Consider the reaction: PCl3(g)+ Cl2(g) PCl5(g). If [PCl3] = 0.78 M, [Cl2] = 0.44 M, and [PCl5] = 0.88 at equilibrium, what is the value of K?

A) 0.39 B) 1.4 C) 2.6 D) 0.72 A) 0.39 B) 1.4 C) 2.6 D) 0.72

Consider the reaction, C2H4(g)+ H2(g)$\rightarrow$C2H6(g), where $\Delta$H = -137 kJ. How many kilojoules are released when 55.3 g of C2H4 reacts?

A) 137 kJ are released B) 270. kJ are released C) 1.13 × 103 kJ are released D) 7.58 × 103 kJ are released A) 137 kJ are released B) 270. kJ are released C) 1.13 × 103 kJ are released D) 7.58 × 103 kJ are released

Which statement concerning the reversible reaction 2 NO2(g) N2O4(g)is true?

A) NO2 is the product of the forward reaction. B) The reverse reaction produces N2O4. C) At the start of the reaction, the forward and reverse reaction rates are equal. D) As the forward reaction progresses and more N2O4 is formed, the reverse reaction rate increases. A) NO2 is the product of the forward reaction. B) The reverse reaction produces N2O4. C) At the start of the reaction, the forward and reverse reaction rates are equal. D) As the forward reaction progresses and more N2O4 is formed, the reverse reaction rate increases.

An equilibrium constant with a value of 8.0 × 106 indicates that at equilibrium

A) the reactants are favored. B) the products are favored. C) approximately equal concentrations of reactants and products are present. D) there are more reactants present than products. A) the reactants are favored. B) the products are favored. C) approximately equal concentrations of reactants and products are present. D) there are more reactants present than products.

Consider the reaction: N2(g)+ O2(g) 2 NO(g). If [N2] = 0.520 M, [O2] = 0.0662 M, and [NO] = 0.00956 at equilibrium, what is the value of K?

A) 3.60 B) 0.278 C) 377 D) 0.00265 A) 3.60 B) 0.278 C) 377 D) 0.00265

Exam 6: Energy Changes, Reaction Rates, and Equilibrium

Consider the reaction: PCl₃(g)+ Cl₂(g) PCl₅(g). If [PCl₃] = 0.78 M, [Cl₂] = 0.44 M, and [PCl₅] = 0.88 at equilibrium, what is the value of K?

(Multiple Choice)

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Question 21

A reversible reaction in which K = 9.65 × 10^-14 contains a negligible amount of reactants at equilibrium.

(True/False)

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Question 22

Walking at a brisk pace burns off about 280 Cal/h. How long would you have to walk to burn off the Calories obtained from eating a candy bar that contained 3 g of protein, 12 g of fat, and 28 g of carbohydrates?

(Multiple Choice)

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Question 23

Kinetic energy is the energy associated with movement; potential energy is the energy inherent in an object due to its position or composition.

(True/False)

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Question 24

In the energy diagram shown below, C labels the _____.

(Short Answer)

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Question 25

The $\Delta$ H for the reaction depicted by the energy diagram below is . $The \Delta H for the reaction depicted by the energy diagram below is .$

(Short Answer)

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Question 26

One step in the metabolism of glucose is depicted below. Which statement best describes how the equilibrium system would respond if the amount of dihydroxyacetone phosphate is decreased?

(Multiple Choice)

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Question 27

Bond dissociation energies are always positive numbers.

(True/False)

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Question 28

Once equilibrium is reached in a chemical reaction, reactants stop forming products.

(True/False)

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Question 29

Consider the reaction, C₂H₄(g)+ H₂(g) $\rightarrow$ C₂H₆(g), where $\Delta$ H = -137 kJ. How many kilojoules are released when 55.3 g of C₂H₄reacts?

(Multiple Choice)

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Question 30

The expression for the equilibrium constant, K, for the general reaction: a A + b B c C + d D is .

(True/False)

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Question 31

When heat is added to an exothermic equilibrium reaction, the reaction shifts to form more ____.

(Short Answer)

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Question 32

Which term correctly describes a reaction in which the energy of the products is higher than the energy of the reactants?

(Multiple Choice)

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Question 33

Which statement concerning the reversible reaction 2 NO₂(g) N₂O₄(g)is true?

