Download - Drill #18 Jan. 8 & 9, 2013
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Drill #18 Jan. 8 & 9, 2013
• Take your time, do your own work, and draw the Lewis structure for HCN.
• Now, tell me the shape of this molecule.
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Agenda• Molecular Geometry Quiz• Review Practice Problems• Review Worksheet – due on Friday!
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Objectives• For a complete listing of Midterm
objectives, see the Midterm County Assessment Teacher’s Guide.
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Topics Covered• Chapter 1 (Measurements)• Chapter 2 (Energy & Matter)• Chapter 3 (Atomic Structure)• Chapter 4 (Electron Configurations)• Chapter 5 (The Periodic Table)• Chapter 6 (Groups of Elements)• Chapter 7 (Chemical
Bonding/Formulas)• Chapter 8 (Shapes of Molecules)
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Chemistry Midterm Review
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Practice Problem• Identify the number of protons,
neutrons, and electrons in the following ion: 34Cl1-
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Answer• 17 protons; 18 electrons; 17
neutrons
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Practice Problem• Identify the number of significant
figures in the following measurements: (a) 2.0045 meters; (b) 0.00045 seconds; (c) 8.00200 ms; (d) 4500 cm
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4 rules for determining sig figs
• Non-zero numbers are always significant
• Zeros between non-zero numbers are always significant
• Zeros that act as placeholders are not significant0.0253 has 3 sig figs4320 has 3 sig figs
• All zeros at the end are significant when there is a decimal point after an integer6.20 has 3 sig figs
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Answers a) 5
b) 2 c) 6
d) 2
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• Convert 254 cm to meters• Convert 60 mg to kg
King Henry Does Usually Drink Chocolate Milk
Base
Kilo hecto deka UNIT deci centi milli
Practice Problems
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Answers• 2.54 m• 0.000060 kg
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Practice Problem• Identify the number of protons,
neutrons, and electrons in the following ion: 59Ni2+
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Answers• 28 protons
• 31 neutrons
• 26 electrons
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Practice Problem• Write the electron configuration
using both sublevel notation and orbital diagram notation for sulfur.
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Answer• 1s22s22p63s23p4
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Practice Problem• Which atom has the larger
atomic radius: Ca, Sr, or Ba? Why?
• Which atom has the greatest ionization energy: Ca, Sr, or Ba? Why?
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Answers• Barium (Ba) – largest radius
• Calcium (Ca) – greatest ionization energy
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Review• What is an isotope?
• What is an ion?
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Review• Isotope = atoms of a particular
element contain the same number of protons but may have a distinct number of neutrons.
• Ion = atom or molecule in which the total number of electrons is not equal to the total number of protons, giving it a net positive or negative charge.
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Practice Problem• Write the electron configuration
using sublevel notation for strontium (Sr).
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Answer• 1s22s22p63s23p64s23d104p65s2
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Practice Problem• Write the formulas for the
following: (a) barium carbonate, (b) sodium phosphate, and (c) carbon tetrachloride
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Answers• a) BaCO3
b) Na3PO4
c) CCl4
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Review Question• Name the following compound:
• Cu(BrO3)2
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Answer• Copper(II) bromate
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Homework• Complete page 1 of Review Sheet• Due on Thursday!