CHEM 120A – Autumn 2011
Review for Exam 2
Chapter 6 – Chemical Reactions and Quantities
Section 6.1 – Chemical Reactions

Know the types of visible evidence that a chemical reaction has occurred

Know the symbols used in writing chemical equations

Write a balanced chemical equation from the formulas of reactants and products

Extra Exercises:
6.1, 6.3, 6.5
Section 6.2 – Types of Reactions

Be able to identify a chemical reaction as either a combination, decomposition, single
replacement or double replacement reaction

Extra Exercises:
6.9, 6.11
Section 6.3 – OxidationReduction Reactions

Be able to define the terms oxidation and reduction

Identify which species in a reaction is oxidized and which is reduced

Extra Exercises:
6.13, 6.15, 6.17
Section 6.4 – The Mole

Know what is meant by a collection term

Know Avogadro’s number (6.02 x 10
23
)

Be able to use Avogadro’s number to determine the number of particles in a given number of
moles

Calculate the number of moles of element in a formula

Extra Exercises:
6.23, 6.25, 6.27, 6.29
Section 6.5 – Molar Mass

Be able to determine the molar mass of a substance

Calculate the molar mass of a compound

Use the molar mass to convert between grams and moles

Extra Exercises:
6.31, 6.33, 6.35, 6.37, 6.39, 6.41, 6.43
Section 6.6 – Mole Relationships in Chemical Equations

Know what is meant by conservation of mass
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Know what information is available from a balanced chemical equation

Write molemole factors from an equation

Use molemole factor from balanced chemical equation to calculate the moles of another
substance in the reaction

Extra Exercises:
6.45, 6.47, 6.49
Section 6.7 – Mass Calculations for Reactions

Be able to calculate the mass in grams of one substance in a reaction when given the mass of
another substance in that reaction

Extra Exercises:
6.51, 6.53, 6.55, 6.57
Section 6.8 – Percent Yield and Limiting Reactants

Know the difference between actual and theoretical yield

Be able to calculate the percent yield of a product, or use the percent yield to determine
starting amounts

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 Fall '11
 LeahMiller
 Chemistry, Reaction, Chemical reaction, extra exercises

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