Bell WORK

Write down 1 qualitative observation
 Write down 1 quantitative observation
 Write down a demo you’ve seen that you’d
like to try in here
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Zumdahl Zumdahl DeCoste
World of
CHEMISTRY
Chapter 1
Chemistry:
An
Introduction
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Properties

Macroscopic properties: properties that can
be determined via our 5 senses w/o any
further magnification
 Microscopic properties: properties that
require magnification to determine (atomic
level)
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4
Lab safety

-clothes catch fire, large chemical spill
 - chemicals get into eyes
 -small fires
 -wafting
 Beaker, Erlenmeyer, grad. Cylinder,
evaporating dish, ring stand, ring, wire
gauze, goggles, tongs, fire extinguisher, fire
blanket, eye wash station
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Figure1.1:
The
various
parts of
the
scientific
method.
Observation – can
be qualitative or
quantitative
Once we have a set
Of Hypotheses
That agree, we
Formulate a theory
Hypothesis – a
possible
explanation for
observation
General observations
That always occur
Are formulated into
A law
Experiments –
something we do
to test the
hypothesis
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1.5 The Scientific Method
“A law tells us what happens; a theory tells
us why it happens”
 Law = A summary of observed behavior
 Theory = An explanation of behavior

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1.2 What is Chemistry

Chemistry is a science that deals with the
materials of the universe and the changes
that these materials undergo.
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Chemical change

Examples of chemical change
– Wood burns to form water, CO2, and other stuff
– A plant grows by assembling materials
– Steel car rusts
– Emissions of a power plant lead to ???
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Problem solving
1.
2.
3.
Recognize the problem (observations)
Propose possible solutions(hypothesis)
Decide which solution is best and try it
(experiment)
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10
Figure 1.2: Student-centered learning.
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