperature is raised, then the reverse reaction is favored.

A

Identify the change that will always shift the equilibrium to the left. A. remove reactant B. increase product C. remove product D. increase pressure E. increase volume

B

Of the following equilibria, only __________ will shift to the right in response to a decrease in volume or increase in overall pressure. A. H2 (g) + I2 (g) 2 HI(g) B. 2 SO2 (g) + O2 (g) 2 SO3 (g) C. 2 NH3 (g) N2 (g) + 3 H2 (g) D. 2 H2O (g) 2 H2 (g) + O2 (g) E. Both c & d

C

Whenever we add a salt to water what happens? A. The freezing point is elevated and the boiling point is lowered. B. The freezing point and the boiling point are elevated. C. The freezing point is lowered and the boiling point is elevated. D. The freezing point and the boiling point are lowered. E. None of the above.

D

Which equilibrium constant would indicate a reaction producing the most products? A. Keq = 5 x 10-20 B. Keq = 5 C. Keq = 500 D. Keq = 5 x 103

E

Which factors affect the rate of a reaction? A. Temperature B. Ea C. Molarity D. Presence of a catalyst E. All of the above

D

Which of the following affect the solubility of something in a solvent? A. Temperature B. Pressure C. Polarity D. All of the above E. None of the above

D

Which of the following are not colligative properties? A. vapor pressure rising B. freezing point elevation C. boiling point depression D. All of the above

A

Which of the following statements about soaps is false? A. The polar end is attracted to grease and oil. B. They have a polar and a nonpolar end. C. They can form micelles. D. Soaps tend to form "scum" in hard water.

B, C

Which of the following statements is TRUE? A. In general, the solubility of a solid in water decreases with increasing temperature. B. In general, the solubility of a gas in water decreases with increasing temperature. C. The solubility of a gas in water usually increases with increasing pressure. D. The solubility of an ionic solid in water decreases with increasing temperature. E. (b & c are true)

C

Which of the following statements is TRUE? A. Increasing the concentration of one or more of the reactants causes the reaction to shift to the left. B. Decreasing the temperature causes an exothermic reaction to shift left. C. Decreasing the pressure shifts in the direction that has the greater number of moles of gas particles. D. When a chemical system at equilibrium is disturbed, the system will not do anything because it is at equilibrium.

A

Which one of the following has no definite shape and takes on all of the volume of its container? A. gas B. liquid C. solid D. none of the above E. all of the above