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Chapter 03

# Chapter 03 - Chapter 3 Measurement Tool of Chemistry...

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Chapter 3 Measurement Tool of Chemistry: Measured Quantities and their units The Importance of Measurements If we are going to conduct reactions, we need to know how much, in other words, provide quantitative assessments (vs qualitative) The entire global scientific community now uses a measurement system based on the metric system, known as the International System of Units, of SI units. The base SI units are summarized in Table 3.1. The ones we will be using in this course are Measurement Unit Symbol Length meter m Mass kilogram kg Time second s Temperature Kelvin K Amount of a substance mole mol Derived units The base SI units form the foundation for other measurements that are said to be derived from these base units. For example, area, is a derived unit. Area = length x length = meter x meter = (meter) 2 = m 2

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Table3.2 summarizes derived SI units commonly used in chemistry TABLE 3.2 Some Derived SI Units commonly Used in Chemistry Measurement Expression in Terms of Simpler Quantities Unit and Symbol Expression in Term of SI Base Units Area length × width square meter m 2 Volume length × width × height cubic meter m 3 Speed, velocity distance/time meter per second m/s Acceleration velocity/time meter per second squared m/s 2 Density mass/volume kilogram per cubic meter kg/m 3 Specific volume volume/mass cubic meter per kilogram m 3 /kg Force mass × acceleration newton, N 1 N = 1 kg m/s 2 Pressure force/area pascal, Pa 1 Pa = 1 N/m 2 = 1 kg m −1 s −2 Energy force × length joule, J 1 J = 1 Nm = 1 kg m 2 /s 2 Power energy/time watt, W 1 W = 1 J/s = 1 kg m 2 /s 3
Decimal multipliers SI prefixes shown in Table 3.3 TABLE 3.3 Decimal Multipliers That Serve as SI Prefixes Prefix Meaning

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Chapter 03 - Chapter 3 Measurement Tool of Chemistry...

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