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BIO Chemistry Vocab

AB
matterAnything that occupies space and has mass
massAmount of matter in an object
elementsSubstance that ordinarily cannot be broken down chemically to form simpler kinds of matter
atomSimplest particle of an element that retains all of the properties of that element
atomic numberThe number of protons in an atom
energy levelsAn imaginary place where electrons will most likely be located based upon the number of electrons and the amount of energy
compoundA pure substance which is made up of atoms of two or more elements
chemical reactionsThe process of breaking chemical bonds forming new bonds
bondAn attraction between two or more atoms where electrons are either shared or stolen – energy is stored in a chemical bond
covalent bondForms when two atoms share one or more pairs of electrons
moleculeA chemical structure composed of one or more atoms
ionsAn atom or compound with a net charge
ionic bondBond formed by electrical attraction between two oppositely charged ions
state of matterThe condition of molecules that is determined by the amount of energy involved – solid, liquid, or gas
exergonic reactionChemical reaction that involves a release of energy
endergonic reactionChemical reaction that involves a storage of energy
activation energyAmount of energy required for a chemical reaction to start and to continue on its own
catalystsChemical that reduces the amount of activation energy needed for a reaction but is not a reactant
enzymesA catalyst, usually a protein, in living systems
concentration gradientthe difference in concentration of a substance across space
adhesionthe property of water that makes it stick to materials
cohesionthe property of water that makes the water molecules stick to each other
solventin a solution, the substance in which a solute is dissolved
solutionmixture in which one or more substances are uniformly dissolved in another substance
solutesubstance dissolved in a solution
concentrationmeasurement of the amount of solute dissolved in a fixed amount of solvent
saturated solutiona solution in which no more solute can dissolve
aqueous solutiona solution in which water is the solvent
dissociationthe separating of a molecule into simpler molecules, atoms, radicals, or ions
hydroxide ionthe (OH-) formed when water breaks apart (dissociation)
hydronium ion(H3O+) that is formed when water breaks apart (dissociation)
acidany substance that increases the concentration of hydrogen (H+) ions when added to a water solution
baseany substance that increases the concentration of hydroxide (OH-) ions when added to a water solution
law of conservation of mattermatter can neither be destroyed or created
polaritythe unequal sharing of electrons in a molecule


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