Chapters 17 and 18

1
Chapters 17 and 18

• An overview of the next unit

2
17.1 and 17.2

• The water molecule
• Surface properties
• Tension
• Capacity

• Evaporation and condensation
• Properties of ice
• Lab Solvent properties and a Taste of Molarity.
  You will like this!

3
Global Climate Change

• Waters unique characteristics contribute to
  global climate change Global Warming/ Climate
  change Unnatural amounts of carbon in the
  atmosphere will trap in heat
• Water heating up in the oceans
• Glaciers melting

4
17.3 and 17.4

• Solvent/solute/solution
• Electrolyte
• Hydration

5
18.1 and 18.2

• Properties of solutions
• Concentrations

6
18.3 and 18.4

• Freezing point depression
• Boiling point elevation

7
16.3 Polar Bonds and Molecules

• Polar moleculesalthough bonds may be polar the
  overall molecule is NOT
• CCl4
• Van der Waals forces weakest intramolecular
  force
• Dispersion forces weakest of both caused by the
  motion of electrons
• Dipole interactions polar molecules
• Hydrogen bonds the most interesting molecular
  bonds.this type of bonding gives water its
  unique properties

8
Lab this week

• You will need to understand the concept of
  Molarity or Concentration
• The unit for (M) molarity is usually mol /L
• Therefore, you may need to do some conversions
• For example How many grams of sodium hydroxide
  need to be added to 25 ml of water to make a 0.5
  M solution?
• How many grams of sucrose (C6H12O6) need to be
  added to 50ml of water to make a 2.5 M soln?

9
Homework

• Problems p. 466 22 p.471 55-58 p.478 1-4
  p.481 6 p.496 19,27,31,48