CC200 005 007 L2 SN 889433.indd Page NOS5 2/18/10 3:18:36 AM ... - Gabbart

Lesson 2 Measurement and Scientific Tools

Scan Lesson 2. Read the lesson titles and bold words. Look at the pictures. Identify three facts you discovered about measurement and scientific tools. Record your facts in your Science Journal.

Description and Explanation

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Relate the terms description and explanation to observations.

. Description

Explanation

of observations

Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.

The International System of Units

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.

Interpret the mathematical meaning of prefixes used in the International System of Units (SI).

Prefix

Mega Kilo Hecto Deka

Meaning

Prefix

Micro Milli Centi Deci

Meaning

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.

Identify the SI units for different measurements.

Quantity Measured

Length Mass Time Electric current Temperature Substance amount Light intensity

Unit

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.

Express each measurement in the proper SI unit.

One thousand of the base unit in length:

One millionth of the base unit in mass:

One thousandth of the base unit in time:

Scientific Explanations NOS 5

Lesson 2 | Measurement and Scientific Tools (continued)

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Explain models of accuracy and precision.

A

B

C

D

Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.

Target Description

Explanation

The arrow in the bull's-eye represents one measurement right on the accepted value.

accurate and precise

neither accurate nor precise

precise but not accurate

Measurement and Uncertainty

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Relate two factors that can limit the accuracy and precision of measurements.

.

Factors Affecting Measurement

NOS 6 Scientific Explanations

Lesson 2 | Measurement and Scientific Tools (continued)

Significant Digits

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Scientific Tools

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Classify numbers as significant digits, or not. Write S for

.

significant or N for not significant.

S or N?

Digits

all nonzero numbers zeros used solely for spacing a decimal point zeros between nonzero digits final zeros after a decimal point

Recognize the uses of scientific tools.

.

used to record descriptions, explanations, plans, and steps

measures the mass of objects

measures the temperature of substances

used to hold, pour, heat, and measure liquids

enables you to see objects too small to view with the eye

used to process data

Tools Used by Life Scientists

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Describe tools used by life scientists.

Tool

Description

Magnifying lens

Slide

Dissecting tools

Pipette

Connect It Make a generalization about the importance of tools to science.

Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.

Scientific Explanations NOS 7

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