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Wednesday, 30 May 2012

Welcome to REDOX

I must apologize for not posting on the blog lately - life has been hectic!
On Tuesday, May29th we started our last unit - Electrochemisrty or REDOX for short. The photos below are of the notes, examples and homework we have covered in the past 2 classes.
For Friday work on the problems that were on the board - the answer key is there for you to make sure you are on the right track.








Tuesday, 8 May 2012

Titrations

On Monday we started Titrations -- most of this is a review as we have already covered titrations in Chem 11 and in Chem 12 solubility unit.  Read through the notes below for review.  There are several examples of titration problems.  They can be used to determine purity or molar mass of samples.  





The "Titration Analysis worksheet that will be due on Wednesday is below.  Watch for the diprotic acids and only taking the titration trials within 0.1 ml of each other!  The answers to these problems are in the photo of the board so you can see if you are on the right track.



Monday, 7 May 2012

In need of a Tutor?

If you are struggling with Chemistry, now is the time to get some extra help.  This information was passed on to me by Mr. Emerson.  Read below for Tutoring information:

My name is Darrol Colgur. I taught Chemistry 11 and 12 in BC for 35 years and have recently retired (2008). Since then I have helped many students with chemistry, both person-to-person and online—using email and live online sessions. The system I have developed and used for live online help works very well. I have a tablet PC and I use a screen-sharing application along with Skype. My extensive experience teaching chemistry and the way I relate to students, as well as my very reasonable rate ($20/h), I believe makes my service an excellent option for students seeking private help. My first hour session is a free trial with no obligations!
If you have a student that asks about getting help with Chemistry, I would sincerely appreciate you sending them my way. My e-mail address is the one I used for this email, my home phone is 250-494-9065, and my cell phone is 250-488-0949. Of course, because I’m online, I can help students anywhere. My times are also very flexible. My websites are the first ones that come up when “Googling” Chem 12 or Chem 11. There is more information on those.
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Wednesday, 2 May 2012

Kb calculations



Today there were many students away because of the playland field trip for Earth Science and Physics so we did not move too far ahead.  We did calculations involving kb -- see the board notes and example below.  Essentially, these calculations are the same as what we did on Monday with the ICE charts but because the predominant hydrolysis reaction is basic -- all the calculations must be about a base.  Instead of Ka - we use Kb (remember this must be caluclated), instead of pH we use pOH, instead of [H30+] we use [OH-].

Students were given class time to complete the following worksheet:

The answers to the questions that were assigned are in the photo below.  Watch out for g, h and K -- these ones have amphiprotic species -- so before you can do an ice chart you must compare the ka and kb of both reactions and decide which reaction is the dominant one -- if it is ka that is greater -- then the ice chart and the calculations will all be for an acid.  If the kb is greater -- then everything will be calculated for a base!! 
 There will be a 4 question quiz on ka and kb on Monday!!!  


Tuesday, 1 May 2012

Monday's forgotten post

Sorry - I forgot to update yesterday.  Here is what we did monday -
we marked the hydrolysis worksheet that was assigned on Friday

Then we started notes on "calculations that involve Ka"

see pics below for the notes

Homework for wednesday is pg 151 #74-83

Today (Tuesday - -we will be doing the hydrolysis lab -- no write-up for this one -- but after you collect all your data there will be a quiz (counts as a lab mark not a quiz mark though)