CHEM1002 Final: Chem Notes & Study Guide
Document Summary
Topic 1 classification of matter, kinetic theory, atomic structure and. Macroscopic properties of matter: classifying matter, elements: made of only one type of atom, all contain same number of protons, compounds: made of two or more types of atoms chemically bonded in fixed rations. Ionic compounds: made of metal or nh4 opposite but equal charges. If number of electrons is different, atom is called an ion: mass number (a): number of protons plus number of neutrons in the nucleus, number of neutrons for an element may vary, called isotopes. Isotopes: atoms with the same number of atoms (atomic number) but different number of neutrons (different mass number: have the same chemical properties, but different physical properties, e. g. carbon-14 is radioactive, but carbon-12 is not. Ion: when the number of protons does not equal the number of electrons in an atom or group of atoms: the atom now has a charge, polyatomic ion: ion that contains more than one atom, e. g.
