# Introduction: Matter and Measurement - PowerPoint PPT Presentation

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## Introduction: Matter and Measurement

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### Chapter 1 Introduction: Matter and Measurement * Properties of Matter Physical property: a property that can be observed without changing the identity and composition ... – PowerPoint PPT presentation

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Title: Introduction: Matter and Measurement

1
Chapter 1
• Introduction Matter and Measurement

2
Properties of Matter
• Physical property a property that can be
observed without changing the identity and
composition of the substance

Chemical property a property that describes the
way a substance may react to form other substances
3
Properties of Matter
• Intensive property a property that depends on
the identity of the substance

Extensive property a property that depends on
the amount of the substance
4
Changes in Matter
• Physical change a substance changes its
physical appearance but not its composition

Chemical change a substance is transformed in a
chemically different substance
5
Units of Measurement
6
SI Units
7
Metric System
8
Temperature
• The Celsius and Kelvin scales are those commonly
used in science.

0 C 273 K
9
Derived Units
• Volume and density are considered derived units
because they are made up of SI units.

10
Uncertainty in Measurements
11
Significant Figures
• 1) All nonzero digits are significant
• 2) All zeros in between nonzero digits are
significant
• 3) Zero at the beginning of a number are never
significant

74198 has 5 sig figs
3705 has 4 sig figs
0.0064 has 2 sig figs
12
Significant Figures
• 4) Zeros at the end of a number are only
significant if there is a decimal in the number
• 5) Counted numbers and conversion factors have
an unlimited number of sig figs

13
Significant Figures
• When you add or subtract using sig figs, the
answer has the same number of decimal places as
the number with the least decimal places.
• When you multiply or divide using sig figs, the
answer has the same number of sig figs as the
number with the least sig figs.

14
Accuracy and Precision
• Accuracy how close a measurement is to its
correct value
• Precision how closely individual measurements
agree with one another