Chemical Reactions and Enzymes Chemical Reactions A process that - - PowerPoint PPT Presentation

Chemical Reactions and Enzymes

Chemical Reactions

• A process that changes, or transforms one set
• f chemicals into another

Reactant (+ Reactants)  Product or Products Reactants on the left Products on the right CO2+H2O H2CO3 H2CO3CO2+H2O Chemical reactions always involve changes in chemical bonds.

Energy in Reactions

• Chemical reactions that release

energy often occur spontaneously.

• Chemical reactions that absorb

energy will not occur without a source of energy.

• The energy release is usually in the

form of heat, light, or sound.

Activation Energy

Enzymes

• Enzymes act as

catalysts

• A catalyst is a

substance that speeds up the rate of a chemical reaction.

• Enzymes speed up

chemical reactions that take place in cells.

Enzyme Action

• Enzymes are very specific, catalyzing only one

reaction.

• Their name is derived from the reaction it

catalyzes.

• Enzymes provide a site where reactants can be

brought together to react.

• This reduces energy needed for reaction
• The reactants of enzyme-catalyzed reactions are

known as substrates

• enzymes in action

Assignment

Answer p. 53 1-5 Complete Analyzing Data p. 51 1-6