All of these changes increase the value of the rate constant for a reaction except

increasing the concentration of reactants

decreasing the activation energy

The Arrhenius equation describes the relationship between the rate constant, k, and the energy of activation, E a . k = Ae -Ea/RT In this equation, A is an empirical constant, R is the ideal-gas constant, e is the base of natural logarithms, and T is the absolute temperature. According to the Arrhenius equation,

at constant temperature, reactions with lower activation energies proceed more rapidly.

at constant temperature, reactions with lower activation energies proceed less rapidly

at constant energy of activation, reactions at lower temperatures proceed more rapidly

at constant energy of activation, reactions with smaller values of A proceed more rapidly.

What will be the effect of increasing the temperature of reactants that are known to undergo an endothermic reaction?

Both the rater of reaction and the value of the equillibrium constant increase.

The rate of reaction increases and the value of the equilibrium constant decreases.

The rate of reaction decreases adn the value of the equilibrium constant changes.

The rate of reaction increases and the value of the equilibrium constant is unchanged.

A change in temp. from 10 C to 20 C is found to double the rate of a particular chemical reaction. How did the change in temperature affect the reacting molecules?

The number of molecules above the reaction energy threshold doubled.

The average velocity of the molecules doubled

The average energy of the molecules doubled

The number of collisions per second doubled

The value for the rate constant of a reaction can generally be expected to

decrease with increasing temp only when the reaction is exothermic

increase with increasing temp only when the reaction is exothermic

Two reactions with different activation energies have the same rate at room temperature. Which statement correctly describes the rates of these two reactions at the same, higher temperature?

The reaction with the larger activation energy will be faster.

The reaction with the smaller activation energy will be faster.

The two reactions will continue to occur at the same rates.

A prediction cannot be made without additional information.

A catalyst increases the rate of a reaction by

changin the mechanism of the reaction

increasing the activation energy of the reaction.

increasing the concentration of one or more of the products.

decreasing the difference in relative energy of the reactants and products

Which statement most accurately describes the behavior of a catalyst?

A catalyst reduces the activation energy for a reaction and increases the rate of a reaction.

A catalyst increases the ΔG of a reaction and hence the forward rate

A catalyst reduces the ΔH of a reaction and hence the temperature needed to produce products.

A catalyst increases the equilibrium constnat and final product concentrations.

CHEM 109 ACS Second half

Chemistry

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MULTIPLE CHOICE QUESTION

1 min • 1 pt

A + B -> C + D
is first order in [A] and second order in [B]. If [A] is halved and [B] is doubled, the rate of the reaction will

remain the same.

be increased by a factor of 2

be increased by a factor of 4

be increased by a factor of 8

Tags

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The activation energy for a particular reaction is 83.1 kJ * mol^-1. By what factor will the rate constant increase when the temperature is increased from 50.0 C to 60.0 C?

10.0

2.53

0.927

0.395

Tags

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The half-life for the radioactive decay of ³²P is 14.2 days. How many days would be required for a sample of a radiopharmaceutical containing ³²P to decrease to 20% of its initial activity?

33.0 d

49.2 d

71.0 d

286 d

Tags

NGSS.HS-PS1-8

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

^{The forward reaction (1) is proceeding at a certain rate at some temperature and pressure. When the pressure is increased, what might we expect for the forward reaction?}

a greater rate of reaction and a greater yield of SO₃ at equillibrium

a greater rate of reaction and the same yield of SO₃ at equillibrium

a lesser rate of reaction and a smaller yield of SO₃ at equilibrium

a lesser rate of reaction and a greater yield of SO₃ at equilibriu

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a chemical reaction involving the formation of an intermediate activated complex, which step must always be exothermic?

reactants -> products

products -> reactants

reactants -> activated complex

activated complex -> products

Tags

NGSS.HS-PS1-4

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The gas-phase reaction, A₂ + B₂ -> 2AB, proceeds by bimolecular collisions between A₂ and B₂ molecules. If the concentrations of both A₂ and B₂ are doubled, the reaction rate will change by a factor of

1/2

sqrt(2)

Tags

NGSS.HS-PS1-5

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

2NO(g) + Cl₂(g) -> 2NOCl(g)
doubling the concentration of chlorine doubles the rate of reaction. Doubling the concentration of both reactants increases the rate of reaction by a factor of eight. The reaction is

first order in both NO and Cl₂

first order in NO and second order in Cl₂

second order in NO and first order in Cl₂

second order in both NO and Cl₂

Tags

NGSS.HS-PS1-5

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CHEM 109 ACS Second half

A + B -> C + D
is first order in [A] and second order in [B]. If [A] is halved and [B] is doubled, the rate of the reaction will

The activation energy for a particular reaction is 83.1 kJ * mol^-1. By what factor will the rate constant increase when the temperature is increased from 50.0 C to 60.0 C?

