Atoms and Molecules

Week 2

Lectures

1. Ionic and covalent bonding; properties of ionic and covalent compounds; molecules, molecular mass and the mole. (MC)
2. Molecular orbitals, shapes of molecules (AC)

Background reading
        General, Organic & Biological Chemistry Structures of Life
        Chapter 4
        Chemistry, Molecules, Matter, and Change:
        Chapters 7, 8 and 9

Study guide
        General, Organic & Biological Chemistry Structures of Life
        4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 4.10
        Chemistry, Molecules, Matter, and Change:
        pp 18 - 25 (substances), 68 - 71 (molar mass), 322 - 341 (ionic and covalent bonds), 363 - 372 (shapes of         molecules), 388 - 394 (molecular orbitals)

Problems

5.    How many molecules of water are there in a drop (= 50 ml; density = 1 g/ml)?
Answer

6.    How many non-bonding electron pairs do the following molecules have in their outer atomic shells? 

I₂, CO₂, HCl, NH₃, CH₄, H₂O, Ar

What are the shapes of the molecules?

What is the weight of one mole of each of these substances?
(Use the Periodic Table to obtain the relative atomic masses).
Answer

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This page was last updated by Martin Chaplin
on 21 July, 2005