'Overall reaction order' diaporamas de présentation

Chapter 15 Chemical Kinetics: The Rates of Chemical Reactions

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Rate Laws

Rate Laws. Text p. 580-585 Topic 16.1.1-16.1.3. Rate Law. An equation that gives its rate as a function of reactant concentrations. Allows chemists to propose reaction mechanisms. Each reaction has its own The general form of the rate law is Rate = k[A] x [B] y k is the rate constant

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Chapter 14 Chemical Kinetics

Chapter 14 Chemical Kinetics. Chemical kinetics is the study of: - The rates of chemical reactions - The factors (variables) that affect rates - The reaction mechanisms Variable in Reaction Rates: - Concentrations of reactants - Temperature - Surface area - Catalysts

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SAMPLE EXERCISE 14.1 Calculating an Average Rate of Reaction

SAMPLE EXERCISE 14.1 Calculating an Average Rate of Reaction. From the data given in the caption of Figure 14.3 , calculate the average rate at which A disappears over the time interval from 20 s to 40 s. Solution

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RATES OF REACTION

RATES OF REACTION. CHEMICAL KINETICS : - STUDY REACTION RATES - HOW THESE RATES CHANGE DEPEND ON CONDITIONS - DESCRIBES MOLECULAR EVENTS THAT OCCUR DURING THE REACTION. VARIABLES EFFECTING REACTION RATES : - REACTANT - CATALYST - TEMPERATURE - SURFACE AREA.

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Lecture 3

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Chemical Kinetics CHAPTER 14 Chemistry: The Molecular Nature of Matter, 6 th edition

Chemical Kinetics CHAPTER 14 Chemistry: The Molecular Nature of Matter, 6 th edition By Jesperson , Brady, & Hyslop. CHAPTER 14 Chemical Kinetics. Learning Objectives: Factors Affecting Reaction Rate : Concentration State Surface Area Temperature Catalyst

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Chemical Kinetics

Chemical Kinetics. Chapter 12. Key Definitions. Chemical Kinetics The study of the rates at which reactant and product concentrations change during a chemical reaction. Reaction rates Rates at which reactants are consumed and products are formed. . Calculating reaction rates.

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Reaction rates

Reaction rates. Chapter 14. Factors That Affect Reaction Rates. Physical state of reactants: Reactants must come in contact with one another in order for a reaction to occur. Concentration of reactants: Reactions tent to proceed faster if the reactants are present in higher concentrations.

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What is this?

What is this?. Kinetics. Reaction Rates: How fast reactions occur. How do we measure rxn rates?. Rates must be measured by experiment Indicators that a reaction is happening Color change Gas evolution Precipitate formation Heat and light Many ways to measure the rate ? Volume / time

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Chapter 15

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RATES OF REACTION

Rate of Reaction: speed at which a chemical reaction occurs ? usually expressed as the change in concentration per unit of time. Product being formed or reactant being consumed. Measurements can include mass, colour, conductivity, volume, and pressure. . RATES OF REACTION. (CHAPTER 6).

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Chemical Kinetics

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Chemical Kinetics

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Kinetics

Kinetics. A study of the rate of change (reaction rates/speeds) of a chemical reaction Factors that affect reaction rate: The nature of the reactants The surface area of the reactants The temperature Adding a catalyst Adding an inhibitor Increasing the concentration of the reactants***.

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Determining the Form of the Rate Law

Determining the Form of the Rate Law. How Data is created. Method of Initial Rates. Used to find the form of the rate law Choose one reactant to start with Find two experiments where the concentration of that reactant changes but all other reactants stay the same

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Kinetics Concept Equations Quiz- use your equation sheet For the reaction 2A + 2B ? 3C

Kinetics Concept Equations Quiz- use your equation sheet For the reaction 2A + 2B ? 3C Assume A is first order and B is first order 1. Write the (stoichiometric) rate equation 2. What is the overall reaction order? 3. Write the rate law 4. Write the integrated rate law for species A

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Entry Task: Dec 6 th Thursday

Entry Task: Dec 6 th Thursday . Question : For the general rate law, Rate = k[A] [B] 2 , what will happen to the rate of reaction if the concentration of A is tripled ? You have 5 minutes!. Agenda:. Go through the answers to Rate Law ws #1

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