AP Chemistry unit 1 atomic structure and properties

  1. calculate the molar mass of substances and # particles using NA or also called avagadres number,

        A. Reprensative particles

        1. element: atoms

        2. Diatomic elements: molecules HONClBIF

        3. Ionic compounds: formulated units. Metal + Non metal. Polyatmoic ions exchange electrons to complete octets. Resulting charges result in electrostatic attraction is a ion bond.

        4. Covalent compounds by molecule. Non metals bonded together sharing of electrons form covalent bonds.

               Single bond is sharing 2 electrons

               Double bond is sharing 4 electrons

               Triple bonds is sharing 6 electrons.

HYDROGEN IS NEVER CENTRAL IN LEWIS DIAGRAMS.

                

TEST EXAMPLE QUESTION

WHICH OF THE FOLLOWING WOULD HAVE THE LONGEST C-C BOND.

    A. C2H6

    B. C3H4

    C. C2H2

    D. C3H8

(correct is a and d)

        5. Grams to representative partciles given ( (mass X 6.022 X 10^23)/molar mass )