Virscend Education International Department
Lesson Planner
Subject: Chemistry
Teacher: Melanie Wang
Lesson Title: VSEPR model
Scheme of Work/ Unit: 7.5
Date: 20200605
Class: AP 2
Number of Students: 26
Period: Fri 6 & Mon 3
Learning objectives (know, understand, be able to):
 Know what bond angle is and what VSEPR model is.
 Understand what steric number is.
 Be able to predict the geometry of molecules using VSEPR model.
 Be able to draw a three-dimensional representation of a molecule.
Time
Teacher Activity
(min)
Preparation
Before the class starts, ask students to
rearrange the desks and sit as groups.
Student Activity
Rearrange the desks and be ready to
start.
Ask students to take their textbook and
chemistry folder with them and sit in their
new seating arrangement.
3
Starter
Draw a Lewis diagram for methane on the
board.
Answer the question.
Ask students “what angles does this
diagram suggest between each C-H
bond?”
7
Introduce bond angles and molecular
geometry to students.
Introduce today’s learning objectives.
Explain the unfamiliar terminology.
Introduce VSEPR model to students.
Page 1 of 4
Fill out the handouts.
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10
Main Activity
Activity:
Explain that the knot holding the strings
together represents a central atom and the
strings represent electron pairs coming off
the central atom. Have students form small
groups in various parts of the room (they
will need space to move in order to
experiment with different “bond”
arrangements with their string sets).
Explain that the knot holding the strings
together represents a central atom and the
strings represent electron pairs coming off
the central atom.
Using two balloons tied together,
demonstrate how the balloons occupy
space and repel each other. Explain how
the molecular is linear.
Ask students to tie three and four balloons
together. Ask them to think what shape it
is.
Work in group. Think in which way
could the balloons be as far apart as
possible.
Fill out the handouts.
Summarize and project each kind of
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Use balls and sticks to set up
Virscend Education International Department
situation on PPT.
molecular geometry.
Fill out the handouts.
20
Introduce steps to determine molecular
geometry.
Show how to determine CO2, CO32-,CH4.
5
review
20
Fill out the handouts.
Do exercise.
Review the model and examples. Ask
individuals to answer questions.
Answer questions
Ask students what it would be like if one
balloon is larger, representing a larger
electron density.
Figure out the influence of lone pairs
using balloons.
Introduce the molecular geometry with
Fill out the handouts.
SO2,NH3, H2O. Ask students to do exercise
after each demonstration.
Do the exercises.
10
summary
Summarize the molecular shapes in the
chart.
Fill out the handouts.
Summarize the steps to determine
molecular shapes.
5
More exercises.
English in the lesson
 Reading: students need to read the definitions and questions projected on the
PowerPoint during the lesson, and their handout and project instruction after the
lesson.
 Writing: students need to take notes in English and complete their homework
in English.
 Listening: English is used as the teaching language with only some




Reading
Writing
Listening
Speaking
Do the exercises.
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explanations in Chinese.
 Speaking: students need to answer all questions in English.
Differentiation
Strategies
 Difficult questions and activities will be directed to more able students. Easier
questions and activities will be given to less capable students.
 Different requirements on their homework quality.
Assessment
 The acitivity is designed for students to better understand a three-dimensional
world since I found students’ such ability is so poor and they can not possibly
imagine.
 Students will do many exercises to get familiar with how to figure out the
molecular shapes.
Strategies
Lesson Reflection
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