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Chapter 2: Analyzing DataChapter 2: Analyzing Data
CHEMISTRY
Matter and Change
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Section 2.1 Units and Measurements
Section 2.2 Scientific Notation and Dimensional Analysis
Section 2.3 Uncertainty in Data
Section 2.4 Representing Data
ExitClick a hyperlink to view the corresponding slides.
CHAPTER
2 Table Of Contents
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• Define SI base units for time, length, mass, and temperature.
mass: a measurement that reflects the amount of matter an object contains
• Explain how adding a prefix changes a unit.
• Compare the derived units for volume and density.
SECTION
2.1 Units and Measurements
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base unit
second
meter
kilogram
Chemists use an internationally recognized system of units to communicate their findings.
kelvin
derived unit
liter
density
SECTION
2.1 Units and Measurements
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• Système Internationale d'Unités (SI) is an internationally agreed upon system of measurements.
• A base unit is a defined unit in a system of measurement that is based on an object or event in the physical world, and is independent of other units.
SECTION
2.1 Units and Measurements
Units
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SECTION
2.1 Units and MeasurementsSECTION
2.1 Units and Measurements
Units (cont.)
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SECTION
2.1 Units and Measurements
Units (cont.)
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• The SI base unit of time is the second (s), based on the frequency of radiation given off by a cesium-133 atom.
• The SI base unit for length is the meter (m), the distance light travels in a vacuum in 1/299,792,458th of a second.
• The SI base unit of mass is the kilogram(kg), about 2.2 pounds
SECTION
2.1 Units and Measurements
Units (cont.)
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• The SI base unit of temperature is the kelvin (K).
• Zero kelvin is the point where there is virtually no particle motion or kinetic energy, also known as absolute zero.
• Two other temperature scales are Celsius and Fahrenheit.
SECTION
2.1 Units and Measurements
Units (cont.)
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• Not all quantities can be measured with SI base units.
• A unit that is defined by a combination of base units is called a derived unit.
SECTION
2.1 Units and Measurements
Derived Units
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• Volume is measured in cubic meters (m3), but this is very large. A more convenient measure is the liter, or one cubic decimeter (dm3).
SECTION
2.1 Units and Measurements
Derived Units (cont.)
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• Density is a derived unit, g/cm3, the amount of mass per unit volume.
• The density equation is density = mass/volume.
SECTION
2.1 Units and Measurements
Derived Units (cont.)
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Which of the following is a derived unit?
A. yard
B. second
C. liter
D. kilogram
Section CheckSECTION
2.1
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What is the relationship between mass and volume called?
A. density
B. space
C. matter
D. weight
Section CheckSECTION
2.1