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 of chemicals into another Reactant (+ Reactants)  Product or Products Reactants on the left  Products on the right CO 2 +H 2 O  H 2 CO 3 H 2 CO 3  CO 2 +H 2 O 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