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Science pg55

Chemical Reaction a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.
Reactant a substance that takes part in and undergoes change during a reaction.
Product a substance that is formed when two or more chemicals react.
Activation Energy the minimum energy which must be available to a chemical system with potential reactants to result in a chemical reaction.
Catalyst a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
Enzyme biological molecules (proteins) that act as catalysts and help complex reactions occur everywhere in life.
Substrate a substance or layer that underlies something, or on which some process occurs, in particular.
Atom the basic unit of a chemical element
Nucleus the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
Electron a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
Element each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter.
Isotope each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.
Compound a thing that is composed of two or more separate elements; a mixture.
Ionic Bond the complete transfer of valence electron(s) between atoms
Ion an atom or a molecule in which the total number of electrons is not equal to the total number of protons.
Covalent Bond a chemical bond that involves the sharing of electron pairs between atoms
Molecule a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
Van Der Waals forces weak, short-range electrostatic attractive forces between uncharged molecules, arising from the interaction of permanent or transient electric dipole moments.
Created by: jmccarth