Molecules
Molecules: what are they? We talk about molecules a lot on
chemistry, but what are they. Well, we talk a little about them in Bonding, but let's talk about what a molecule is.
A molecule is a combination on atoms. For example, a water molecule is
comprised of two hydrogen atoms and one oxygen atoms. Its formula is
H2O. This is not the only way that oxygen and hydrogen can
combine. Hydrogen peroxide, what many people use to bleach hair or
disinfect wounds, contains two hydrogen atoms and TWO oxygen atoms. Its
formula is H2O2. Similarly, taking away one
hydrogen from water gives a hydroxide ion, OH-. All three of
these combinations of oxygen and hydrogen are molecules. We consider any
combination of different elements molecules.
