Biochemistry

Biochemistry exams questions and
answers

Matter - -Anything that has mass and/or takes up space (volume)

-Element - -A substance that cannot be broken down into other substances
by chemical reactions

-Molecule - -Any combination of atoms

-Compound - -Two or more different elements combined in a fixed ratio

-Atom - -Smallest unit of matter that retains the properties of an element

-Atomic Number - -Number of protons

-Mass Number - -Number of protons plus neutrons

-Atomic Weight - -1 mole of a sustance = atomic weight in grams

-Isotope - -Atom with an abnormal number of neutrons

-Proton - -Positively charged subatomic particle

-Neutron - -Subatomic particle with no charge

-Electron - -Negatively charged subatomic particle

-Valence Electron - -Outermost electrons in an atom

-Covalent Bond - -Sharing of electrons (Two non-metals)

-Ionic Bond - -Electrostatic attraction of positive and negative ions (Metal and
Non-metal)

-Valence shell - -An atom's outermost electron shell

-Polar Covalent Bond - -Unequal sharing of electrons due to difference in
electronegativity

-Cation - -Positively charged ion

-Anion - -Negatively charged ion