Factors that affect the rates of chemical reactions

Slides:



Advertisements
Similar presentations
Reaction Rates What affects the rate of reaction?.
Advertisements

Factors Affecting the Rate of a Chemical Reaction
2.4.1: Factors influencing Reaction Rates Unit 3: Chemical Kinetics.
Reaction Rate The rate of a reaction is the speed at which a reaction happens It can be measured as the 'rate of formation of product' Or the ‘rate of.
Energy Changes in Reactions
Factors affecting Reaction Rates Press the left mouse key to move on on each page.
Collision Theory and Reaction Rate. a) Collision Theory: THE HOME RUN ANALOGY: In order to hit a home run out of the park) one must: ________________________.
Kinetics and Equilibrium. Kinetics The branch of chemistry known as chemical kinetics is concerned with the rates of chemical reactions and the mechanisms.
Factors Affecting the Rate of a Chemical Reaction
Reaction Rates, Catalysts and Collision Theory. Rates of reaction The rate of a reaction measures how fast it happens. Increased reaction rate means that.
RATES OF REACTION CHAPTER 17. CHEMICAL KINETICS Branch of chemistry concerned with rates and mechanisms of chemical reactions. Reaction Rate- The speed.
Chemical Kinetics The Study of Reaction Rates. Why Such a Vast Difference in Reaction Rates? Reaction speeds can range from the very slow (rotting of.
Controlling Chemical Reactions
FACTORS THAT AFFECT RATES OF REACTION
Question of the Day ΔG determines whether or not a reaction will _____, but even a spontaneous reaction can be very _________. Day GO SLOW.
Collision Theory In order for a reaction to occur, reactant particles must collide with each other. In order for a reaction to occur, the collisions must.
Reaction Rates. Chemical Equation Review Chemical Reactions Every reaction has a chemical equation. The reaction of nitrogen monoxide with ozone produces.
Reaction Rates Collision Theory  In order for reactions to occur, particles must collide  If collisions are too gentle, no reaction occurs  If collisions.
Chemical Reactions 8 th 5.2 Rates of Chemical Reactions.
Chapter 15 – Fast and Slow Chemistry. Fast and Slow Chemistry During chemical reactions, particles collide and undergo change during which atoms are rearranged.
Kinetics & Equilibrium. Chemical Kinetics The area of chemistry that is concerned with reaction rates and reaction mechanisms is called chemical kinetics.
Reaction Rates. Rate of a Chemical Reaction: Is a measure of how quickly or slowly the reaction occurs (Science 10 Curriculum Sask Learning) To measure.
 Temperature When temperature increases, the particles move faster causing more collisions & the reaction rate increases  Simulation Simulation.
Section 3: Energy and Rates of Chemical Reactions Every reaction involves energy. Chemical reactions involve chemical energy. Energy is released in an.
Reaction rates course work
Chapter 14 & 16 Chemical Equilibrium and reaction rates.
Reaction Rate. Reaction Rate: It’s the change in the concentration of reactants per unit time as reaction proceeds. The area of chemistry that is concerned.
Reaction Kinetics Introductory lesson. Reaction Kinetics The study of the rates of reactions and the factors which affect the rates. What is a reaction.
Reaction Rates Speed matters! *Watch a Video!*. Reaction Rate Decrease in concentration of reactants with time or Increase in concentration of products.
Copyright©2000 by Houghton Mifflin Company. All rights reserved. 1 Chemical Kinetics The area of chemistry that concerns reaction rates.
 When molecules or other particles of substances collide, they may react. The speed, or rate, of a given reaction depends upon several things.
RATES OF REACTION. Rates of Reaction The rate of a chemical reaction is the speed at which the reaction occurs (i.e. speed at which the reactants are.
BIG Idea of Unit Chemicals react together in predictable ways How to name ionic and covalent compounds How to balance chemical equations How to identify.
Kaupapa / Learning Outcomes I can explain what ‘reaction rate’ means andhow to measure the rate of reaction I can explain how reactions happen due to collisions.
Reaction Rates and Le Chatelier’s Principle
Section 4 Rates of Change. Objectives Describe the factors affecting reaction rates. Describe the factors affecting reaction rates. Explain the effect.
Branch of chemistry that deals with the rates of chemical reactions TOPIC 8 Review Book.
Speed of Chemical Reaction. Introduction: * A chemical reaction changes a substance into another substance. * The speed of a chemical reaction measures.
IPS Unit 12 Chemical Equations Section 3. Energy Exchanges All chemical reactions release or absorb energy This energy can take many forms, such as heat,
Rate of Reaction. Rates of chemical reactions Reaction rate - how quickly reactants turn into products.
FACTORS THAT AFFECT THE RATE OF A REACTION. molecules are always moving i.e. they have kinetic energy July 2, Kinetic Molecular Theory State of.
CHEMICAL KINETICS. Chemical kinetics: is a branch of chemistry which deals with the rate of a chemical reaction and the mechanism by which the chemical.
Grade 7 Science Unit 2 After a physical change, the substance is still the same substance Changes in state are physical changes The substance may have.
Reactions rate and Collision Theory
FACTORS THAT AFFECT RATES OF REACTION
Created and adapted by: Mrs. Dube
5.3 - Factors that Affect Rates of Reactions
Rate of Reaction Chapter 6.2 Pages
CHEMICAL KINETICS.
Kinetics.
Define “rate,” OR give an example of a rate
CHEMICAL KINETICS.
Rates of Chemical Reactions
REACTION RATES.
REACTION RATES.
What things affect the rate of reactions?
Chapter 18 Reaction Rates
Kinetics Branch of chemistry that deals with the rates of chemical reactions TOPIC 8 Review Book.
Reaction Rates Chapter 7 Section 4.
Ms. Samayoa Birmingham community charter high school Chemistry
Factors that Affect Rate of Reaction
Kinetics Branch of chemistry that deals with the rates of chemical reactions TOPIC 8 Review Book.
Kinetics and Equlibrium
Factors that Affect Rate of Reaction
Rate Affecting Factors
Unit 4: Kinetics Collision Theory.
Concentration and Collisions
Chapter 17 Equilibrium Reversible Reactions.
Presentation transcript:

