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Chemistry 2223B- Midterm Exam Guide - Comprehensive Notes for the exam ( 117 pages long!)


Department
Chemistry
Course Code
CHEM 2223B
Professor
Len Luyt
Study Guide
Midterm

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Western
Chemistry 2223B
MIDTERM EXAM
STUDY GUIDE

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Chemistry 2223B Winter 2015−16
Topic 1. Colours and Chromophores
This section discusses the absorption of light by organic compounds, the related
photophysical processes, and the spectroscopic methods used to measure light
absorption and emission. Examples of important chromophores will be introduced.
Background material, from prior chem courses, that is important is listed below.
Because Chem 2223B primarily focusses on the applications of concepts that you
have already seen, it is crucial that you understand this background material.
o Light: wavelength, energy, and amplitude
o Bonding and hybridization, conjugation, and resonance structures
o Fundamentals of molecular orbital theory
After completing this section and Experiment 1, attempt:
o Practice problems in the lab manual
o Midterm 1 and 2: 16 Midterm 3: 18 Midterm 4: 17, 9
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Colours and Chromophores 2
A. Perception of Colour
White light is comprised of a continuum of different colours. If white
light, such as sunlight, is passed through clouds or a prism, it can be
split up into its constituent colours.
The colours (wavelengths) that we can observe are in the visible
region of the electromagnetic spectrum.
The colour of an object that is illuminated by white light can be explained by the
subtractive colour model. If the object absorbs a specific colour of light, that colour is
“subtracted” from the light that is reflected from, or transmitted through, the object.
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