# CHEMISTRY SOL 4 REVIEW by wulinqing

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CHEMISTRY SOL 4 REVIEW
UNIT 9 – Molar Conversions

 Calculate the following:
2.11 x 1023
 0.35 mol F = _________ atoms F
1.96 x 1024
 3.25 moles CO2 = ________molecules
165.23
 2.6 moles Cu = _______ g Cu
0.07
 4.23 g NaCl = ________ moles NaCl
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
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
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
UNIT 10 - Stoichiometry

 What is the mole ratio of Al:Br in the
following equation?
2Al (s) + 3Br2 (l)  2AlBr3 (s)
 2:3
 How many moles of O2 are produced
when 2.35 moles of CO2 break down?
CO2  C + O2
 2.35 moles
UNIT 10 - Stoichiometry
 LiOH + HBr  LiBr + H2O
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
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
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%
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
UNIT 11 – Gas Laws

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

 What’s 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
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
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
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
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
UNIT 12 - Solutions

 In terms of solubility, polar substances
tend to dissolve in _______________
substances.
 Other polar
 Why won’t oil and water stay mixed?
 Oil is nonpolar, water is polar
 List two ways you can speed the dissolving
process.
 Stirring, Heating
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
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
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
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
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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