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10th Biology Chapter 2

Horizontales
Anything that occupies space and has mass.
The smallest particle of a covalently bonded compound.
A measurement of the average speed of the particles within a substance.
Usually a protein that serves as a natural catalyst.
Verticales
A substance that changes the rate of a chemical reaction.
A pure substance made of two or more elements.
The tendency of energy to disperse.
The ability to do work.
The building block of matter.
The attraction between two atoms.