Chapter 8 – Chemical Composition
Name
Hour
State Standards
Standard 4: Reactions and Stoichiometry
-------------------------------------------------------------------------------------------------------------------Core Standard
Use balanced chemical equations and the mole concept to determine the quantities of reactants and products.
------------------------------------------------------------------------------------------------------------------ C.4.3 Given mass of the sample, use the mole concept to determine the number of moles and number of atoms
or molecules in samples of elements and compounds.
 C.4.4 Using a balanced chemical equation, calculate the quantities of reactants needed and products made in a
chemical reaction that goes to completion.
 C.4.7 Perform calculations to determine the composition of a compound or mixture when given the formula.
Chapter 8 Objectives
8.1 – Counting by Weighing
1.
do p 239 #1
Use the concept of average mass to “count by weighing”
8.2 – Atomic Mass
do p 240 #5, 7
2.
Use the periodic table to identify the average atomic mass of elements
3.
Apply the “count by weighing” concept to average atomic mass and numbers of atoms
8.3 – The Mole Concept
do p 240 #9, 11, 17, 19 (a,b,e), 21, 23 a,b,c,g)
4.
Use the mole concept and Avogadro’s number to relate mass measured in grams to the number of atoms in a
sample
5.
Perform calculations using Avogadro’s number (atoms  moles, moles  atoms)
8.4 – Solving Problems with Dimensional Analysis
6.
Develop strategies for solving problems in Chemistry
8.5 – Molar Mass
do p 241 #27, 29, 31 (b,c,d,e), 33 (a,d,e,f)
7.
Define “molar mass”
8.
Determine the molar mass of substances
9.
Perform calculations involving molar mass (grams  moles, moles  grams)
8.6 – Percent Composition
10.
do p 242 #45
Determine the mass percent of elements present in a compound
8.7, 8.8 & 8.9 – Empirical Formula and Molecular Formula
do p 243-244 #57, 61, 63, 65, 75, 79
11.
Define empirical. Explain the concept of an empirical formula
12.
Calculate the empirical formula of a compound
13.
Compare and contrast empirical formula and molecular formula
14.
Calculate the molecular formula of a compound