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a substance that is made of more than one kind of element, combimed in sepcific proportions
two atoms of the same element with different mass numbers (same number of protons, different number of neutrons)
an electron in an atom's outer energy level, where it can take part in a reaction with other atoms
a weak attraction between a hydrogen atom and another atom; the way water molecules bond
the particle created when atoms bond together, with either similar or different kinds of atoms
an arrangement of a molecule where one side has a positive charge and the other has a negative charge
a material made of at least one substance that has dissolved another, so that all the components are equally distributed
a macromolecule that stores sugars in the body; formed by joining many monosaccharides
an energy-storing family of molecules made mostly of carbon and hydrogen, and which are not soluble in water; "fats"
a substance that speeds up the rate of a chemical reaction by lowering the activation energy
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