Download Practice Exam 2 Sample - General Chemistry I | CHEM 1010 and more Exams Chemistry in PDF only on Docsity!
You should study your test, study your Handbook modules, and review your drill quizzes BEFORE taking this exam. When taking it you should do so under exam conditions, i.e. alone, using only a calculator and periodic table, and waiting until you have completely finished before checking your answers.
1: If 38.6 mL of 0.25 M hydrochloric acid are needed to completely neutralize 26.0 mL of a solution of barium hydroxide, what is the concentration of the barium hydroxide? (4-10)
A: 0.19 M B: 0.084 M C: 0.37 M D: 0.25 M E: 0.74 M
2: How many milliliters of 6.0 M periodic acid would be required to prepare 2.5*10^2 ml of 3.0 M periodic acid? (4- 6,7,8)
A: 5.010^1 mL B: 1.310^2 mL C: 2.510^2 mL D: 8.0 mL^ E: 5.010^2 mL
3: 0.23 moles of radon and 0.49 moles of fluorine are mixed together in a 3.9 liter container at 98˚C. What is the pressure exerted by the mixture? (5-6)
A: 5.6 atm B: 1.5 atm C: 3.8 atm D: 0.86 atm E: 1.8 atm
4: When carbon burns according to the reaction 2 C(s) + O 2 (g) ➞ 2 CO(g), the heat change is -110.5 kJ/mole of CO formed. How many grams of oxygen must react in this manner to produce 55.2 kJ?
A: 6.91 g B: 7.99 g C: 3.81 g D: 4.00 g E: 16.0 g
You should study your test, study your Handbook modules, and review your drill quizzes BEFORE taking this exam. When taking it you should do so under exam conditions, i.e. alone, using only a calculator and periodic table, and waiting until you have completely finished before checking your answers.
5: Choose the correct statements from the following using K-TYPE answer format. I.E. Mark a if A,B,C are correct; b if A, C; c if B, D; d if D only; e otherwise.
A: If sugar is dissolved in water, sugar is the solute. B: It would be possible to add water to a solution with a concentration of 0.20 M and produce a solution with a concentration of 0.40 M. C: At the same temperature and pressure, 1 mole of helium would weigh the same as one mole of nitrogen if both are ideal. (5-8) D: In an ideal gas in a sealed container at a constant pressure and temperature, the molecules constantly lose energy due to collisions. (5-8)
6: What is the final pressure of a sample of gas if its pressure was 1.33 atm before its volume was doubled and its temperature was tripled? (5-2,5)
A: 2.00 atm B: 0.867 atm C: 0.217 atm D: 7.98 atm E: 0.665 atm
7: What is the molecular weight of a gas if 1.00 g of the substance occupies 400 mL at 27 ˚C and 769 torr? (5-4)
A: 164 B: 62.3 C: 72.1 D: 54.8 E: 60.
8: Calculate the enthalpy change for the following reaction. C 2 H 4 (g) + 2 O 2 (g) ➞ 2 CO (g) + 2 H 2 O (l)
A: –449 kJ B: –344 kJ C: 845 kJ D: 449 kJ E: –845 kJ
You should study your test, study your Handbook modules, and review your drill quizzes BEFORE taking this exam. When taking it you should do so under exam conditions, i.e. alone, using only a calculator and periodic table, and waiting until you have completely finished before checking your answers.
13: ( CHALLENGE ) At a given temperature the average velocity of the molecules in a sample of oxygen is found to be 1.50*10^2 m/sec. What is the average velocity of the molecules of a sample of fluorine at the same temperature? (Chpt 5)
A: 163 m/sec B: 138 m/sec C: 178 m/sec D: 126 m/sec E: 195 m/sec
14: How many grams of sodium hypochlorite is needed to prepare 324 mL of 0.891 M solution? (4-6,7,8)
A: 205 B: 21.5 C: 24.1 D: 26.1 E: 66.
15: A 1.2 g sample of ethane (C 2 H 6 ) is reacted with 1.1 g of oxygen. What is the maximum amount (theoretical yield) of carbon dioxide which could be formed? (4-4)
A: 1.5 g B: 0.53 g C: 1.8 g D: 0.86 g E: 3.5 g
16: On the diagram below: X = 300 J, "A" represents products, "B" represents reactants.
Mark a if A, B, & C are correct.
b if A & C are correct.
c if B and D are correct.
d if D only is correct.
e otherwise.
Choose the correct statements
regarding the diagram to the right
using K-TYPE answer format: E
n t h a l p y
4X_
3X_
2X_
X_
0_
A
B
A: The reaction diagrammed is exothermic. (6-6) B: The enthalpy change for the reaction to the right is approximately 600 kcal. (6-6) C: The enthalpy of the products is approximately 300 J. (6-6) D: The value of a state function is independent of the path by which a reaction occurs. (6-2)
