Module 20 — Graphing
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Calculations in Chemistry
Modules 19 and above have been re-numbered.
Module 19 – Graphing is now Module 20.
Module 20 – Spectra is now Module 21
If you are looking for Spectra topics, check Module 21
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Module 20 — Graphing
Module 20 – Graphing
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495
Lesson 20A:
Graphing Fundamentals
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495
Lesson 20B:
The Specific Equation for a Line
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504
Lesson 20C:
Graphing Experimental Data
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514
Lesson 20D:
Deriving Equations From Linear Data
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521
Lesson 20E:
Linear Equations Not Directly Proportional
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532
Lesson 20F:
Graphing Inverse Proportions
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539

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Module 20 — Graphing
©2010 ChemReview.net
v. 1m
Page
495
Module 20
—
Graphing
Timing
:
Begin this module when you are asked to make a line graph of data as part of a
lab report or other assignment.
Prerequisites
:
It will be helpful to do Lessons 17A, 18A and 18B prior to this module.
Provisions
:
You will need a pencil, eraser, and about 5-10 sheets of graph paper (quarter-
inch grid preferred), but you can begin the lessons without graph paper.
Pretests:
If you feel confident about your graphing ability, try the last graph in the problem
set at the end of each
lesson
.
If you can do the last graph easily, you should not need to do
the others.
If the last graph is difficult, complete the lesson.
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Lesson 20A:
Graphing Fundamentals
Graphs
A
graph
is a way to display
numbers visually.
There are many types of
graphs, including bar graphs,
pie charts, and histograms.
In
these lessons, our interest will
be limited to
line graphs:
a
type of graph often used
to
display experimental results.
An example of a line graph is
at the right.
Computer software can also
create graphs.
However, in
order to create a proper software graph, it is important to be able to do the basic graphing
operations without a computer.
Graphing Exercises
In the following lessons you will “learn by doing” several types of line graphs.
The
exercises will proceed from relatively easy to difficult.
The early examples can be solved in
easier steps, but the steps we practice on simple cases will make more complex and
computer graphs easier.
Please try the rules suggested here.
Tip #1:
Graph In Pencil
When making a graph by hand, use a pencil and eraser.
Simple or rough graphs may be
sketched in ink, but complex graphs may require draft numbers that are later erased.
P vs. V for Trapped Air
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Volume (L)
Pressure (atm)