CHEM 222 Midterm | Course Paper

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The questions below refer to the following system:

When cobalt(II) chloride is added to pure water, the Co2+ions hydrate. The hydrated

form then reacts with the Cl–ions to set up the equilibrium shown here.

Which statement below describes the change that the system will undergo if water is

added?

A) More chloride ions will be produced.

B) More water will be produced.

C) The equilibrium will shift to the right.

D) The color will become more blue.

E) There will be less of the hydrated cobalt ion at the new equilibrium position.

How many f orbitals have n=6?

A)2

B)7

C)10

D)5

E)18

What is reverse osmosis?

A)the application, to a concentrated solution, of a pressure that is greater than the

osmotic pressure, such that solvent flows from the concentrated solution to the dilute

solution

B)the application, to a dilute solution, of a pressure that is greater than the osmotic

pressure, such that solvent flows from the concentrated solution to the dilute solution

C)the application, to a concentrated solution, of a pressure that is greater than the

osmotic pressure, such that solute flows from the concentrated solution to the dilute

solution

D)the application, to a dilute solution, of a pressure that is greater than the osmotic

pressure, such that solute flows from the concentrated solution to the dilute solution

E)the application, to a concentrated solution, of a pressure that is greater than the

osmotic pressure, such that solvent flows from the dilute solution to the concentrated

solution

The kinetics of the reaction were studied and the following results

obtained, where the rate law is:

For a run where [A]0= 1.0 x10-3M and [B]0= 5.0 M, a plot of ln [A] versus t was found

to give a straight line with slope = -5.0 x10-2s-1.

For a run where [A]0= 1.0 x10-3M and [B]0= 10.0 M, a plot of ln [A] versus t was found

to give a straight line with slope = -7.1 x10-2s-1.

What is the value of m?

A)0

B)0.5

C)1

D)1.5

E)2

Nitric oxide, an important pollutant in air, is formed from the elements nitrogen and

oxygen at high temperatures, such as those obtained when gasoline burns in an

automobile engine. At 2000°C, K for the reaction N2(g) + O2(g) 2NO(g) is 0.01.

Predict the direction in which the system will move to reach equilibrium at 2000°C if

0.4 moles of N2, 0.1 moles of O2, and 0.08 moles of NO are placed in a 1.0-liter

container.

A) The system remains unchanged.

B) The concentration of NO will decrease; the concentrations of N2and O2will increase.

C) The concentration of NO will increase; the concentrations of N2and O2will decrease.

D) The concentration of NO will decrease; the concentrations of N2and O2will remain

unchanged.

E) More information is necessary.

Determine G° for the following reaction:

CH4(g) + 2O2(g) –> CO2(g) + 2H2O(l)

A) -581.1 kJ

B) -919.9 kJ

C) -818.5 kJ

D) -682.5 kJ

E) 131.1 kJ

Which of the following statements is incorrect?

A) A solution of ammonium chloride will have a pH less than 7.

B) A solution of potassium bromide will have a pH of 7.

C) A solution of cobalt(II) chloride will have a pH less than 7.

D) Given that the Kbof ammonia is 1.8 x 10-5and the Kaof hydrofluoric acid is 6.8 x

10-4, a solution of ammonium fluoride will have a pH of less than 7.

E) A solution of sodium phosphate will have a pH of less than 7.

Generally the vapor pressure of a liquid is related to:

I.the amount of liquid

II.atmospheric pressure

III.temperature

IV.intermolecular forces

A)I, III

B)II, III, IV

C)I, III, IV

D)III, IV

E)I, II, III, IV

Consider the following complexes:

Which can exhibit cis-trans isomerism?

A) I

B) II

C) III

D) I, II

E) I, II, III

Why is this reaction considered to be exothermic?

A)Because energy difference B is greater than energy difference C.

B)Because energy difference B is greater than energy difference A.

C)Because energy difference A is greater than energy difference C.

D)Because energy difference B is greater than energy difference C plus energy

difference A.

E)Because energy difference A and energy difference C are about equal.

Select the correct molecular structure for the given species from the choices below:

SO32¯

A)pyramidal

B)tetrahedral

C)square planar

D)octahedral

E)none of these

Select the answer that best describes an aqueous solution made from each of the

following substances:

solid sodium nitrate (NaNO3)

A) acidic

B) basic

C) neutral

D) cannot tell

E) none of these (A-D)

Which of the following are structural isomers?

A) I, III

B) II, IV

C) I, III, IV

D) II, III

E) I, II

Which of the following is indicative of the existence of strong intermolecular forces of

attraction in a liquid?

A)a very low boiling point

B)a very low viscosity

C)a very low vapor pressure

D)a very low heat of vaporization

E)a very low freezing point

The concentration of A after 10.0 minutes is

What is the wavelength of a photon of red light (in nm) whose frequency is

4.55×1014Hz?

The reaction 2NO + O2–> 2NO2obeys the rate law – = kobsd[NO]2[O2].

Which of the following mechanisms is consistent with the experimental rate law?

What is the kinetic energy of a 1.56-kg object moving at 94.0km/hr?

Write balanced equations for each of the processes, choosing from the following

substances as reactants:

BaCl2 O2 H2SO4 HNO3

C2H5OH H2O Ca(OH)2 K

Na2CrO4 KOH Pb(NO3)2

Precipitation of BaSO4from solution

A general reaction written as A + 2B –> C + 2D is studied and yields the following

data:

Determine the initial rate of B consumption ( [B]/ t) for the first trial?

NO(g) + O2(g) –>NO2(g)DH2

Write molecular equations for the following reactions:methyl substitution of benzene

Convert 4338 mL to qt. (1 L = 1.06 qt)