factors affecting reactions

1. Energy and Rates of
Chemical Reactions

2. Energy and Rates of Chemical
Reactions
Endothermic reaction - a chemical reaction
that absorbs energy
Exothermic reaction - a chemical reaction
that releases energy

3. Rates of Reaction
Activation energy - the minimum amount of
energy needed to start a chemical
reaction.

4. Energy and Rates of Chemical
Reactions
The Law of Conservation of Energy
-states that energy cannot be created nor
destroyed, but it can change forms.

5. Factors affecting Rates of
Reaction
1. Temperature
-Higher temperatures causes faster
reactions. The particles move quicker.

6. Factors affecting Rates of
Reaction
2. Concentration
-the measure of an amount of substance
dissolved in a certain quantity of another
substance.

7. • The greater the concentration the
faster the reaction
• More molecules are able to react

8. Factors affecting Rates of
Reaction
3. Surface Area
-the amount of exposed surface to a
substance.

9. - increasing the surface area will increase
the rate of reaction
- greater surface area exposes more
particles to react

10. Factors affecting Rates of
Reaction
Catalysts
-a substance that speeds up the rate of a
reaction.
-it lowers the activation energy.

11. • Catalyst example:
–Enzyme – provides a surface for a
reaction to take place, found in cells.

12. Controlling Rates of Reaction
Inhibitors
-Substance that slows down or stops a
chemical reaction.
-it increases the activation energy