Search This Blog

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.
Following are a few testimonials from students I have worked with or their parents:

" Working with Mr. Colgur has helped me grasp chemistry in a way i never thought i could!
He's a great teacher that is beyond helpful and he made it easy for me to learn chemistry!
If you're struggling with chemistry, asking Mr. Colgur is the best thing you could do for yourself.
Chemistry 12 was my worst subject, and with Mr. Colgur's help i completed the subject with a mark i never thought i could achieve!
I don't think i could ever thank him enough for all of his help, Mr. Colgur is the most patient, understanding and helpful teacher i have ever worked with
Guaranteed, you'll feel more comfortable with your material after your first session of working with him! "                                                                                               
                                                                                                                                
A student from Surrey, BC

"I owe my A in chemistry to Mr. C. Ever since he started tutoring me, not only did the concepts become very easy to understand, I noticed that chemistry sucked a lot less. I was struggling in the subject, and was frustrated with the HW assignments and classwork since our teacher was not explaining things in class. I was also not doing well on my tests. With every tutoring session, with Mr. C, I mastered the skills of problem-solving, and eventually got an A in Honors Chemistry. If you are stuck and ask him any question a zillion times, he will find unique ways to explain the concept till he is sure that you understood it properly. I am so glad he was my tutor. He is unique in so many different ways- he loves to teach, and you will see a difference from the very first session with him. Call me if you need to hear more about my experiences as a student of Mr. C."                                                                                                  
                                                                                                               A student from California
I also want to personally thank you for all your help. It truly did make chemistry 12 a lot more fun and easy. The one to one tutoring gave me experiences that really helped me on the tests and provincial, and chemistry in general.
I wish I'd had a chance to say a proper thank you in person to you for being such a fantastic teacher.  D…  had a terrific experience in your sessions and from what I could observe, I can see why. You have such enthusiasm and patience. With your help D…  actually enjoys learning Chemistry 12. Something he initially thought difficult if not impossible to learn. The tutoring was amazing.  I have to convince my son to try this method of tutoring as he was reluctant initially but with your help he actually likes it. 

Thanks so much for reading this email. I truly appreciate it. As a former teacher I know how busy you are and how little time you have to read this kind of mail.
Darrol Colgur

his email is Darrol Colgur [dcolgur@gmail.com]

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)