Chem18 at University Of The Philippines Manila | Flashcards & Summaries

Lernmaterialien für Chem18 an der University of the Philippines Manila

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TESTE DEIN WISSEN

These are known as biological cataysts.

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TESTE DEIN WISSEN

enzymes

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TESTE DEIN WISSEN

Each step of the mechanism has its own rate constant and activation energy. Often one step is much slower than the others, and the overall rate of a reaction cannot exceed the ___________________________.

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TESTE DEIN WISSEN

rate of the slowest elementary step

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TESTE DEIN WISSEN

The area of chemistry concerned with the speeds, or rates, of reactions is?

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TESTE DEIN WISSEN

chemical kinetics

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TESTE DEIN WISSEN

Why can’t the rate law for a reaction generally be deduced from the balanced equation for the reaction?

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TESTE DEIN WISSEN

The rate-determining step governs the rate law for the overall reaction.

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TESTE DEIN WISSEN

Reaction rates generally increase as temperature is ________. This is because ________ the temperature ________ the kinetic energies of molecules.

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TESTE DEIN WISSEN

increased; increasing; increases

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TESTE DEIN WISSEN

As molecules move more rapidly, they collide ________ and with ________ energy, leading to _________ reaction rates.

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TESTE DEIN WISSEN

more frequently; higher; increased

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TESTE DEIN WISSEN

_________ are agents that increase reaction rates without themselves being used up. They affect the kinds of collisions (and therefore alter ____________) that lead to reaction.

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TESTE DEIN WISSEN

Catalysts


the mechanism

Lösung ausblenden
TESTE DEIN WISSEN

In a reaction involving reactants in the gas state, how does increasing the partial pressures of the gases affect the reaction rate?

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TESTE DEIN WISSEN

The reaction rate increases.

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TESTE DEIN WISSEN

In addition to molecular orientation during collisions, another factor is usually even more important in determining whether a particular collision results in reaction. This is __________________

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TESTE DEIN WISSEN

the activation energy

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TESTE DEIN WISSEN

If chemists want to compare reactions to evaluate which ones are relatively fast and which ones are relatively slow, the quantity of interest is the rate constant. A good general rule is that a large value of k (_____ or higher) means a fast reaction and a small value of k (______ or lower) means a slow reaction.

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TESTE DEIN WISSEN

~10^9; 10 

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TESTE DEIN WISSEN

What are the factors that affect reaction rates?

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TESTE DEIN WISSEN
  • Physical state of the reactants
  • Reactant concentrations
  • Reaction temperature
  • The presence of a catalyst
Lösung ausblenden
TESTE DEIN WISSEN

For any reaction, the rate law must be determined experimentally

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TESTE DEIN WISSEN

True

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Q:

These are known as biological cataysts.

A:

enzymes

Q:

Each step of the mechanism has its own rate constant and activation energy. Often one step is much slower than the others, and the overall rate of a reaction cannot exceed the ___________________________.

A:

rate of the slowest elementary step

Q:

The area of chemistry concerned with the speeds, or rates, of reactions is?

A:

chemical kinetics

Q:

Why can’t the rate law for a reaction generally be deduced from the balanced equation for the reaction?

A:

The rate-determining step governs the rate law for the overall reaction.

Q:

Reaction rates generally increase as temperature is ________. This is because ________ the temperature ________ the kinetic energies of molecules.

A:

increased; increasing; increases

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Q:

As molecules move more rapidly, they collide ________ and with ________ energy, leading to _________ reaction rates.

A:

more frequently; higher; increased

Q:

_________ are agents that increase reaction rates without themselves being used up. They affect the kinds of collisions (and therefore alter ____________) that lead to reaction.

A:

Catalysts


the mechanism

Q:

In a reaction involving reactants in the gas state, how does increasing the partial pressures of the gases affect the reaction rate?

A:

The reaction rate increases.

Q:

In addition to molecular orientation during collisions, another factor is usually even more important in determining whether a particular collision results in reaction. This is __________________

A:

the activation energy

Q:

If chemists want to compare reactions to evaluate which ones are relatively fast and which ones are relatively slow, the quantity of interest is the rate constant. A good general rule is that a large value of k (_____ or higher) means a fast reaction and a small value of k (______ or lower) means a slow reaction.

A:

~10^9; 10 

Q:

What are the factors that affect reaction rates?

A:
  • Physical state of the reactants
  • Reactant concentrations
  • Reaction temperature
  • The presence of a catalyst
Q:

For any reaction, the rate law must be determined experimentally

A:

True

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