What the Final Looks Like

1
What the Final Looks Like

• I. Recently Covered Material
• A. Matching Dfn (1 pt) 10 terms, 15 dfn
• B. 30 MC (3 pts) more organic (20) than redox
  (10)
• II. Comprehensive Portion
• A. Matching Dfn (1 pt) 20 terms, 26 dfn
• B. 40 MC (2 pts) pretty evenly distributed
• U1 3 U2 6 U3 4 U4 5 U5 3 U6 5 U7 5
  U8 5 U9 4
• Expect to take 59.3-79.0 min

2
Final Exam Review Questions

• ___ Electron
• ___ Neutron
• ___ Proton
• ___ Isotope
• ___ Nucleus
• ___ Valence electron
• ___ s electron
• ___ p electron

• A. has a mass of 1 amu
• B. negatively charged particle
• C. occupies the space closest to the nucleus
• D. 22Ne and 20Ne
• E. hourglass-shaped orbital
• F. formula used to determine how many electrons
  a shell will hold
• G. Charge 1, mass 1 amu
• H. Contains protons and neutrons
• I. Outer electrons

3
Final Exam Review Questions

• _B_ Electron
• _A_ Neutron
• _G_ Proton
• _D_ Isotope
• _H_ Nucleus
• _I_ Valence electron
• _C_ s electron
• _E_ p electron

• A. has a mass of 1 amu
• B. negatively charged particle
• C. occupies the space closest to the nucleus
• D. 22Ne and 20Ne
• E. hourglass-shaped orbital
• F. formula used to determine how many electrons
  a shell will hold
• G. Charge 1, mass 1 amu
• H. Contains protons and neutrons
• I. Outer electrons

4
Final Exam Review Questions
5
Final Exam Review Questions

• Does a graph of course percentage as a function
  of class periods missed depict a hypothesis, a
  theory, or a law?
• The graph depicts a law It describes what
  happens, that students who miss class to not do
  well. In showing the data, we make no attempt to
  tell how or why this phenomenon occurs.

6
Final Exam Review Questions

• Balance the reaction
• KClO3 C12H22O11 ----gt KCl CO2 H2O

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Final Exam Review Questions

• 8 KClO3 C12H22O11 ----gt 8 KCl 12 CO2 11 H2O
• How many atoms of oxygen are involved in the
  reaction? (8x3) 11 35
• How many molecules of CO2 exist? 12
• If we begin the reaction with 1 mole KClO3, how
  many moles of water will we end up with?
• 1 mol KClO3 (11 mol H2O/8 mol KClO3)1.38 mol

8
Final Exam Review Questions

• 8 KClO3 C12H22O11 ----gt 8 KCl 12 CO2 11 H2O
• If we begin the reaction with 1 mole KClO3, how
  many molecules of KCl will we end up with?
• 1 mol KClO3 (8 mol KCl/8 mol KClO3)1 mol KCl
• 1 mol KCl (6.02 x 1023 molecules KCl/1 mol KCl)
  6.02 x 1023 molecules

9
Final Exam Review Questions

• A technician determines the mass of an meteorite
  to be 27.576 g. How many significant figures are
  present in this measurement? 5
• The same meteorites volume was determined to be
  17.0, 17.1 and 17.0 mL in triplicate
  determinations. Is this measurement accurate? We
  assume yes Is it precise? Yes, the three
  measurements are very close

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Final Exam Review Questions

• What is the density of the meteorite?27.576g/17.03
  mL 1.50 g/mL
• Are either of these measurements recorded in an
  SI unit? No, mass SI unit is kg volume is m3

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Final Exam Review Questions

• Suppose I dissolve 25 g H2SO4 and 25 g Al(OH)3 in
  0.750 L H2O.
• Will a chemical reaction occur? What type of
  chemical reaction will it be? Yes, an acid-base
  rxn
• Write the balanced chemical reaction which
  occurs.
• 3 H2SO4 2 Al(OH)3 ----gt 6 H2O Al2(SO4)3
• Write the total and net ionic reactions.
• Total
• 6 H 3 SO42- 2 Al3 3 OH- ---gt 6 H2O 2
  Al3 3 SO42

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Final Exam Review Questions

• 3 H2SO4 2 Al(OH)3 ----gt 6 H2O Al2(SO4)3
• Write the total and net ionic reactions.
• Net ionic reaction
• 6 H 3 OH- ---gt 6 H2O
• What is the limiting reagent? H2SO4
• 25 g H2SO4 (1 mol H2SO4/98.0 g H2SO4)0.26 mol
• 25 g Al(OH)3 (1 mol Al(OH)3 /78.0 g
  Al(OH)3)0.32 mol
• What is the molarity of the excess reactant?

13
Final Exam Review Questions

• What is the molarity of the excess reactant?
• 3 H2SO4 2 Al(OH)3 ----gt 6 H2O Al2(SO4)3
• 0.255 mol H2SO4 0.321 mol Al(OH)3 ----gt 0.255
  mol H2O 0.255 mol Al2(SO4)3
• Therefore, we will have 0.321-0.255 mol Al(OH)3
  or 0.0655 mol Al(OH)3 left over, in 0.750 L.
• molarity mol/L
• 0.0655 mol/0.750 L
• molarity 0.087 M