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