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Biology Chapter 2 Vocabulary Test

Across
An attraction between 2 atoms as a result of sharing or transferring valence electrons.
A substance that binds to an enzyme and reduces its activity, thus slowing a chemical reaction that the enzyme catalyzes.
The ability to do work. The driver of the physical and chemical processes necessary for life.
The building block of matter; the smallest particle of an element.
A change in a substance that results in one or more new substances being formed that have different physical and chemical properties than those of the original substance.
A substance that can produce hydrogen ions (H+) in solution.
A covalently bonded compound containing the element carbon.
A class of organic compounds that serve as the building blocks for the information storage molecules DNA and RNA.
A measurement of the average speed of the the particles within a substance.
The smallest particle of a covalently bonded compound.
A class of simple organic compounds important in living things as a source of both energy and structure.
The tendency of energy to disperse and become less available to do work.
The attraction of particles in one substance for particles in a different substance.
The physical stuff that makes up the universe. Anything that occupies space and has mass.
Down
The process by which particles in solution are evenly distributed throughout the solvent by Brownian motion.
A substance that can produce hydroxide ions (OH-) or accept hydrogen ions (H+) in solution.
The process by which one substance, the solute, is broken up into smaller pieces by and distributed within a second substance, the solvent.
A change in a substance that does not change the identity of the substance.
A class of organic compounds that serve as the building blocks of proteins.
A naturally occurring catalyst, usually a protein.
A substance that is present before a chemical reaction and takes part in it, usually shown on the left-hand side of a chemical equation.
An organic compound comprised of the elements carbon, hydrogen, and oxygen; includes sugars, starch and cellulose.
The substances formed during a chemical reaction, usually indicated on the right-hand side of a chemical equation.
A class of nonpolar organic compounds that are insoluble in water and are used for energy storage and cell membranes in living things.
The attraction between like particles within polar substances.
Quality of molecules having an uneven distribution of electrical charge, resulting in some regions of a molecule having negative charge while others are positive.
A pure substance made from 2 or more elements that are chemically combined.
A substance that changes the rate of a chemical reaction but is not itself used up or affected by the reaction.
A pure substance made of only one kind of atom.