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unit 3


Atom A single particle of and element; the building blocks of matter
Molecule A compound in which atoms are held together by covalent bonds
Covalent Bond Chemical bond formed by two atoms sharing electrons.
Ionic Bond Electrical attraction between oppositely charged atoms
Reactant The starting substances that goes into a reaction
Product The substances formed during a chemical reaction
Activation Energy The energy required to start a chemical reaction
Catalyst any substance that lowers the activation energy of a reaction
Enzyme proteins that act as biological catalysts to speed up reactions.
Polar Molecule with + and - ends due to uneven electron sharing
Hydrogen bond an electrical attraction between two oppositely charged atoms.
Cohesion water molecules attracted to each other due to hydrogen bonds
Adhesion water molecules form hydrogen bonds with different molecules
Surface Tension 'film' due to the cohesion between surface water molecules
Acid a liquid with pH less than 7
Base a liquid with pH greater than 7
Carbohydrate Macro-molecule that provides energy; sugars and starches
Monosaccharide The monomer of carbohydrate molecules
Lipid macro-molecule that insulates and stores long term; fats
Fatty Acid The monomer of lipid molecules
Protein macro-molecule that provides structure, and regulates cell functions.
Amino Acids The monomer of protein molecules
Nucleic Acid macro-molecule that carries genetic information
Nucleotide the monomer of nucleic acid molecules
Created by: chrisw45