MSU CEM 142 FINAL PREP
Three.0 grams of HNO3 (sturdy acid) are dissolved in enough water to make 2.Zero L of
solution. What is the pH of the solution?
A. .18
B. 1.32
C. 1.07
D. 1.62 - ANS-D. 1.Sixty two
A .01 M solution of an acid HX has a pH of two.Five. What does that inform you approximately
this acid?
I. It is absolutely ionized
II. It isn't always absolutely ionized
III. It is a strong acid
IV. It is a susceptible acid - ANS-D. II and IV
A 10.Zero mL sample of a .50 M solution of NaOH is introduced to 50 mL volumetric flask. The
flask is then filled to the mark with water. What is the concentration of the ensuing answer?
A. .01 M
B. .1/2 M
C. .05 M
D. 1.Zero M - ANS-A. .01 M
A beaker of water is heated from 80C to 110C. What is authentic approximately this procedure?
I. Covalent bonds are damaged
II. Covalent bonds are formed
III. Intermolecular forces are conquer
IV. Intermolecular forces are fashioned. - ANS-III. Intermolecular forces are conquer.
A piece of wood found in an archeological website was determined to have best 60% of the
carbon - 14 determined in a residing tree. The half of existence of carbon is 5730 years. How
old turned into the piece of wooden?
A. ~2200 years
B. ~ 3400 years
C. ~ 4200 years
D. ~5700 years
E. ~7600 years - ANS-C. ~ 4200 years
, A procedure occurs w/in a device. This method consequences in a decrease inside the entropy
of the gadget. Which of the following statements need to additionally be real?
I. Delta G is terrible
II. Delta G is postive
III. Delta S for the surroundings is superb
IV. Delta S for the surroundings is poor - ANS-A. I and III
A response has an enthalpy change of -105kJ. Which of the subsequent statements are actual?
I. The reaction is endothermic
II. The response is exothermic
III. The strength of the bonds in the goods are extra than within the reactants
IV. The strength of the bonds inside the reactants are greater than in the products - ANS-C. II
and III
A solute is insoluble in water. A calculation is finished to estimate that the energy of interactions
broken is ready similar to the energy of interactions shaped. Which of those statements should
be genuine?
A. The entropy of the machine might decrease
B. The entropy of the machine would increase
C. The enthalpy exchange would boom if the water were heated
D. The enthalpy change might lower if water were heated - ANS-A. The entropy of the system
could lower
A solution is ready with the aid of dissolving three.Four grams of NH3 in enough water to make
2.0 L of answer. What is the molarity of the answer?
A. .10 M
B. .20 M
C. .59 M
D.1.7 M - ANS-A. .10 M
According to Bronsted- Lowry idea, why does the reaction proven beneath manifest?
HBr + H2O → H3O+ + Br-
A. Water is a base and donates a pair of electrons to the acidic hydrogen
B. The partial poor fee at the oxygen is attracted to the partial wonderful fee on the acidic
hydrogen
C. The acid donates a proton and the base accepts the proton
D. The attention of water is continually fifty five.5 M - ANS-B. The partial poor rate on the
oxygen is drawn to the partial effective fee at the acidic hydrogen
Three.0 grams of HNO3 (sturdy acid) are dissolved in enough water to make 2.Zero L of
solution. What is the pH of the solution?
A. .18
B. 1.32
C. 1.07
D. 1.62 - ANS-D. 1.Sixty two
A .01 M solution of an acid HX has a pH of two.Five. What does that inform you approximately
this acid?
I. It is absolutely ionized
II. It isn't always absolutely ionized
III. It is a strong acid
IV. It is a susceptible acid - ANS-D. II and IV
A 10.Zero mL sample of a .50 M solution of NaOH is introduced to 50 mL volumetric flask. The
flask is then filled to the mark with water. What is the concentration of the ensuing answer?
A. .01 M
B. .1/2 M
C. .05 M
D. 1.Zero M - ANS-A. .01 M
A beaker of water is heated from 80C to 110C. What is authentic approximately this procedure?
I. Covalent bonds are damaged
II. Covalent bonds are formed
III. Intermolecular forces are conquer
IV. Intermolecular forces are fashioned. - ANS-III. Intermolecular forces are conquer.
A piece of wood found in an archeological website was determined to have best 60% of the
carbon - 14 determined in a residing tree. The half of existence of carbon is 5730 years. How
old turned into the piece of wooden?
A. ~2200 years
B. ~ 3400 years
C. ~ 4200 years
D. ~5700 years
E. ~7600 years - ANS-C. ~ 4200 years
, A procedure occurs w/in a device. This method consequences in a decrease inside the entropy
of the gadget. Which of the following statements need to additionally be real?
I. Delta G is terrible
II. Delta G is postive
III. Delta S for the surroundings is superb
IV. Delta S for the surroundings is poor - ANS-A. I and III
A response has an enthalpy change of -105kJ. Which of the subsequent statements are actual?
I. The reaction is endothermic
II. The response is exothermic
III. The strength of the bonds in the goods are extra than within the reactants
IV. The strength of the bonds inside the reactants are greater than in the products - ANS-C. II
and III
A solute is insoluble in water. A calculation is finished to estimate that the energy of interactions
broken is ready similar to the energy of interactions shaped. Which of those statements should
be genuine?
A. The entropy of the machine might decrease
B. The entropy of the machine would increase
C. The enthalpy exchange would boom if the water were heated
D. The enthalpy change might lower if water were heated - ANS-A. The entropy of the system
could lower
A solution is ready with the aid of dissolving three.Four grams of NH3 in enough water to make
2.0 L of answer. What is the molarity of the answer?
A. .10 M
B. .20 M
C. .59 M
D.1.7 M - ANS-A. .10 M
According to Bronsted- Lowry idea, why does the reaction proven beneath manifest?
HBr + H2O → H3O+ + Br-
A. Water is a base and donates a pair of electrons to the acidic hydrogen
B. The partial poor fee at the oxygen is attracted to the partial wonderful fee on the acidic
hydrogen
C. The acid donates a proton and the base accepts the proton
D. The attention of water is continually fifty five.5 M - ANS-B. The partial poor rate on the
oxygen is drawn to the partial effective fee at the acidic hydrogen
