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CHEMISTRY SOL 4 REVIEW

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CHEMISTRY SOL 4 REVIEW UNIT 9 Molar Conversions Calculate the following: 0.35 mol F = _____ atoms F 3.25 moles CO2 = _____molecules 2.6 moles Cu = _____ g ... – PowerPoint PPT presentation

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Title: CHEMISTRY SOL 4 REVIEW


1
CHEMISTRY SOL 4 REVIEW
2
UNIT 9 Molar Conversions
  • Calculate the following
  • 0.35 mol F _________ atoms F
  • 3.25 moles CO2 ________molecules
  • 2.6 moles Cu _______ g Cu
  • 4.23 g NaCl ________ moles NaCl

2.11 x 1023
1.96 x 1024
165.23
0.07
3
2009 SOL question
  • The number of molecules in 48.0 g of oxygen gas
    (O2) is
  • A 6.02 x 1023
  • B 9.03 x 1023
  • C 1.20 x 1024
  • D 1.81 x 1024

4
UNIT 9 Molar Conversions
  • At STP, 1 mole of any gas occupies ______ Liters
  • 22.4
  • What is the volume of 7.3 g of CO2 at STP?
  • 3.72 L
  • Find the density of O2 gas at STP.
  • 1.43 g/L

5
2009 SOL question
  • What is the volume occupied by 51 g of NH3 gas at
    STP?
  • F 0.439 L
  • G 22.8 L
  • H 67.2 L
  • J 91.9 L

6
UNIT 10 - Stoichiometry
  • What is the mole ratio of AlBr in the following
    equation?
  • 2Al (s) 3Br2 (l) ? 2AlBr3 (s)
  •  23
  • How many moles of O2 are produced when 2.35 moles
    of CO2 break down?
  • CO2 ? C O2
  • 2.35 moles

7
UNIT 10 - Stoichiometry
  • LiOH HBr ? LiBr H2O
  • If you start with 10 grams of lithium hydroxide,
    how many grams of lithium bromide will be
    produced?
  • 36.25 g
  • 2SO2 O2 ? 2SO3
  • What is the limiting reactant if you have 0.25
    moles of each reactant?
  • SO2

8
2009 SOL question
  • If a student starts with 21.7 g of NH3, how many
    grams of hydrogen (H2) gas will be produced by
    the reaction?
  • 2NH3 ? N2 3H2
  • 3.85 g

9
UNIT 10 - Stoichiometry
  • LiOH KCl ? LiCl KOH
  • I began this reaction with 20 grams of LiOH and
    produced 31 g of LiCl. What is my percent yield?
  • Theoretical 35.4 g
  • Percent Yield 87.6

10
UNIT 11 Gas Laws
  • Increasing the number of particles will
    ____________ the pressure of a gas.
  •  Increase
  • Increasing volume will ________ the pressure of a
    gas.
  •  Decrease
  • Decreasing the temperature will _______________
    the pressure of a gas
  • Decrease

11
UNIT 11 Gas Laws
  • Draw a graph to show the relationship of volume
    and pressure.

12
UNIT 11 Gas Laws
  • Whats the partial pressure of oxygen in a
    balloon filled with O2 and N2 if the total
    pressure in the balloon is 810 mmHg and the
    partial pressure of N2 is 610 mmHg?
  • 200 mmHg

13
UNIT 11 Gas Laws
  • When using any of the gas laws, what unit must
    you use for TEMPERATURE?
  •  Kelvin
  • If we took 2.00 liters of a gas at 1.00 atm and
    compressed it to a pressure of 6.00 x 104 atm,
    what would the new volume of that gas be?
  • P1V1 P2V2
  • 3.33 x 10-5 L

14
UNIT 11 Gas Laws
  • If a balloon initially has a volume of 0.4 liters
    and a temperature of 20oC, what will the volume
    be after it is heated to a temperature of 250oC?
  • V1/T1 V2/T2
  • 0.71 L

15
UNIT 11 Gas Laws
  • If I have an unknown quantity of gas at a
    pressure of 1.2 atm, a volume of 31 liters, and a
    temperature of 87oC, how many moles of gas do I
    have?
  • PV nRT R 0.0821
  • n 1.26 moles

16
UNIT 12 - Solutions
  • What units do we use when measuring molarity (M)?
  •  moles/L
  • How many moles of HCl are needed to make 675 mL
    of a 2.0 M solution?
  • 1.35 moles

17
UNIT 12 - Solutions
  • In terms of solubility, polar substances tend to
    dissolve in _______________ substances.
  •  Other polar
  • Why wont oil and water stay mixed?
  •  Oil is nonpolar, water is polar 
  • List two ways you can speed the dissolving
    process.
  •  Stirring, Heating 

18
UNIT 12 - Solutions
  • Which salt is most soluble at 10oC?
  •  KI
  • How many grams of KCl can be dissolved in 200 g
    of water at 80oC?
  • 100 g KCl

19
UNIT 12 - Solutions
  • Adding salt to ice or water alters it by
    _____________ the freezing point.
  • Lowering/depressing
  • 2.0 L of a 0.88 M solution is diluted to 3.8 L.
    What is the new molarity?
  • M1V1 M2V2
  • 0.46 M

20
UNIT 13 Everything Else
  • How is molar heat capacity different from
    specific heat capacity?
  •  Molar heat capacity talks about raising the temp
    of 1 mole, specific heat is 1 gram
  • How many joules of heat are given off when 120
    grams of water are cooled from 25oC to 10oC? The
    heat capacity of ice is 2.09 J/goC.
  • Q mc T
  • Q 3762 J

21
UNIT 13 Everything Else
  • What kind of chemical would you use to neutralize
    an acid spill in a lab?
  •  Base (Ammonia, Sodium bicarbonate)
  • What is the pH of a 0.1 M solution of a strong
    acid?
  •  1
  • What is the pH of a 0.36 M solution of the strong
    base NaOH?
  • 13.55

22
UNIT 13 Everything Else
  • What does pH measure?
  • Concentration of hydrogen ions
  • If a substance has a pH of 3, what is its pOH?
  • 11
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