Flashcards on Chemical Kinetics

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What is chemical kinetics?

Chemical kinetics is the study of the speed or rate of chemical reactions and the factors that affect it.

What are the factors that influence the rate of a chemical reaction?

The factors that influence the rate of a chemical reaction are temperature, concentration of reactants, surface area, presence of catalysts, and pressure for reactions involving gases.

Define reaction rate.

Reaction rate is the change in concentration of reactants or the formation of products per unit time.

What are the units used to express reaction rate?

The units used to express reaction rate are M/s (molarity per second) or mol/L/s (moles per liter per second).

Explain the collision theory of chemical reactions.

The collision theory states that for a reaction to occur, particles must collide with each other and possess enough energy to break bonds and form new ones.

What is activation energy?

Activation energy is the minimum energy required for a reaction to occur. It is the energy barrier that must be overcome for the reactants to form products.

How does temperature affect the rate of a chemical reaction?

An increase in temperature generally leads to an increase in the rate of a chemical reaction, as higher temperature provides particles with more energy, increasing the frequency and energy of collisions.

What is the role of catalysts in chemical reactions?

Catalysts are substances that increase the rate of a chemical reaction by providing an alternative reaction pathway with lower activation energy. They are not consumed in the reaction.

Explain the concept of reaction mechanism.

Reaction mechanism refers to the step-by-step sequence of elementary reactions by which an overall chemical reaction occurs. It provides a detailed understanding of how reactants transform into products.

What is a rate law?

A rate law is an equation that relates the rate of a reaction to the concentration of the reactants. It expresses how the rate depends on the concentrations.

What is the difference between rate constant and reaction rate?

Rate constant (k) is a constant of proportionality in the rate equation, whereas reaction rate is the actual rate at which reactants are consumed or products are formed.

What is the order of a reaction?

The order of a reaction is the sum of the exponents in the rate equation, which determines how the rate depends on the concentrations of the reactants.

How does surface area affect the rate of a chemical reaction?

An increase in surface area generally leads to an increase in the rate of a chemical reaction, as it provides more exposed surface for collisions to occur.

What is the role of enzymes in biological reactions?

Enzymes are biological catalysts that speed up chemical reactions in living organisms by lowering the activation energy required for the reactions to proceed.

How does concentration of reactants affect the rate of a chemical reaction?

An increase in the concentration of reactants generally leads to an increase in the rate of a chemical reaction, as there are more reactant particles available for collisions.

What is chemical kinetics?

Chemical kinetics is the study of the speed or rate of chemical reactions and the factors that affect it.

What are the factors that influence the rate of a chemical reaction?

The factors that influence the rate of a chemical reaction are temperature, concentration of reactants, surface area, presence of catalysts, and pressure for reactions involving gases.

Define reaction rate.

Reaction rate is the change in concentration of reactants or the formation of products per unit time.

What are the units used to express reaction rate?

The units used to express reaction rate are M/s (molarity per second) or mol/L/s (moles per liter per second).

Explain the collision theory of chemical reactions.

The collision theory states that for a reaction to occur, particles must collide with each other and possess enough energy to break bonds and form new ones.

What is activation energy?

Activation energy is the minimum energy required for a reaction to occur. It is the energy barrier that must be overcome for the reactants to form products.

How does temperature affect the rate of a chemical reaction?

An increase in temperature generally leads to an increase in the rate of a chemical reaction, as higher temperature provides particles with more energy, increasing the frequency and energy of collisions.

What is the role of catalysts in chemical reactions?

Catalysts are substances that increase the rate of a chemical reaction by providing an alternative reaction pathway with lower activation energy. They are not consumed in the reaction.

Explain the concept of reaction mechanism.

Reaction mechanism refers to the step-by-step sequence of elementary reactions by which an overall chemical reaction occurs. It provides a detailed understanding of how reactants transform into products.

What is a rate law?

A rate law is an equation that relates the rate of a reaction to the concentration of the reactants. It expresses how the rate depends on the concentrations.

What is the difference between rate constant and reaction rate?

Rate constant (k) is a constant of proportionality in the rate equation, whereas reaction rate is the actual rate at which reactants are consumed or products are formed.

What is the order of a reaction?

The order of a reaction is the sum of the exponents in the rate equation, which determines how the rate depends on the concentrations of the reactants.

How does surface area affect the rate of a chemical reaction?

An increase in surface area generally leads to an increase in the rate of a chemical reaction, as it provides more exposed surface for collisions to occur.

What is the role of enzymes in biological reactions?

Enzymes are biological catalysts that speed up chemical reactions in living organisms by lowering the activation energy required for the reactions to proceed.

How does concentration of reactants affect the rate of a chemical reaction?

An increase in the concentration of reactants generally leads to an increase in the rate of a chemical reaction, as there are more reactant particles available for collisions.

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