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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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Presentation Transcript
reactions and energy

Energy is needed to break bonds

  • Law Conservation of Energy- Energy cannot be created or destroyed.
    • It can change forms
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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