part 2: chemical reactions, acids and bases The Chemistry of Life part 2: chemical reactions, acids and bases

Chemical Reactions Occur when bonds are formed or broken Occur in the cells of living things – break down and build important molecules

Metabolism All of the chemical reactions that occur within an organism

Dehydration Synthesis Removing water to join two molecules together Adding water to split apart a large molecule into smaller molecules Hydrolysis

Chemical Equations Law of Conservation of Matter Must be balanced – same number of atoms of each element on both sides of the arrow.

reactants products 2 H2 + O2 2 H2O number of molecules number of atoms

Remember this equation! C6H12O6 + O2 CO2 + H2O +Energy 6 6 6 Remember this equation!

Acids and Bases pH is a measure of how acidic or basic a solution is. An acid is a substance that forms hydrogen ions (H+) in water. A base is a substance that forms hydroxide ions (OH-) in water.

pH of human blood is just over 7.5. Buffers help the human body maintain equilibrium of the blood’s pH level Example of homeostasis