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substance The physical matter, material
atom basic building block of matter, has a nucleus
nucleus center of atom
proton positive charged particles
neutron particles that have no charge
electrons negative charged particles
element pure substance that can not be broken down
isotope atoms of the same element that have different number of neutrons
compound substance formed when two or more different elements combine
covalent bond electrons are shared between atoms
molecule compound where atoms are held together by covalent bonds
ion atom that loses or gains 1 or more electrons, carries electrical charge.
ionic bond electrical attraction between 2 opposite charged atoms
van der walls force attraction between the molecules
chemical reaction atoms reorganize into different substances
reactant starting substance
product substance formed during the reaction
activation energy minimum amount of energy needed for reactants to form
catalyst lowers the activation energy
enzyme speeds up rate of chemical reaction
substrate reactant that binds to enzyme
active site where the substance binds with an enzyme
hydrogen bond a weak chemical bond between a negative electron and hydrogen atom
solution combo of solute and solvent
solute what dissolves in solvent
solvent does the dissolving
mixture combo of 2 or more substances that keep characteristics and properties
polar molecule equal distribution of charges
macro molecule large molecule
polymer large molecules composed of many similar smaller molecules linked together
lipid store energy, composed of fatty acids
protein transport things, made of amino acids
nucleic acid store, transmits, genetic info phospate , nitrogen base, ribose sugar
Created by: picklepie515