Question : 31.Chemical equilibrium reached in a system when a.complete conversion of reactants : 1309620

 

 

31.Chemical equilibrium is reached in a system when

a.complete conversion of reactants to products has occurred

b.reactant and product concentrations are equal

c.reactants are being consumed at the same rate they are being produced

d.more than one correct response

e.no correct response

 

 

 

32.In writing an equilibrium constant expression, which of the following is incorrect?

a.Concentrations are always expressed in molarities.

b.Product concentrations are always placed in the numerator of the expression.

c.Concentrations of pure solids and pure liquids are always placed in the denominator of the expression.

d.More than one correct response.

e.No correct response.

 

 

 

33.CO2 and H2 are allowed to react until equilibrium is established as follows:

Which of the following changes will cause the equilibrium position to shift to the right?

a.increase in the concentration of H2

b.decrease in the concentration of CO

c.decrease in the concentration of CO2

d.more than one correct response

e.no correct response

 

 

 

a.Concentration of N2 will increase.

b.Heat will be generated.

c.Concentration of H2 will decrease.

d.More than one correct response.

e.No correct response.

 

 

 

35.For which of the following equilibrium systems will the equilibrium position shift to the left when a stress of increased pressure (from a volume decrease) is applied?

a.

b.

c.

d.more than one correct response

e.no correct response

 

 

 

Use the following to answer the questions below:

 

In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices

a) All three statements are true.

b) Two of the three statements are true.

c) Only one of the statements is true.

d) None of the statements is true.

 

36.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) All chemical systems will reach equilibrium if enough time elapses.

(2) A substance that functions as a reducing agent is, itself, oxidized.

(3) In a slow reaction, the activation energy is far greater than the average energy content of the reacting particles.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

37.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) A chemical system reaches equilibrium at the instant when the rate of formation of products becomes zero.

(2) One reactant and two or more products is a general characteristic of decomposition reactions.

(3) Catalysts increase reaction rate by providing an alternate reaction pathway with a higher activation energy.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

38.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) The collision between two reactant molecules does not always result in the formation of reaction products.

(2) The substance oxidized in a reaction may be either a reactant or a product.

(3) At chemical equilibrium, the concentrations of reactants and products cease to change.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

39.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) The only information needed to write an equilibrium constant expression is a balanced chemical equation with physical state information for the reaction of concern.

(2) The oxidation number of sulfur is the same in the species H2SO4 and SO42-.

(3) Increasing the concentration of a reactant makes collisions between the reactant and other reactants less likely because of “more crowded conditions.”

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.

 

 

 

40.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:

(1) Oxidation and reduction are complementary processes that always occur together.

(2) For a system at chemical equilibrium, decreasing the concentration of a reactant will always shift the equilibrium to the right.

(3) The reactants in a combination reaction must be elements.

a.All three statements are true.

b.Two of the three statements are true.

c.Only one of the statements is true.

d.None of the statements is true.