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KEY CONCEPT Life depends on chemical reactions.

KEY CONCEPT Life depends on chemical reactions. Bonds break and form during chemical reactions. Chemical reactions change substances into different ones by breaking and forming chemical bonds . Reactants are changed during a chemical reaction.

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KEY CONCEPT Life depends on chemical reactions.

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  1. KEY CONCEPT Life depends on chemical reactions.

  2. Bonds break and form during chemical reactions. • Chemical reactions change substances into different ones by breaking and forming chemical bonds. • Reactantsare changed during a chemical reaction. • Productsare made by a chemical reaction. 6O2 + C6H12O 6CO2 + 6H2O Reactants (Yields) Products Water + Sugar Yields Carbon Dioxide and Water

  3. A reaction is at equilibriumwhen reactantsandproducts format the same rate. CO2 + H2O H2CO3

  4. Bond energy is the amount of energy that breaks a bond. Bond Energy • Energy is added to break bonds. • Energy is released when bonds form.

  5. Chemical reactions release or absorb energy. • Activation energy is the amount of energy that needs to be absorbed to start a chemical reaction. Not all chem. rxns can start on their own and need a little energy input.

  6. Exothermicreactions release more energy than they absorb. Heat produced. • Reactants have higher bond energies than products. • Excess energy is released by the reaction. Respiration

  7. Endothermic reactions absorb more energy than they release. Heat absorbed (gets cold) • Reactants have lower bond energies than products. • Energy is absorbed by the reaction to make up the difference. Photosynthesis

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