(Multiple Choice)

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Question 34

An equilibrium constant with a value of 8.0 × 10⁶ indicates that at equilibrium

(Multiple Choice)

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Question 35

Which of the following is NOT a reasonable assumption about the chemical reaction whose energy diagram is depicted below?

(Multiple Choice)

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Question 36

Consider the reaction: N₂(g)+ O₂(g) 2 NO(g). If [N₂] = 0.520 M, [O₂] = 0.0662 M, and [NO] = 0.00956 at equilibrium, what is the value of K?

(Multiple Choice)

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Question 37

Increasing the temperature of a reaction mixture usually results in a decrease in the reaction rate.

(True/False)

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Question 38

Le Châtelier's principle is a general rule used to explain the effect of a change in reaction conditions on equilibrium.

(True/False)

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Question 39

Exothermic reactions involve the formation of products having lower energy than the reactants.

(True/False)

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Question 40

Showing 21 - 40 of 88

Exam 6: Energy Changes, Reaction Rates, and Equilibrium

Consider the reaction: PCl3(g)+ Cl2(g) PCl5(g). If [PCl3] = 0.78 M, [Cl2] = 0.44 M, and [PCl5] = 0.88 at equilibrium, what is the value of K?

A reversible reaction in which K = 9.65 × 10-14 contains a negligible amount of reactants at equilibrium.

Walking at a brisk pace burns off about 280 Cal/h. How long would you have to walk to burn off the Calories obtained from eating a candy bar that contained 3 g of protein, 12 g of fat, and 28 g of carbohydrates?

Kinetic energy is the energy associated with movement; potential energy is the energy inherent in an object due to its position or composition.

In the energy diagram shown below, C labels the _____.

The Δ\DeltaΔ H for the reaction depicted by the energy diagram below is ____.

One step in the metabolism of glucose is depicted below. Which statement best describes how the equilibrium system would respond if the amount of dihydroxyacetone phosphate is decreased?

Bond dissociation energies are always positive numbers.

Once equilibrium is reached in a chemical reaction, reactants stop forming products.

Consider the reaction, C2H4(g)+ H2(g) →\rightarrow→ C2H6(g), where Δ\DeltaΔ H = -137 kJ. How many kilojoules are released when 55.3 g of C2H4 reacts?

The expression for the equilibrium constant, K, for the general reaction: a A + b B c C + d D is .

When heat is added to an exothermic equilibrium reaction, the reaction shifts to form more ____.

Which term correctly describes a reaction in which the energy of the products is higher than the energy of the reactants?

Which statement concerning the reversible reaction 2 NO2(g) N2O4(g)is true?

An equilibrium constant with a value of 8.0 × 106 indicates that at equilibrium

Which of the following is NOT a reasonable assumption about the chemical reaction whose energy diagram is depicted below?

Consider the reaction: N2(g)+ O2(g) 2 NO(g). If [N2] = 0.520 M, [O2] = 0.0662 M, and [NO] = 0.00956 at equilibrium, what is the value of K?

Increasing the temperature of a reaction mixture usually results in a decrease in the reaction rate.

Le Châtelier's principle is a general rule used to explain the effect of a change in reaction conditions on equilibrium.

Exothermic reactions involve the formation of products having lower energy than the reactants.

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Consider the reaction: PCl₃(g)+ Cl₂(g) PCl₅(g). If [PCl₃] = 0.78 M, [Cl₂] = 0.44 M, and [PCl₅] = 0.88 at equilibrium, what is the value of K?

A reversible reaction in which K = 9.65 × 10^-14 contains a negligible amount of reactants at equilibrium.

The $\Delta$ H for the reaction depicted by the energy diagram below is . $The \Delta H for the reaction depicted by the energy diagram below is .$

Consider the reaction, C₂H₄(g)+ H₂(g) $\rightarrow$ C₂H₆(g), where $\Delta$ H = -137 kJ. How many kilojoules are released when 55.3 g of C₂H₄reacts?

Which statement concerning the reversible reaction 2 NO₂(g) N₂O₄(g)is true?

An equilibrium constant with a value of 8.0 × 10⁶ indicates that at equilibrium

Consider the reaction: N₂(g)+ O₂(g) 2 NO(g). If [N₂] = 0.520 M, [O₂] = 0.0662 M, and [NO] = 0.00956 at equilibrium, what is the value of K?