chemistry sol 4 review. unit 9 – molar conversions calculate the following: 0.35 mol f = _________...
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CHEMISTRY SOL 4 REVIEW
UNIT 9 – Molar Conversions
Calculate the following:0.35 mol F = _________ atoms F3.25 moles CO2 = ________molecules
2.6 moles Cu = _______ g Cu4.23 g NaCl = ________ moles NaCl
2.11 x 1023
1.96 x 1024
165.23
0.07
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
22.4What is the volume of 7.3 g of CO2 at STP?
3.72 LFind 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 LG 22.8 LH 67.2 LJ 91.9 L
UNIT 10 - Stoichiometry
What is the mole ratio of Al:Br in the following equation?
2Al (s) + 3Br2 (l) 2AlBr3 (s) 2:3How 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 + H2OIf you start with 10 grams of lithium hydroxide, how many grams of lithium bromide will be produced?
36.25 g2SO2 + 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 + KOHI began this reaction with 20 grams of LiOH and produced 31 g of LiCl. What is my percent yield?
Theoretical = 35.4 gPercent Yield = 87.6%
UNIT 11 – Gas Laws
Increasing the number of particles will ____________ the pressure of a gas.
IncreaseIncreasing volume will ________ the
pressure of a gas. DecreaseDecreasing the temperature will
_______________ the pressure of a gasDecrease
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?
KelvinIf 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 = P2V23.33 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/T20.71 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 = 0.0821n = 1.26 moles
UNIT 12 - Solutions
What units do we use when measuring molarity (M)?
moles/LHow 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 polarWhy 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?
KIHow 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/depressing2.0 L of a 0.88 M solution is diluted to 3.8 L. What is the new molarity?
M1V1 = M2V20.46 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 TQ = 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?
1What 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 ionsIf a substance has a pH of 3, what is its pOH?
11