Factors that affect the rates of chemical reactions Concentration Temperature Nature of reactants Catalysts Surface Area

Concentration An increase in the concentration of one or more reactants generally increases the rate of reaction. An increase in the concentration of a reactant increases the frequency of collisions. Concentrations are usually measured in moles per liter. In a gaseous system, an increase in pressure will result in an increase in concentration, and thus an increase in the rate of reaction.

Follow the link below, read the introduction,click the forward arrow then “fire it up”. “The effect of increasing concentration on the rate of a chemical reaction”.

Temperature An increase in temperature increases the rate of all chemical reactions. An increase in temperature increases the speed (and thus the kinetic energy) of the particles, and increases not only the number of collisions per unit time, but of greater importance, the effectiveness of the collisions.

Follow the link below, read the introduction,click the forward arrow then click “temperature”. Click here to see how temperature can effect the rate of a chemical reaction.

Surface area Increasing the surface area of reactants increases their rate of reaction. In heterogeneous reactions, surface area plays an important role, For example, a given amount of zinc will react more readily with dilute hydrochloric acid if the surface area of zinc is increased by using smaller pieces.

Nature of the reactants Since bonds may be broken or formed in a reaction, the nature of the bond is an important factor affecting reaction rates. Reactions that involve negligible bond rearrangements are usually rapid at room temperature, for example, reactions of ionic substances in aqueous solutions. Reactions that involve the breaking of bonds(covalent reactions) tend to be slow at room temperature, for example, the reaction between hydrogen and oxygen

Follow the link below, read the introduction,click the forward arrow then click “Nature of Reactants”. Click here to see how the nature of reactants can effect the rate of a chemical reaction.

Catalysts Catalysts change the activation energy required and thus change the rate of reaction. A catalyst changes the mechanism of reaction to one involving less activation energy, but does not change the overall process. A catalyst does not initiate a chemical reaction.

Follow the link below, read the introduction,click the forward arrow then click “Catalysts”. Click here to see how catalysts can effect the rate of a chemical reaction. dstreib: Kinetics