Energy and rates of chemical reactions
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Energy and Rates of Chemical Reactions. Chapter 4.4. Energy is needed to break bonds Law Conservation of Energy- Energy cannot be created or destroyed. It can change forms. Reactions and Energy. Exo means “exit” Thermic means “Heat” or “Energy” Define Exothermic

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Reactions and energy

Reactions and Energy


Exothermic reaction

  • Exo means “exit”

  • Thermic means “Heat” or “Energy”

  • Define Exothermic

  • How does an exothermic reaction feel?

Exothermic Reaction


Endothermic reaction

  • Endo means “go in”

  • Thermic means “heat” or “energy”

  • Define Endothermic

  • How does an endothermic reaction feel?

Endothermic Reaction


Rates of reactions

  • Activation Energy: Smallest amount of energy that is required for molecules to react

    • Striking a match

    • Friction is a source of activation energy

Rates of Reactions


Catalyst

  • Catalyst- speeds up a reaction by lowering the amount of energy needed so that a reaction can happen more easily.

    • Are not actually part of the products or reactants.

      Enzymes in the body are catalysts too!

Catalyst



Factors affecting rates of reactions

Temperature

  • At high temperatures, particles of reactants move quickly.

  • The higher the temperature……

Factors Affecting Rates of Reactions


Factors affecting rates of reactions1

Concentration

  • A measure of the amount of one substance dissolved in another substance.

  • There is a small distance between particles with a high concentration

  • The higher the concentration……

Factors Affecting Rates of Reactions


Factors affecting rates of reactions2

Surface Area

  • The amount of exposed surface of a substance

  • Grinding a solid into a powder makes a larger surface area

  • The greater the surface area……

Factors Affecting Rates of Reactions


Factors affecting rates of reactions3

Inhibitor vs. Catalysts

  • Inhibitor: substance that slows down or stops a reaction.

    • Preservatives

  • Catalyst: substance that speeds up a reaction without being permanently being changed

    • Not a reactant

    • Enzymes

    • Catalytic Converter

Factors Affecting Rates of Reactions


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