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Biology Chapter 2

9th grade BJU Biology Chapter 2

TermDefinition
matter the physical stuff that makes up the universe
atom the basic building blocks of matter
element pure substances made of only one kind of atom
energy the immaterial stuff that gets things done - the ability to work
temperature relative hotness or coldness
enthropy the tendency of energy to disperse and become less available to do work
physical change changes that don't change a matter's identity
chemical change matter changing in a way that completely changes its identity
bond stored chemical energy that holds two atoms together
compound a pure substance made of two or more element chemically combined
molecule the smallest part of a covalent compound
dissolving the process by which one substance is broken up into smaller pieces by another substance
acid a substance that dissolves in water to form hydrogen ions
base a substance that dissolves in water to form hydroxide ions
diffusion the process by which particles in a solution are evenly distributed throughout the solvent by Brownian motion
reactant a substance that is present before a chemical reaction and takes part in it
product the substances formed during a chemical reaction
catalyst a substance that changes the rate of a chemical reaction, not affected by the reaction
enzyme a naturally occurring catalyst, usually a protein
inhibitor a substance that bins an enzyme and reduces its activity
polar quality of molecules having an uneven distribution of electrical charge
cohesion the attraction between like particles within polar substances
adhesion the attraction of particles in one substance for particles in a different substance
organic compound a covalently bonded compound containing the element carbon
carbohydrate an organic compound comprised of the elements carbon, hydrogen, and oxygen; includes sugars, starch, and cellulose
sugar a class of simple organic compounds important in living things as a source of both energy and structure
lipid a class of non-polar organic compounds that are insoluble in water
amino acids a class of organic compounds that serve as the building blocks of proteins
nucleotide a class of organic compounds that serve as the basic building blocks for the information storage molecules DNA and RNA
Created by: krisztamod