A ballerina weighs 103 lbs and is up on her toes with only 10.0 cm2 of her slippers in contact with the floor. What pressure is she exerting on the floor?

A) 4.59 × 10 5 Pa B) 4.59 × 10 3 Pa C) 4.59 × 10 1 Pa D) 4.59 × 10 −1 Pa E) 4.59 × 10 −3 Pa A) 4.59 × 10 5 Pa B) 4.59 × 10 3 Pa C) 4.59 × 10 1 Pa D) 4.59 × 10 −1 Pa E) 4.59 × 10 −3 Pa

At moderate pressures (~ 200 atm), the measured pressure exerted by CO2 gas is less than that predicted by the ideal gas equation. This is mainly because

A) such high pressures cannot be accurately measured. B) CO 2 will condense to a liquid at 200 atm pressure. C) gas phase collisions prevent CO 2 molecules from colliding with the walls of the container. D) of attractive intermolecular forces between CO 2 molecules. E) the volume occupied by the CO 2 molecules themselves becomes significant. A) such high pressures cannot be accurately measured. B) CO 2 will condense to a liquid at 200 atm pressure. C) gas phase collisions prevent CO 2 molecules from colliding with the walls of the container. D) of attractive intermolecular forces between CO 2 molecules. E) the volume occupied by the CO 2 molecules themselves becomes significant.

Exam 5: Gases and the Kinetic-Molecular Theory

Helium gas is being pumped into a rigid container at a constant temperature. As a result, the pressure of helium in the container is increasing. Select the one correct statement below.

(Multiple Choice)

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Question 41

Mineral oil can be used in place of mercury in manometers when small pressure changes are to be measured. What is the pressure of an oxygen sample in mm of mineral oil if its pressure is 28.5 mm Hg? (d of mineral oil = 0.88 g/mL; d of Hg = 13.5 g/mL)

(Multiple Choice)

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Question 42

For a pure gas sample, the average kinetic energy is also the most probable kinetic energy.

(True/False)

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Question 43

The rate of diffusion of a gas is inversely proportional to its molar mass.

(True/False)

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Question 44

The ozone layer is important because

(Multiple Choice)

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Question 45

Hydrochloric acid is prepared by bubbling hydrogen chloride gas through water. What is the concentration of a solution prepared by dissolving 225 L of HCl(g) at 37°C and 89.6 kPa in 5.25 L of water?

(Multiple Choice)

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Question 46

According to the postulates of kinetic-molecular theory, the average kinetic energy of gas molecules is proportional to the absolute temperature.

(True/False)

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Question 47

"The rate of effusion of a gas is inversely proportional to the square root of its molar mass" is a statement of __________ Law.

(Multiple Choice)

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Question 48

A 0.850-mole sample of nitrous oxide, a gas used as an anesthetic by dentists, has a volume of 20.46 L at 123°C and 1.35 atm. What would be its volume at 468°C and 1.35 atm?

(Multiple Choice)

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Question 49

Small quantities of hydrogen can be prepared by the addition of hydrochloric acid to zinc. A sample of 195 mL of hydrogen was collected over water at 25°C and 753 torr. What mass of hydrogen was collected? (P_water = 24 torr at 25°C)

(Multiple Choice)

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Question 50

Which of the following gases effuses most rapidly?

(Multiple Choice)

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Question 51

A sample of nitrogen gas at 298 K and 745 torr has a volume of 37.42 L. What volume will it occupy if the pressure is increased to 894 torr at constant temperature?

(Multiple Choice)

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Question 52

Calculate the pressure of a helium sample at −207.3°C and 768 mL if it exerts a pressure of 175 kPa at 25.0°C and 925 mL.

(Multiple Choice)

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Question 53

A gas consists of 85.7 percent carbon and 14.3 percent hydrogen, by weight. A sample of this gas weighing 0.673 g occupies 729 mL at a pressure of 720.0 mmHg and a temperature of 77°C. Calculate its empirical and molecular formulas.

(Multiple Choice)

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Question 54

The temperature of the carbon dioxide atmosphere near the surface of Venus is 475°C. Calculate the average kinetic energy per mole of carbon dioxide molecules on Venus.

(Multiple Choice)

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Question 55

According to the kinetic theory of gases, in a collision between two molecules the kinetic energy of one molecule will decrease by the same amount that the kinetic energy of the other one increases.

