Thank you for attending the Chem 201 Term Test 2 Prep Course hosted by Prep101. Solutions to the material provided in lecture are below:
Solutions to exam packages are in the tables below
Simplified guide to naming <– this gives an overview and is likely all you need to know!
Practice exams available: Winter 2017, Fall 2016, Winter 2016, Winter 2015, Fall 2014
|Winter 2017 (click for full solutions)||Fall 2016 (click for full solutions)||Winter 2016 (click for full solutions)|
|Verdict*: Excellent||Verdict*: Excellent||Verdict*: Excellent|
*Note: The Advice column gives recommendation for this year’s test. X means Exclude, Y means Do This as it’s highly likely to show up.
*Note: Verdict gives an overall appraisal of the exam’s expected likeness to this year’s test (either Excellent or Good). Definitely, attempt any Excellent exams under closed book conditions and grade yourself.
|Fall 2015 (click for full solutions)||Winter 2015 (click for full solutions)||Fall 2014 (click for full solutions)|
|Winter 2014 (click for full solutions)||Fall – (click for full solutions)||Winter – (click for full solutions)|
In older exams, examiners rarely stick to one name for molecular or electronic shape:
If you see:
Electron pair Geometry
VSEPR Electronic Geometry
It just means “Electronic Shape”
If you see:
VSEPR Molecular Shape
“Shape around X atom”
It just means “Molecular Shape”
If you are ever in doubt, ask one of the invigilators/staff whether the questions meant molecular or electronic shape. In more recent (2016-2014) exams, the examiners are more direct on electronic vs. molecular shape.
Naming organic compounds:
An amide was first tested on the November 2016 exam so any of these is fair game.
The website above is interactive, meaning, click on the functional group and at the bottom of each section you can click ‘Practice Questions’ and it takes you to an interactive tool to practice.
Here’s a direct link to the interactive practice tool http://www.chem.ucalgary.ca/courses/351/WebContent/ion/orgnom/structureToName.html
Notes on material that will be on the course
Resonance, Resonance Hybrids and Bond Order are all on the test.
Because you had up to Trigonal Bipyramidal examples in your tutorials, you WILL be tested on VSEPR up to AX6. The AX naming convention is a more useful way of knowing VSEPR shapes. Let’s say we have an AX4 structure – this just means 4 bonding domains so tetrahedral. AX3E means 3 bonding domains and 1 non-bonding or electron pair – giving us a tetrahedral electronic shape and a trigonal pyramidal molecular shape.
It’s up to you if you use AX notation, however, it makes things easier to understand and is used in nearly every major university textbook.
You need to know what a constitutional isomer is and you should realize that
- you can rotate around single bonds (this is why we can draw more than one wedge/hash diagram for the same exact structure)
- you CANNOT freely rotate around double bonds. This means you can have so called cis and trans versions that are totally different compounds.
- If a molecule has different bonding, it can have a different functional group – it therefore has different reactivity.
If you feel there are any errors or corrections feel free to email me. Most of this work has been checked multiple times but I still like feedback/questions. Thank you!
Things to Ignore
Ignore any questions that ask for sp1/sp2/sp3 hybridization or questions that ask you to give the number of pi (π) or sigma (σ) bonds. These are fair game for the final but not on this year’s test.
Note that any questions to ignore are in the excluded lists above.
None so far.
Feel free to email anything you have trouble with.
2016 Fall/Winter, 2014 Fall/Winter have all been checked against instructor solutions so there shouldn’t be a single issue.
If you wanted to learn more about nodes, here’s a written explanation.