1. Energy and Enzymes
Mrs. Stewart

2. Standards
CLE – Describe how enzymes regulate chemical reactions in the body.
Class Objectives:
Identify the reactants and products in chemical reactions.
Determine if a reaction is endothermic or exothermic
Explain the relationship between enzymes and activation energy.

3. Find a partner
One of you is a cat, the other a bird.

4. With your partner
Brainstorm the definition of “ENERGY”

5. Energy
Definition:
Types:
The ability to do work.

6. Think – Pair – Share 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

7. 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)

8. Parts of a Chemical Reaction
Coefficients
Energy
Reactants
Products

9. Example Chemical Reactions

10. What are the parts of this chemical reaction?
Cats tell your bird:
What are the parts of this chemical reaction?
Identify A, B and C C A B

11. 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)

12. Think-pair-share Label each chart with the correct reaction type (endo- or exo- thermic)
Endothermic (endergonic)
Exothermic (exergonic)

13. Practice Again

14. Birds tell your Cat: What type of reaction MAKES bonds?
Is this an endothermic or exothermic rxn?

15. Cats tell your Bird: What type of reaction BREAKS bonds?
Is this an endothermic or exothermic rxn?

16. 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.

17. Catalysts Definition:
Video – activation energy and enzymes
A chemical substance that reduces the activation energy needed for a reaction.

18. Enzymes
Enzymes:
A protein or RNA molecule that is a catalyst in living things.

20. Cats tell your Bird:
1) Explain the relationship between enzymes and chemical reactions

21. Birds tell your Cat
2) Explain the role of enzymes in a chemical reaction

22. Did We?
CLE – 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.

23. Exit Ticket
In Tay Sachs disease, the enzyme necessary to break down fat in the brain is shaped incorrectly.
What will you expect to happen in this situation?