The half-life for the radioactive decay of ³²P is 14.2 days. How many days would be required for a sample of a radiopharmaceutical containing ³²P to decrease to 20% of its initial activity?

^{The forward reaction (1) is proceeding at a certain rate at some temperature and pressure. When the pressure is increased, what might we expect for the forward reaction?}

In a chemical reaction involving the formation of an intermediate activated complex, which step must always be exothermic?

The gas-phase reaction, A₂ + B₂ -> 2AB, proceeds by bimolecular collisions between A₂ and B₂ molecules. If the concentrations of both A₂ and B₂ are doubled, the reaction rate will change by a factor of

2NO(g) + Cl₂(g) -> 2NOCl(g)
doubling the concentration of chlorine doubles the rate of reaction. Doubling the concentration of both reactants increases the rate of reaction by a factor of eight. The reaction is

Under certain conditions, the average rate of appearance of oxygen gas in the reaction
2O₃(g) -> 3O₂(g)
is 1.2 x 10^-3 atm * s^-1. What is the average rate, expressed in atm *s^-1, for the disappearnace of O₃?

H₂O₂ + 2H⁺ + 2I^- -> I₂ + 2H₂O
is rate = k [H₂O₂] [I^-]. The overall order of the reaction is

The activity of a radioisotope is 3000 counts per minute at one time and 2736 counts per minute 48 hours later. What is the half-life of the radioisotope?

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CHEM 109 ACS Second half

A + B -> C + Dis first order in [A] and second order in [B]. If [A] is halved and [B] is doubled, the rate of the reaction will

The activation energy for a particular reaction is 83.1 kJ * mol-1. By what factor will the rate constant increase when the temperature is increased from 50.0 C to 60.0 C?

The half-life for the radioactive decay of 32P is 14.2 days. How many days would be required for a sample of a radiopharmaceutical containing 32P to decrease to 20% of its initial activity?

The forward reaction (1) is proceeding at a certain rate at some temperature and pressure. When the pressure is increased, what might we expect for the forward reaction?

In a chemical reaction involving the formation of an intermediate activated complex, which step must always be exothermic?

The gas-phase reaction, A2 + B2 -> 2AB, proceeds by bimolecular collisions between A2 and B2 molecules. If the concentrations of both A2 and B2 are doubled, the reaction rate will change by a factor of

2NO(g) + Cl2(g) -> 2NOCl(g)doubling the concentration of chlorine doubles the rate of reaction. Doubling the concentration of both reactants increases the rate of reaction by a factor of eight. The reaction is

Under certain conditions, the average rate of appearance of oxygen gas in the reaction2O3(g) -> 3O2(g)is 1.2 x 10-3 atm * s-1. What is the average rate, expressed in atm *s-1, for the disappearnace of O3?

H2O2 + 2H+ + 2I- -> I2 + 2H2Ois rate = k [H2O2] [I-]. The overall order of the reaction is

The activity of a radioisotope is 3000 counts per minute at one time and 2736 counts per minute 48 hours later. What is the half-life of the radioisotope?

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Chemistry

A + B -> C + D
is first order in [A] and second order in [B]. If [A] is halved and [B] is doubled, the rate of the reaction will

The activation energy for a particular reaction is 83.1 kJ * mol^-1. By what factor will the rate constant increase when the temperature is increased from 50.0 C to 60.0 C?

The half-life for the radioactive decay of ³²P is 14.2 days. How many days would be required for a sample of a radiopharmaceutical containing ³²P to decrease to 20% of its initial activity?

^{The forward reaction (1) is proceeding at a certain rate at some temperature and pressure. When the pressure is increased, what might we expect for the forward reaction?}

The gas-phase reaction, A₂ + B₂ -> 2AB, proceeds by bimolecular collisions between A₂ and B₂ molecules. If the concentrations of both A₂ and B₂ are doubled, the reaction rate will change by a factor of

2NO(g) + Cl₂(g) -> 2NOCl(g)
doubling the concentration of chlorine doubles the rate of reaction. Doubling the concentration of both reactants increases the rate of reaction by a factor of eight. The reaction is

Under certain conditions, the average rate of appearance of oxygen gas in the reaction
2O₃(g) -> 3O₂(g)
is 1.2 x 10^-3 atm * s^-1. What is the average rate, expressed in atm *s^-1, for the disappearnace of O₃?

H₂O₂ + 2H⁺ + 2I^- -> I₂ + 2H₂O
is rate = k [H₂O₂] [I^-]. The overall order of the reaction is