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CHEMISTRY FINAL REVIEW

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

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CHEMISTRY FINAL REVIEW

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  1. CHEMISTRY FINAL REVIEW

  2. 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

  3. Stoichiometry • 11 multiple choice & 1 open-ended • 1-step • 3-step • Limiting reactant • Percent yield • Use your stoichiometry road map!

  4. EXAMPLE 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 g B. 23.9 g C. 47.8 g D. 95.6 g

  5. Percent Composition, Empirical & Molecular Formulas • 6 multiple choice • Calculating % composition • Calculating Empirical/Molecular Formulas • Identifying Empirical Formulas

  6. Solutions • 4 multiple choice & 1 open-ended • Calculating molarity • Calculating grams from molarity • Using molarity as a conversion factor • Calculating % yield

  7. 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

  8. 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 He B. 25400 mol He C. 207 mol He D. 1.38 mol He

  9. Graph Interpretation • 3 questions • Directly proportional relationship • Indirectly proportional relationship

  10. 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

  11. 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 grams c. 7.2 grams d. 13.0 grams

  12. 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 hours c. 6 hours d. 4 hours

  13. 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 amu c. 6.52 amu d. 6.94 amu

  14. Practice Problems • Example: Carbon-14 emits a beta particle as it undergoes radioactive decay to form nitrogen-14. •  ___ + •  ___ + •  ___ + • ___ +

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