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Notes 2.2
Pages 35-37
Standards
CLE 3210.1.3 – Describe how enzymes regulate chemical reactions in the body.
Class Objectives: Describe the role of reactants and products in
chemical reactions. Explain the relationship between enzymes and
activation energy.
Find a partner
One of you is a cat, the other a bird.
With your partner
Brainstorm some definitions of “ENERGY”
Energy
Definition:
Types:The ability to do work.
Constant Motion
How are the states of matter related to energy?
With your partner decide the order of the following in order of most energy to least energy: Gas Liquid Solid Plasma
Chemical Reactions
Definition:
Chemical Reactions & Energy:
When one or more substances change to produce one or more different substances.
Energy is always involved (released or absorbed)
Parts of a Chemical Reaction
Coefficients
Reactants Products
Energy
Why is energy needed in a chemical reaction?
Energy is necessary to: Form bonds Break bonds
Endothermic Reactions: Absorb more energy than they release (form bonds)
Exothermic Reactions: Release more energy than they absorb (break bonds)
http://videos.howstuffworks.com/discovery/29541-assignment-discovery-energy-chemical-reactions-video.htm
Think-pair-shareLabel each chart with the correct reaction
type (endo- or exo- thermic)
Endothermic (endergonic) Exothermic (exergonic)
Birds tell your Cat:
What was the term from chapter 1 that describes the sum of all the chemical reactions in living things?
Energy & Chemical Reactions
Activation Energy:
How much energy?
The amount of energy needed to start a reaction.
For a living organism it is quite large, it would be a significant portion of their available energy.
Catalysts
Definition:
All for one and one for all?
A chemical substance that reduces the activation energy needed for a reaction.
Nope – there are many kinds of catalysts and they all work on different types of reactions.
Types of Catalysts
Elements
Catalytic Converters
Enzymes:
Nickel is used to turn vegetable oil into margarine.
Transform poisonous gasses into less harmful gasses.
A protein or RNA molecule that is a catalyst in living things.
Cats tell your Bird:
1) Summarize the parts of a chemical reaction.
Birds tell your Cat
2) Explain the role of enzymes in a chemical reaction
Did We?
CLE 3210.1.3 – Describe how enzymes regulate chemical reactions in the body.
Class Objectives: Describe the role of reactants and products in
chemical reactions. Explain the relationship between enzymes and
activation energy.
Exit Ticket
Describe the role of reactants and products in chemical reactions
Explain the relationship between enzymes and activation energy
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