Chemical Reactions - Lemon Bay High School

Chemical Reactions and
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
CO2+H2O H2CO3
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 act as
• 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
• Their name is derived from the reaction it
• 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
Answer p. 53 1-5
Complete Analyzing Data p. 51 1-6