1. P 34 Compare and Contrast: Endergonic vs Exergonic
9 October 2019
P 34 Compare and Contrast: Endergonic vs Exergonic
P 35 Chemical Reactions

2. Chemical Reactions

3. Change one set of chemicals into another set of chemicals
Chemical Reactions
Change one set of chemicals into another set of chemicals

4. Chemical Reaction Reactants The “ingredients” Products The “cookies”
The elements or compounds that go into a chemical reaction.
The “ingredients”
Products
The elements or compounds produced by a chemical reaction.
The “cookies”

5. 2 Mg + O2 -----> 2 MgO + energy

6. Activation Energy The energy needed to start a reaction
The “spark” that starts a reaction

7. Reactants
Products

8. 2 H2 + O2 2 H2O Chemical Reaction Reactants Products
Hydrogen plus Oxygen
Products
2 H2O
Water
react to form

9. Energy in Chemical Bonds
Exergonic
Releases energy
Exothermic
Breaking bonds releases energy
Can occur spontaneously
Endergonic
Absorbs energy
Endothermic
Forming bonds absorbs energy

10. If a reaction in one direction releases energy, the reaction in the opposite direction absorbs energy.

11. Exergonic Chemical Reaction
Reactants
2 H2 + O2
Hydrogen plus Oxygen
Products
2 H2O
Water
react to
form

14. Endergonic Chemical Reaction
Reactants
2 H2O
Water
Products
2 H2 + O2
Hydrogen plus Oxygen
can be
separated
into its
components

17. IAN LHP
Compare and Contrast:
Endergonic vs
Exergonic

18. 9 October 2019 P. 36 Questions P. 51 #1-6 Questions P. 53 # 1-5
Analogy
P. 37
Enzymes
Read Text pp

19. Catalyst A substance that accelerates the rate of a chemical reaction
Lowers a reaction’s activation energy

20. Enzymes Proteins that act as biological catalysts
Reduces activation energy
Speed up reactions

22. Analogy
Explain how enzyme activity works like a lock and key.

23. Catalyzed Reaction
Reactants in enzyme catalyzed reaction are called substrates
Substrates bind to active site, precise fit
Form enzyme-substrate complex
Allows reaction to take place with less energy or at a lower temperature
Release and enzyme is free to start again

25. LHP 36 Read Text pp. 49-53 Questions P. 51 #1-6 Questions P. 53 # 1-5
Analogy
Explain how enzyme activity works like a lock and key.