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the use of a catalyst to bring about the cracking of mineral oils that boil at high temperatures.
the phase in matter in which the particles are far apart and can move freely.
a group of organic compounds in which a halogen has replaced a hydrogen atom.
an electron pair in which each atom provides one electron for the bonding pair.
a molecule that is so big that we can see it, e.g. a diamond, a salt crystal and a piece of...