Chem 201: Outline for Exam Three on Monday
1. Review section 4.2 Concentration Units: ppb, ppm, Molarity.
2. Review section 4.3 Dilutions: M1V1=M2V2
3. Review section 4.4 Electrolytes vs. Non-electrolytes
4. Study Figure 10.2 regarding sizes of ions.
5. Be able to put compounds and molecules in order of increasing intermolecular interactions: ion-ion, ion-dipole, H-bonds, dipole-dipole, dipole-induced dipole, dispersion
6. Related intermolecular forces to physical properties such as mp and bp.
7. Identify all the regions of the phase diagram.
8. Know more ways of expressing solution concentration: molality, percent by mass.
9. Be able to interconvert concentration units.
10. Carry out calucations for all colligative properties: vapor pressure lowering, boiling point elevation, freezing point depression, and osmotic pressure.
11. Use the van’t hoff factor correctly.
Chem 201: Problem Solving Session
Solutions problems and collegative properties problems take lots of practice. I will be in my office tomorrow at 9:00 ready to solve problems for whomever arrives!
Chem 201: Lab Posted
Determination of Molar Mass by Freezing Point Depression is now available on my website.
Chem 201 Substitution: Answer Key
Students in Dr. El-Maazawi’s class, here is the answer key I promised to you.
Physical Science 107: Current Public Issues in Physical Science
This Spring I will be teaching a course for the first time – Physical Science 107. This course is IAI approved as a 3 credit hour General Education science course (no lab). I’ll be presenting the course in four units: Air, Water, Earth and Fire. The course will exam a variety of fascinating and very current issues: Climate Change, Sustainability, Energy, Environmental Concerns – whatever is in the news. The goal of the course will be to develop the scientific literacy of the non-scientist and to allow students to gain an in-depth understanding of complex problems that affect all of us from the perspective of the scientist. I’ll be developing the syllabus and course website over the next few months. Please let others know about this course and let students know that they can email me, jwalker@ccc.edu, with any questions. I’m looking forward to teaching this course and anticipate many interesting demonstrations, lively discussions and fun projects.
Chemistry 203: Quiz Tips and New Handouts!
I’ve posted some new handouts to help you with the transition metal/coordination compounds topic. I’ve posted a reference guide for Inorganic Nomenclature. Also I would like you to read this article: A millennial overview of transition metal chemistry and answer the questions of this worksheet (answers are given at the end of the worksheet but please try to answer the questions on your own first!)
To prepare for the quiz on Thursday please make sure you can do the following:
1. Write electronic configurations for the first row of the transition metals
2. Give the MOST COMMON oxidation states for the first row of the transition metals.
3. Determine the oxidation state of a metal in a coordination compound.
4. Identify if a ligand is monodentate, bidentate or polydentate.
5. Apply the rules for nomenclature of coordination compounds to convert from formulas to names and names to formulas. (Do all the homework problems available on this topic – practice!)
6. Answer questions about periodic trends for transition metals. (section 23.1)
7. Determine if a tranistion metal is paramagnetic or diamagnetic.
8. Visually identify inorganic compounds on this page by color.
9. Answer questions about metallic behavior and reducing strength.
10. Discuss the toxicity of mercury.
The quiz covers the material in Chapter 23 from the beginning until the end of sample problem 23.3. It does not cover section 23.2. There is a lot of information in these few pages – so read them carefully and take notes!!
Chem 201: Exam Two
Exam Two
Chapter Six
All types of problems with PV=nRT and P1V1/T1=P2V2/T2
Problems about gas density and the relationship to molar mass.
Graham’s Law of effusion (relationship with rate of effusion and molar mass)
The general conditions required for ideal gas behavior.
