BCHEM 142A   General Chemistry I

Winter 2013                  General Assignment #8                February 22 , 2013

Reading Assignments and prep work for class in week 8 (Feb 24 – Mar 2):

• For Tuesday, Feb 26

• Read and thoroughly study the assigned sections of Chapters 4 -5 of Zumdahl for the exam. Note that we have skipped the half-reaction method in chapter 4 and have skipped several detailed sections of Chapter 5 dealing with the kinetic theory of gases. Study only the sections assigned in the General Assignments for those weeks.
• Complete all of the exercises and problems in the Hanson activities that we have done in this section: 5-2, 5-3, 4-2, 4-3, 4-4, 11-1, 11-3, and 11-2.
• Complete all of the OWL mastery problems by 11 AM on Feb 25.
• Complete as many as possible of the OWL extra-credit, End of Chapter Problems for chapters 4 and 5 by 11 AM on Feb 26.
• Prepare a 4 x 6 “ card including whatever you will need (student number, unit conversions, nomenclature of difficult-to-name compounds, important constants such as Avogadro’s number, Gas Constant, value of the amu in grams, and solubility rules.)
• Bring your calculator – no cell phones allowed – only ordinary calculators .
• Bring pencils or blue/black pens – no red pens on the exam.
• The second page of this GA8 lists topics to be covered on the exam that are very likely to be there.

• For Thursday, Feb 28
• Read and thoroughly study sections 6.4 – 6.8 of Zumdahl..
• Read Hanson Activity 15-2 and complete Key Questions 1-7 on page 274 before class.
• Read Hanson Activity 15-4 and complete Key Questions 1-5 on pages 282-83 before class.
• These Key Questions will be the subject of a clicker quizzes during class on Thursday

After Classes:  Always complete the exercises and problems for the active learning exercise(s) if you did not get them finished in class.  It is important to complete these as they may be checked during the term.

Homework : See OWL for details and due dates. The summary of assignments is:

· Required Assignments due Mar 11, 11:00 AM: sections of chapter 6

· Required Assignments due Mar 18, 11:00 AM: sections of chapters 7 and 8

· Extra Credit due March 19, 11 AM: 6-EOC

· Extra Credit due March 19, 11 AM: 7-EOC and 8-EOC

Topics to review for Exam 2

· Understand strong electrolytes, weak electrolytes, nonelectrolytes, and the definitions of solute and solvent.

· Understand how to calculate the concentration of a solute in terms of molarity.

· Be able to calculate the number of moles of solute from the volume and molarity of solution

· Be able to calculate the volume of solution from its molarity and the number of moles of solute.

· Understand dilution and how to calculate concentrations of solutions that result from dilution.

· What are precipitation reactions?

· Be able to apply the simple rules for solubility of salts in water

· Be able to write, balance, and work with: complete ionic equations, net ionic equations, and molecular equations for reactions of electrolytes.

· Be able to do stoichiometry calculations for precipitation reactions.

· Be able to recognize acid base reactions. Which is the acid? The base?

· Be able to recognize oxidation-reduction (redox) reactions.

· Know what species is oxidized and what one is reduced?

· Which is the oxidizing agent? The reducing agent?

· Be able to assign oxidation numbers to chemical species. You may need some guidelines on your 4x6 card for some cases.

· Be able to use the changes in oxidation numbers to assist in balancing reactions. (The oxidation state method)

· Be able to balance redox reactions in acid or base aqueous environments.

· Know the ideal gas law and how to apply it under various conditions.

· Given a final and initial state and a set of constant parameters, know how to determine those that change in going from one state to the other.

· Be able to do stoichiometry for reactions involving gas reactants or products.

· Be able to convert readily from moles to partial pressures for reactants and products.

· What is STP and what is the molar volume at STP – put these on your card.

· Understand how to calculate molar mass using the ideal gas equation.

· Understand the Law of Partial Pressures and how to apply it to gas mixtures.

· Understand how the vapor pressure of water enters the problem when a gas is collected over water – gas is one of the gases here. The partial pressure of water is its vapor pressure; you will be given this number if needed.

· Be familiar with the van der Waals equation of state – do not memorize it, as it will be provided. Understand what nonideal aspects of a gas are accounted for by it, and which parameters (a or b) correspond to them.

· Know what conditions of pressure and temperature favor ideal behavior of real gases.

· Be familiar with the general assumptions and conclusions of the kinetic theory of gases at the level of Hanson 11-2; do not worry about the more detailed derivations and computations presented in some sections of Zumdahl. Use Hanson and our class notes to guide you here.