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| 1 | |
Which of the following statements about gases is not correct? |
| | A) | They have much lower densities than solids or liquids. |
| | B) | They form homogenous mixtures regardless of the nature of gases. |
| | C) | They have strong intermolecular forces. |
| | D) | They have high compressibility. |
| | E) | They do not possess a shape of their own. |
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| 2 | |
If a certain pressure supports a 256 mm high column of mercury, how high a column of water would it support? The density of mercury is 13.6 g/cm3. |
| | A) | 0.741 in |
| | B) | 10.1 in |
| | C) | 29.0 in |
| | D) | 11.4 ft |
| | E) | 32.9 ft |
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| 3 | |
Convert a gas pressure of 485 cmHg to atmospheres. |
| | A) | 0.64 atm |
| | B) | 33.0 atm |
| | C) | 6.38 atm |
| | D) | 5.50 atm |
| | E) | 6.46 atm |
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| 4 | |
"The volume of an ideal gas is directly proportional to the number of moles of the gas at constant temperature and pressure" is a statement of _____________ Law. |
| | A) | Charles' |
| | B) | Boyle's |
| | C) | Amontons's |
| | D) | Avogadro's |
| | E) | Dalton's |
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| 5 | |
A steel tank contains carbon dioxide at 34°C and is at a pressure of 13.0 atm. Determine the internal gas pressure when the tank and its contents are heated to 100°C. |
| | A) | 10.7 atm |
| | B) | 9.4 atm |
| | C) | 38.2 atm |
| | D) | 1.9 atm |
| | E) | 15.8 atm |
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| 6 | |
Calculate the pressure of 0.55 mol of NH3 gas in a 2.00 L vessel at 25°C, using the ideal gas law. |
| | A) | 2.5 atm |
| | B) | 6.7 atm |
| | C) | 0.6 atm |
| | D) | 7.5 atm |
| | E) | 3.4 atm |
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| 7 | |
How many grams of CO2 are contained in 550 mL of the gas at STP? |
| | A) | 1.08 g |
| | B) | 0.28 g |
| | C) | 1080 g |
| | D) | 0.56 g |
| | E) | 0.125 g |
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| 8 | |
Calculate the density of chlorine gas in g/L, at STP. |
| | A) | 0.32 g/L |
| | B) | 0.63 g/L |
| | C) | 1.6 g/L |
| | D) | 2.9 g/L |
| | E) | 3.2 g/L |
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| 9 | |
A 1.325 g sample of an unknown vapor occupies 368 mL at 114°C and 946 mmHg. The simplest formula of the compound is NO2. What is the molecular formula of the compound? |
| | A) | NO2 |
| | B) | N4O8 |
| | C) | N3O6 |
| | D) | N2O4 |
| | E) | N6O12 |
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| 10 | |
A sample of hydrogen gas was collected over water at 36°C and 855 mmHg. The volume of the container was 6.50 L. Calculate the number of moles of H2 collected. (Vapor pressure of water is
44.6 torr at 36°C) |
| | A) | 0.29 mol |
| | B) | 4.69 mol |
| | C) | 0.27 mol |
| | D) | 2.35 mol |
| | E) | 0.14 mol |
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| 11 | |
The "air bags" that are currently installed in automobiles to prevent injuries in the event of a crash are equipped with sodium azide, NaN3, which decomposes when activated by an electronic igniter to produce nitrogen gas that fills the bag. How many liters of nitrogen, measured at 25°C and 1.00 atm, will be produced by 100.0 g of NaN3?
Equation: 2NaN3(s) → 2Na(s) + 3N2(s) |
| | A) | 1.33 L |
| | B) | 15.9 L |
| | C) | 37.6 L |
| | D) | 56.4 L |
| | E) | 205 L |
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| 12 | |
If the volume of a sample of gas is reduced at constant temperature, the average velocity of the molecules _______, the average force of an individual collision _________, and the average number of collisions with the wall, per unit area, per second _______. |
| | A) | remains the same, increases, increases |
| | B) | remains the same, remains the same, increases |
| | C) | remains the same, decreases, remains the same |
| | D) | decreases, increases, increases |
| | E) | increases, increases, increases |
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| 13 | |
In an effusion experiment it required 40 s for a certain number of moles of a gas of unknown molar mass to pass through a small orifice into a vacuum. Under the same conditions 16 s were required for the same number of moles of O2 to effuse. What is the molar mass of the unknown gas? |
| | A) | 5.1 g/mol |
| | B) | 12.8 g/mol |
| | C) | 80 g/mol |
| | D) | 100 g/mol |
| | E) | 200 g/mol |
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| 14 | |
Comparing helium atoms with nitrogen molecules at the same temperature, the helium atoms on average are moving _______ and have _______ kinetic energy. |
| | A) | faster, greater |
| | B) | faster, less |
| | C) | slower, greater |
| | D) | slower, less |
| | E) | faster, the same |
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| 15 | |
Deviations from the ideal gas law are less at: |
| | A) | high temperatures and high pressures |
| | B) | high temperatures and low pressures |
| | C) | low temperatures and high pressures |
| | D) | low temperatures and low pressures |
| | E) | high volumes and low temperatures |
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