1. (8th) Chapter 6-3 Cornell Notes
“Observing Chemical Change”

2. (8th) Chapter 6-3 Cornell Notes
Key Questions
(8th) Chapter Cornell Notes
What factors affect the rate of a chemical reaction?
How is activation energy related to chemical reactions?

3. (8th) Chapter 6-3 Cornell Notes
Key Terms
activation energy-
concentration-
catalyst-
enzyme-
inhibitor-

4. (8th) Chapter 6-3 Cornell Notes
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activation energy:
minimal E needed to start reaction;
all chemical reactions need it;
exothermic products less E than reactants, heat released & E no longer needed;
endothermic products more E than reactants so need more E to keep going.

5. (8th) Chapter 6-3 Cornell Notes
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(8th) Chapter 6-3 Cornell Notes
Paragraph 2
chemical reactions have different rates;
Factors affecting reaction rates:
surface area;
temperature;
concentration;
presence of catalysts;
presence of inhibitors.

6. (8th) Chapter 6-3 Cornell Notes
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Paragraph 3
in solids: only particles on surface area react with reactants;
increase rate of reaction by breaking up solid (more material exposed).

7. (8th) Chapter 6-3 Cornell Notes
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(8th) Chapter 6-3 Cornell Notes
fast moving particles more E, more E gets over “activation hump”.
increase temperature increases rate of reaction:
particles move faster, more chance of colliding/reacting;

8. (8th) Chapter 6-3 Cornell Notes
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Paragraph 5
increase concentration increases rate of reaction:
concentration: amount of substance in a given volume;
higher concentration more particles to react.

9. (8th) Chapter 6-3 Cornell Notes
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(8th) Chapter 6-3 Cornell Notes
Paragraph 6
change/lower amount of activation energy needed increases rate of reaction:
catalyst: affect reaction rate but not a reactant;
enzymes: biological catalysts like saliva.

10. (8th) Chapter 6-3 Cornell Notes
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Paragraph 7
inhibitor: material used to decrease rate of reaction:
most inhibitors prevent reactants coming together.