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Chemical Reactions and Enzymes
What is a Chemical Reaction?
• A process occurs when molecules interact to produce new chemical compounds
• Examples:CH4 + 2O2 CO2 + 2H2O
2HCl + CaCO3 CaCl2 + CO2 + H2O
Sign of Chemical Reactions
• Gas formed• Precipitate (solid from solutions) formed• Color change• Temperature change• Odor produced
Chemical Reactions and Energy
• Energy is required to break chemical bonds• Energy is released when new bonds form• Some reactions are spontaneous• Many reactions require some energy input to
get started
Catalysts
• Catalysts are substances that speed up a reaction without being used up in the reaction
• They act by reducing the energy needed to start the reaction
Factors Affecting Chemical Reactions
• Temperature• Concentration of reactants• Presence of catalyst• Surface area exposed on solid reactants
Enzymes
• Enzymes are proteins that act as catalysts• Many enzymes are involved the processes of
photosynthesis, cellular respiration, and fermentation
http://www.chem4kids.com/files/bio_enzymes.html
http://www.chem4kids.com/files/bio_enzymes.html
Factors Affecting Enzymes
• pH• Temperature• Concentration of substrate• Inhibitory molecules• Activator molecules• pH or temperature can denature or change
the shape of the enzyme so it no longer fits the substrate