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Section 2.4 Chemical Reactions.

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Presentation on theme: "Section 2.4 Chemical Reactions."— Presentation transcript:

1 Section 2.4 Chemical Reactions

2 Chemical reactions change substances into different substances by breaking and forming bonds.

3 Chemical reactions are responsible for all the actions of organisms.
Examples Photosynthesis Respiration (breathing) Digestion

4 Metabolism is all the chemical reactions in an organism

5 Oxygen+Sugars CO2 + Water (Reactants) (Products)
Reactants are changed in a reaction EXAMPLE: Products are formed in a reaction Oxygen+Sugars CO2 + Water (Reactants) (Products)

6 Activation Energy: energy required to start a reaction.

7 Exothermic Endothermic Two Types of Reactions Energy EXITS!
The prefix “exo-” means “out” Example: respiration Energy goes IN! The prefix “Endo” means “into” Example: - photosynthesis

8 Vocabulary Check Making and breaking chemical bonds are examples of ____________. Bonds are broken in the ______, which are the chemicals that are changed during the process. Bonds are made in the ________, which are the chemicals that result from the process.

9 Vocabulary Check cont…
The ________ is the amount of energy needed to start a reaction. If a reaction absorbs more energy than it releases, it is called an __________ reaction. If a reaction releases more energy than it absorbs, it is called an __________ reaction.

10 Endo or Exo? 1.

11 Which is the solute, which is the solvent?
2.

12 Reactants and Products?
3. 2H2O H2O + O2

13 4. How are exothermic and endothermic reactions different?

14 Exothermic or endothermic?

15 Exothermic or endothermic?

16 Exothermic or Endothermic?


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