chemistry final review
DESCRIPTION
CHEMISTRY FINAL REVIEW. Types of Questions. 45 multiple choice 4 open ended 1 Molarity calculation 1 Complete nuclear reaction and name types of radiation 1 Gas law calculation 1 Stoichiometry calculation. Stoichiometry. 11 multiple choice & 1 open-ended 1-step 3-step - PowerPoint PPT PresentationTRANSCRIPT
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CHEMISTRY FINAL REVIEW
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Types of Questions
• 45 multiple choice• 4 open ended
• 1 Molarity calculation• 1 Complete nuclear reaction and
name types of radiation• 1 Gas law calculation• 1 Stoichiometry calculation
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Stoichiometry
• 11 multiple choice & 1 open-ended• 1-step• 3-step• Limiting reactant• Percent yield• Use your stoichiometry road map!
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Iron (III) oxide is formed when iron combines with oxygen in the air.
How many grams of Fe2O3 are formed when 16.7 g Fe reacts completely with oxygen?
4 Fe + 3 O2 2 Fe2O3
A. 12.0 gB. 23.9 gC. 47.8 gD. 95.6 g
EXAMPLE
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Percent Composition, Empirical & Molecular Formulas
• 6 multiple choice• Calculating % composition• Calculating Empirical/Molecular
Formulas• Identifying Empirical Formulas
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Solutions
• 4 multiple choice & 1 open-ended• Calculating molarity• Calculating grams from molarity• Using molarity as a conversion factor• Calculating % yield
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Gas Laws• 7 multiple choice & 1 open-ended• Combined Gas Law• Boyles Law• Ideal Gas Law• Charles Law• Use your Gas Laws formulas and
constants• STP• The properties of an ideal gas• Kinetic Theory
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EXAMPLE
When the temperature of a flask containing 685 L of helium gas is held at 621 K, the pressure of the gas is 1890 kPa.
How many moles of helium does the flask contain?
A. 251 mol HeB. 25400 mol HeC. 207 mol HeD. 1.38 mol He
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Graph Interpretation
• 3 questions• Directly proportional relationship• Indirectly proportional relationship
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Nuclear Reactions & Atomic Structure• 14 multiple choice & open-ended • Atomic structure
• Isotopes, atomic number, mass number, properties of subatomic particles
• Complete nuclear reactions• Identify types of radiation• Half-life calculations• Calculate average atomic mass
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Example Problems• The half-life of Zinc-71 is 2.4
minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed? a. 25.0 grams
b. 12.5 gramsc. 7.2 gramsd. 13.0 grams
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Example Problem
• There is 1,728 grams of a radioactive material. After 24 hours there is 27 grams remaining. What is the half-life of the material? a. 24 hours b. 12 hoursc. 6 hours d. 4 hours
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Example Problem
• What is average atomic mass of Lithium if 7.42% exists as 6Li (6.015 amu) and 92.58% exists as 7Li (7.016 amu)?
a. 7.42 amu b. 7.02 amuc. 6.52 amu d. 6.94 amu
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Practice Problems
___ +
___ +
___ +
___ +
Bi21483
He42
Pu24694
Am24695
B95 Li53
Bi21483 e01
Example: Carbon-14 emits a beta particle as it undergoes radioactive decay to form nitrogen-14.