15. Chemical Kinetics

Catalyst

Chemical Kinetics 3.6 - Catalysis

One of the many remarkable enzymes in the human body 
is carbonic anhydrase, which catalyzes the interconversion 
of carbon dioxide and water with bicarbonate ion 
and protons. If it were not for this enzyme, the body could 
not rid itself rapidly enough of the CO2 accumulated by 
cell metabolism. The enzyme catalyzes the dehydration 
(release to air) of up to 107 CO2 molecules per second. 
Which components of this description correspond to the 
terms enzyme, substrate, and turnover number?

(c) Do catalysts
affect the overall enthalpy change for a reaction,
the activation energy, or both?

Catalysts | Kinetics | AP Chemistry | Khan Academy

Catalyst Concept 1

Why doesn’t a catalyst appear in the overall chemical equation 
for a reaction?

Catalyst Example 1

Many heterogeneous catalysts are deposited on high-surfacearea
supports. Why?

Collision Theory

Energy Diagrams, Catalysts, and Reaction Mechanisms

Which of the following statements is true regarding the energy diagram provided?&nbsp;i. The reaction is endothermic.ii. Activation energy would be less than + 10 kJ after a catalyst is added.iii. The reaction absorbs energy.iv. Activation energy would be greater than + 10 kJ after a catalyst is added.<img class="fr-dib"src="https://static.studychannel-prd.pearsonprd.tech/courses/general-chemistry/thumbnails/images/7819a17f"style="width:300px;">a) I only &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;b) II only&nbsp; &nbsp; &nbsp; c) I and III &nbsp; &nbsp; &nbsp; &nbsp; d) II, III and IV

In the following three instances, which choice is greener in a chemical process? Explain. (a) A reaction that can be run at 350 K for 12 h without a catalyst or one that can be run at 300 K for 1 h with a reusable catalyst.

Suppose that the reaction A¡products is exothermic and
has an activation barrier of 75 kJ>mol. Sketch an energy diagram
showing the energy of the reaction as a function of the
progress of the reaction. Draw a second energy curve showing
the effect of a catalyst.

Catalysis

Kinetics & the Catalyst

Comment on the following statement: “A catalyst increases 
the rate of a reaction, but it is not consumed because it 
does not participate in the reaction.”

(a) Most commercial heterogeneous catalysts are extremely
finely divided solid materials. Why is particle size
important?

Potential Energy Diagrams - Chemistry - Catalyst, Endothermic & Exothermic Reactions

14.3 Reaction Mechanisms, Catalysts, and Reaction Coordinate Diagrams | General Chemistry

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Intro to Chemical Kinetics

Chemical Kinetics is the study of factors affecting reaction rates, which examines the speed by which reactants are consumed to make products.

Average Rate of Reaction

Average (General) Rate is the change in the concentration of a compound over a period of time.

Arrhenius Equation

The Arrhenius Equation&nbsp;illustrates the temperature dependence of the rate constant k.&nbsp;

Rate Law

Rate Law represents an equation for a chemical reaction that connects the reaction rate with the concentrations or pressures of the reactants and the rate constant.&nbsp;

Factors Influencing Rates

There are 4 major factors that directly influence how fast or slow a reaction proceeds.

Stoichiometric Rate Calculations

When the rate of one compound is know, the rate of another compound is calculated through rate-to-rate comparison.

According to Collision Theory:chemical reaction is successful when 2 energetic reactants successfully collide.

Integrated Rate Law

When we include the variable of time to our Rate Law then we obtain the Integrated Rate Laws.&nbsp;

Catalyst is a substance that increases the rate of reaction by lowering the Activation Energy (Ea) of a reaction.

Instantaneous Rate

<div title="Page 1">&nbsp;Instantaneous Rate is the rate a reaction at any particular point in time.</div>

Reaction Mechanism

<div title="Page 1">A Reaction Mechanism is a step-by-step sequence of elementary steps by which an overall chemical change occurs.</div>

Half-Life

Half-Life is the time it takes for half&nbsp;of a reactant to decay in a certain time period.

Energy Diagrams

Energy Diagram represents a curved plot illustrating the energies of reactants, products and transition states of a reaction.

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