CORRECTION!!! on the latest practice sheet I just posted, for #3, the calculation for percent H in H2O should have used 2.02/18.02. this propagates through the whole problem. When you get to the empirical formula calculation you should be using 13.4g of H and the empirical formula should be:  C1H4N

Any others let me know. (a note on #2, I used the R value from the lab. Old habits die hard, I will try to use the IB R value from now on. you should get the same answer either way. A constant is a constant no mater what the units.)

Here are a few more Topic 1 practice problems if you would like. Remember, Topic 1 Test next class (W/Th).

And here is the key, I just worked them out, please let me know if you think there is an error.

link to a quiz /flash card site for polyatomic ion memorization. Remember after this test you need to have these memorized. I think these 22 on this site are enough. I'll double check to be sure but get started now.

polyatomic ion quiz site

Here is the corrected full key for topic 1 questions. we will be having our test next week. Be sure to read up on the gas laws, and ideal gas calculations.

Here is the pre-lab for lab 2. Also see the IB Chem home page for the individual enrichment guidelines.

You should be working through the Topic 1 practice problems. Here is a key showing only the answers, I will post one with the work in a couple days. These are not easy problems, you need to work at them. 

Now that our first lab is finished here is what you need to do with your data/results. Below is a repost of the lab including a second page with your assignment outlined. there is a list of questions (addressing those learning targets that this lab is hitting) and lab report assignment. You should have this done by next class. The lab report does not need to be turned in to turnitin.com we will be going over this one in class.

Hi all, after thinking a bit more about it I think that those of you that need to redo step one of the lab can just do it in class next week. It didn't take that long and you should have plenty of time during next class. See you soon.

Here are the problems we started looking at in class. Remember we will be working through topic 1 for the next week and a half. We have two more labs after this one and we will continue looking at these problems and addressing any questions you have from them or the book questions. Make sure you are finding any gaps in your content knowledge so we can fill them.

Sorry for the late post. here is the key for the Topic 11 practice. Be sure to be ready for the quiz next class. Also the outline for the lab is below, get ready for the lab by reviewing the learning targets listed and writing a brief background on determining formulas. 

Finish with the topic 11 text. I have posted the Answer key for the text book on the text tab. Below is a practice worksheet for Topic 11. We will be having a quiz next week (Thursday/Friday, but will probably be moving on by Tuesday/Wednesday) I will post the key next week.