Description of common gases (as listed on worksheet)
Chapter Seven
Frequency/Wavelength conversions
Identification of areas of the Electromagnetic Spectrum
Relationship between energy and wavelength/frequency
Three main experiments: Photoelectric Effect, Blackbody Radiation and Emission/Absorption Spectra
Quantum numbers and relationship to properties of orbitals (size, shape, orientation in space)
Aufbau principle (1s22s2…)
Chapter Eight and Nine
Lewis dot structures
Periodic Properties: size and ionization energy
VSEPR Theory
Formal Charge
Shape and polarity of molecules
Chem 201: Students Enjoy New Conference Room
A special thanks to those students who stayed late yesterday to put in some extra time working on chemistry concepts. This opportunity will be repeated November 30th.
Chem 201: Class Cancelled
Due to a building evacuation (which was necessary according to protocol but which was precipitated by a hoax) we had to cancel our class. I will make the necessary adjustments to the syllabus and post the changes sometime this evening. In the meantime please enjoy your halloween holiday and study for the quiz – which will be given on Wednesday. The building is open now and all classes are proceeding as scheduled.
Gardening: Fall Color and Winter Grains
Fall is my favorite season. I love the colors that appear when plants no longer make chlorophyll. These yellows, oranges and reds are a class of chemicals called carotenoids, xanothophylls and anthrocyanins (reds and purples). Read more about the chemistry of Fall colors.
tarragon, roses, mums, and blueberry leaves
And just because the days are shorter and the air is growing colder doesn’t mean the planting has to end. I’m experimenting with winter wheat and barley, alternatives to grass.
This bright green color is an odd sight in the Fall.
And while I am thinking about all these ideas it is nice to have a place to sit and enjoy the lavendar, the thyme, and the fun painted design on this bench by my youngest son.
a place to rest and think
Chem 203: Electrochemistry Practice Quiz
I’ve posted a quiz. It covers the entire chapter so some questions would best be considered after the exam – ones related to Gibb’s Free Energy, Equilibrium, etc. Anyway, here is the link:
Electrochemistry Practice Quiz
I haven’t posted the answers yet. Email me if you have questions you are not sure how to answer.
Chem 201: Quiz on Wednesday
The quiz on Wednesday will conver periodic trends and Lewis Dot Structures. Know about atomic and ion size trends so that you can put atoms/ions in order by size. Know about ionization energy trends. Know how to write Lewis Dot Structures.
This homework sheet is very important! Be sure to go over it. http://justonly.com/chemistry/chem201/students/handouts/lewis_practice01.pdf
Chemistry: Assigning Oxidation Numbers
I’ve created a new handout summarizing the rules for assigning oxidation numbers to the atoms in chemical compounds. Chemistry 203 students should use this for review. It will be very important to have the rules memorized before beginning electrochemistry.
Chem 203: New Ksp video
I’ve created a new video from problem number nine on the last quiz. In this video I work out a problem involving Ksp. Here are the relevant links:
Chem 201: Monday
I am posting this message to let you know I will be in my office Monday morning – but there won’t be a scheduled study group. You are welcome to come on by if you have any questions – I’ll be working on grading and the usual organizing of paperwork. Lab notebooks are due on Monday so if you have any questions about your notebooks that would be another reason to drop by and see me. Enjoy your weekend and think about chemistry!
And please enjoy this phenomenal gallery: http://www.asylumresearch.com/Gallery/Gallery.shtml
Chem 203: Study Group Session – Thermodynamics
A problem solving session for thermodynamics problems will take place in my office from 9:00 a.m. to 11:00 a.m. on Wednesday, October 19th for Chem 203 students. All are invited.
If you are still trying to wrap your thoughts around the first and second laws of thermodynamics – try watching this puppet show.
Chemistry and Anatomy Puzzle
The latest issue of Journal of Chemical Education contains a fun puzzle that will help you learn the names of the chemical elements and the names of the bones.
This activity is from: http://pubs.acs.org/doi/abs/10.1021/ed200231g
Chem 201: Small Group Study Session Monday Morning
I will be holding a small group study session in my office on Monday morning from 9:30 until 11:30. The session will focus on the following topics:
1. solving problems related to any of the gas laws (bring the problem you wish to see solved to the study session)
2. practice using the equations λ=c/ν and E=hν
3. practice writing electronic configurations for ANY atom – not just the easy ones (1s22s2 etc.)
All are invited! Hope to see you there.