CHEM 120A – Autumn 2011
Review for Exam 1
Chapter 1 – Measurements
Section 1.1 – Units of Measurement

Write the names and abbreviations for the units used in measurement of mass, length and
volume.

Know differences between metric and SI systems

Be able to identify the type of measurement given a number with a unit

Extra Exercises:
1.1, 1.3
Section 1.2 – Scientific Notation

Be able to express numbers in scientific notation

Be able to convert scientific notation to a standard number

Extra Exercises:
1.5, 1.7, 1.9
Section 1.3 – Measured Numbers and Significant Figures

Know the difference between a measured number and an exact number

Know how to determine the number of significant figures in a measured number

Be able to determine if zeros in a number are significant

Extra Exercises:
1.13, 1.15, 1.17, 1.19, 1.21
Section 1.4 – Significant Figures in Calculations

Be able to adjust calculated answers to the correct number of significant figures

Know the rules for rounding off

Know how to determine the correct number of significant figures when performing
multiplication and division

Know how to determine the correct number of significant figures when performing addition and
subtraction

Be able to express an answer with the correct number of significant figures when performing
combined mathematical functions (i.e. addition and multiplication)

Know when it is necessary to add significant zeros

Extra Exercises:
1.23, 1.27, 1.29
Section 1.5 – Prefixes and Equalities

Be able to use numerical values of prefixes to write a metric equality
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Memorize the prefixes (their numerical value, scientific notation, equality and symbol) that we
will commonly encounter in this course:
mega, kilo, deci, centi, milli, micro, and nano

Know how to write equalities

Extra Exercises:
1.35, 1.37, 1.37, 1.39, 1.41
Section 1.6 – Writing Conversion Factors

Be able to write conversion factors for two units that describe the same quantity

Memorize the metricU.S. equality:
1 in = 2.54 cm

Know how to write metric conversion factors

Be able to write conversion factors that are stated in a problem

Know what is meant by ppm, ppb and percentage and be able to write these as conversion
factors

Extra Exercises:
1.45, 1.47, 1.49
Section 1.7 – Problem Solving

Be able to use conversion factors to change from one unit to another

Extra Exercises:
1.51, 1.53, 1.55, 1.57, 1.59, 1.61
Section 1.8 – Density

Be able to calculate the density of a substance given mass and volume

Be able to use volume displacement data to calculate density

Know what is meant by specific gravity and be able to solve problems with specific gravity

Be able to use the density of a substance to calculate mass of volume of a substance

Extra Exercises:
1.63, 1.65, 1.67, 1.69
Additional Exercises – Chapter 1

1.71, 1.73, 1.77, 1.79, 1.81, 1.83, 1.85, 1.89, 1.91, 1.93, 1.97, 1.99, 1.105, 1.107, 1.109
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 Fall '11
 LeahMiller
 Scientific Notation, Atom, extra exercises

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