Module 2 Overview & Instructions
Foreword
The first part of this module, on the solubility of molecular substances and ionic compounds and solution concentrations, should be review from General Chemistry I. Past that, we finally get to new material: how solubility changes with temperature, factors affecting the solubility of gases, and colligative properties.
Notice a difference in due-dates for this week. Some assignments are due on Thursday, May 25, but Memorial Day weekend follows. Rather than having assignments due during a 3-day weekend, I made the second set due on Tuesday, May 30. The first round of assignments for next week, though, is still due on Thursday (June 1), so think about getting everything done before Memorial Day weekend so you don't have stuff hanging over your head and you won't have more to do next week.
Questions and Answers
Whatever you're struggling with this week, somebody else in our section probably is struggling with it, too. Post your question on the Module 2 Q&A Board.
If you know the answer to someone's question, post it. It's almost a certainty that more people in our section than just the person who posted the question want to know the answer.
Learning Outcomes/Objectives
By the conclusion of this learning module, you should be able to:
- understand the concepts of saturation and supersaturation.
- identify the different energy considerations of dissolving substances.
- understand and predict the impact of temperature on solubility.
- understand and apply Le Chatelier's Principle for situations involving solubility and temperature.
- interpret solubility curves.
- understand the exothermic nature of dissolving gases.
- define colligative properties.
- understand the molecular basis of vapor pressure lowering.
- use Raoult's Law to calculate the vapor pressure of a solution and the change in vapor pressure of a solvent.
- understand the additive nature of vapor pressure for ideal solutions of volatile components.
- understand the physical basis for positive and negative deviations from Raoult's Law.
- understand the physical basis for boiling-point elevation and freezing-point depression.
- know the definition of molality.
- use equations to calculate change in boiling point and change in freezing point.
- understand the physical basis for osmosis and osmotic pressure.
- use the equation for osmotic pressure.
- understand the concept of ion pairing and the van't Hoff factor, i, in colligative-property equations.
- use colligative properties to calculate the molecular weight of a solute.
Stuff to Read, Watch, Think About, and Study
Before you watch the videos below, download the Module 2 Slides Download Module 2 Slides, and use them to take notes as you follow along.
read: Solubility Links to an external site.
watch: Solubility and Temperature: due by May 25 at 23:59 MDT
watch: Solubility of Gases: due by May 25 at 23:59 MDT
do: WebAssign HW -- Solubility and Temperature; due by May 25 at 23:59 MDT
read: Colligative Properties Links to an external site.
watch: Vapor Pressure Lowering; due by May 25 at 23:59 MDT
watch: Boiling Point Elevation and Freezing Point Depression; due by May 25 at 23:59 MDT
watch: Osmosis and Osmotic Pressure; due by May 25 at 23:59 MDT
practice: zero-stakes practice problems: module 2a study problems Download module 2a study problems; module 2a study problems key Download module 2a study problems key
watch: Colligative Properties of Electrolytes; due by May 30 at 23:59 MDT
watch: Determining Molar Mass from Colligative Properties; due by May 30 at 23:59 MDT
practice: zero-stakes practice problems -- module 2b study problems Download module 2b study problems; module 2b study problems key Download module 2b study problems key
do: WebAssign HW -- Colligative Properties; due by May 30 at 23:59 MDT
do: WebAssign timed (60 min) quiz -- Physical Properties of Solutions; due by May 30 at 23:59 MDT