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Definitions - Ch. 2

Anatomy & Physiology Chapter 2 Definintions

matter anything that occupies space and has mass
states of matter solid, liquid, gas
solid has definite shape and volume
liquid has definite shape but no definite volume (has no definite shape and definite volume)
gas does not have definite shape or volume
energy the capacity to do work or put matter into motion
kinetic energy energy in action
potential energy stored energy; has the capability to do work but is not now doing so
forms of energy chemical, electrical, mechanical, radiant
chemical energy stored in the bonds of chemical substances (food molecules, ATP). biological usable form of energy
electrical energy movement of charged particles
mechanical energy directly involved in moving matter
radiant energy that travels in waves (electromagnetic spectrum)
enzyme biological catalyst (a substance that speeds up the rate of chemical reaction without undergoing any chemical change itself)
molecule combination of two or more atoms held together by chemical bonds
atom composted of protons neutrons and electrons
nucleus composed of protons and neutrons
element composed of atoms that display the characteristic properties of that element
compound when two or more different kinds of atoms bind to form molecules
mixtures substances composed of tow or more substances physically intermixed (can be separated)
solutions homogeneous mixtures of components that may be gases, liquids, or solids
solvent substances in a solution present in the greatest amount (dissolving medium)
solute substance in a solution present in smaller amounts (thing that is dissolved)
Created by: 1448082520