
Exam 3 Review
Authored by Jack Mason
Chemistry
University
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32 questions
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1.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
A solution is prepared by dissolving 49.3g of NaCl in enough water to form 438mL of solution. Calculate the mass% of sodium chloride in the solution if the density of the solution is 1.06 g/mL
10.6% NaCl
11.3% NaCl
9.6% NaCl
12.7% NaCl
10.1% NaCl
2.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Suppose you have three beakers, labeled I-III, containing the following solutions:
I.) CuI2(aq)
II.) KC2H3O2(aq)
III.) CaSO4(aq)
If a solution of lead(II) nitrate, Pb(NO3)2, is added to each beaker, in which will a precipitate form?
Only beaker (II) will contain a precipitate
All three beakers will contain precipitates
Only beaker (I) will contain a precipitate
Only beaker (III) will contain a precipitate
Beakers (I) and (III) will contain precipitates
3.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
How many grams of sodium azide, NaN3 (molar mass = 65.02g/mol) are needed to react by the equation below in order to inflate a 66.0L air bag with N2(g) at 294K and 0.989atm pressure?
2NaN3(s) --> 2Na(s) + 3N2(g)
95.1g
44.2g
117g
60.1g
176g
4.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
How many molecules of gas are present in a 0.500L container of N2 at 25.0°C and 760. mmHg of pressure?
9.36 x 1024 molecules
1.23 x 1022 molecules
1.23 x 1023 molecules
7.55 x 1021 molecules
6.02 x 1023 molecules
5.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
What is the molarity of a HCl solution, if 15.78mL of the acid is needed to completely neutralize 10.00mL of a 0.2000M NaOH solution?
hint: think dilution
0.03156M HCl
31.56M HCl
7.890M HCl
0.3156M HCl
0.1267M HCl
6.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
An excess of nitric acid is added to 2.50g of copper metal.
Cu(s) + 4HNO3(aq) → Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l)
What is the volume of NO2 gas produced at a pressure of 1atm and temperature of 0°C (STP conditions)?
44.8L
0.881L
112L
1.76L
0.0787L
7.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Potassium nitrate, KNO3, is added to toothpaste at 5.00% by mass to treat tooth pain. How much potassium nitrate is contained in a 124g tube of toothpaste?
6.20g
130.g
4.24g
5.26g
118g
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