(True/False)

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Question 56

A ballerina weighs 103 lbs and is up on her toes with only 10.0 cm² of her slippers in contact with the floor. What pressure is she exerting on the floor?

(Multiple Choice)

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Question 57

"The pressure of an ideal gas is directly proportional to its absolute temperature at constant volume and number of moles" is a statement of __________ Law.

(Multiple Choice)

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Question 58

At moderate pressures (~ 200 atm), the measured pressure exerted by CO₂ gas is less than that predicted by the ideal gas equation. This is mainly because

(Multiple Choice)

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Question 59

At very high pressures (~ 1000 atm), the measured pressure exerted by real gases is greater than that predicted by the ideal gas equation. This is mainly because

(Multiple Choice)

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Question 60

Showing 41 - 60 of 98

Exam 5: Gases and the Kinetic-Molecular Theory

Helium gas is being pumped into a rigid container at a constant temperature. As a result, the pressure of helium in the container is increasing. Select the one correct statement below.

Mineral oil can be used in place of mercury in manometers when small pressure changes are to be measured. What is the pressure of an oxygen sample in mm of mineral oil if its pressure is 28.5 mm Hg? (d of mineral oil = 0.88 g/mL; d of Hg = 13.5 g/mL)

For a pure gas sample, the average kinetic energy is also the most probable kinetic energy.

The rate of diffusion of a gas is inversely proportional to its molar mass.

The ozone layer is important because

Hydrochloric acid is prepared by bubbling hydrogen chloride gas through water. What is the concentration of a solution prepared by dissolving 225 L of HCl(g) at 37°C and 89.6 kPa in 5.25 L of water?

According to the postulates of kinetic-molecular theory, the average kinetic energy of gas molecules is proportional to the absolute temperature.

"The rate of effusion of a gas is inversely proportional to the square root of its molar mass" is a statement of __________ Law.

A 0.850-mole sample of nitrous oxide, a gas used as an anesthetic by dentists, has a volume of 20.46 L at 123°C and 1.35 atm. What would be its volume at 468°C and 1.35 atm?

Small quantities of hydrogen can be prepared by the addition of hydrochloric acid to zinc. A sample of 195 mL of hydrogen was collected over water at 25°C and 753 torr. What mass of hydrogen was collected? (Pwater = 24 torr at 25°C)

Which of the following gases effuses most rapidly?

A sample of nitrogen gas at 298 K and 745 torr has a volume of 37.42 L. What volume will it occupy if the pressure is increased to 894 torr at constant temperature?

Calculate the pressure of a helium sample at −207.3°C and 768 mL if it exerts a pressure of 175 kPa at 25.0°C and 925 mL.

A gas consists of 85.7 percent carbon and 14.3 percent hydrogen, by weight. A sample of this gas weighing 0.673 g occupies 729 mL at a pressure of 720.0 mmHg and a temperature of 77°C. Calculate its empirical and molecular formulas.

The temperature of the carbon dioxide atmosphere near the surface of Venus is 475°C. Calculate the average kinetic energy per mole of carbon dioxide molecules on Venus.

According to the kinetic theory of gases, in a collision between two molecules the kinetic energy of one molecule will decrease by the same amount that the kinetic energy of the other one increases.

A ballerina weighs 103 lbs and is up on her toes with only 10.0 cm2 of her slippers in contact with the floor. What pressure is she exerting on the floor?

"The pressure of an ideal gas is directly proportional to its absolute temperature at constant volume and number of moles" is a statement of __________ Law.

At moderate pressures (~ 200 atm), the measured pressure exerted by CO2 gas is less than that predicted by the ideal gas equation. This is mainly because

At very high pressures (~ 1000 atm), the measured pressure exerted by real gases is greater than that predicted by the ideal gas equation. This is mainly because

Keys to the Study of Chemistry: Definitions, Units, and Problem Solving

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and Reaction Direction

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

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Small quantities of hydrogen can be prepared by the addition of hydrochloric acid to zinc. A sample of 195 mL of hydrogen was collected over water at 25°C and 753 torr. What mass of hydrogen was collected? (P_water = 24 torr at 25°C)

A ballerina weighs 103 lbs and is up on her toes with only 10.0 cm² of her slippers in contact with the floor. What pressure is she exerting on the floor?

At moderate pressures (~ 200 atm), the measured pressure exerted by CO₂ gas is less than that predicted by the ideal gas equation. This is mainly because