Question 1

Oxygen molecules are 16 times more massive than hydrogen molecules. At a given temperature, the average molecular kinetic energy of oxygen, compared to hydrogen

Accepted Answer

A)  is greater. 
B)  is less. 
C)  is the same. 
D)  more information is required to answer correctly 
A)  is greater. 
B)  is less. 
C)  is the same. 
D)  more information is required to answer correctly C

Question 2

If the temperature changes by 36°F, then what is the change in temperature in Celsius?

Accepted Answer

A)  40°C 
B)  32°C 
C)  26°C 
D)  20°C 
E)  15°C 
A)  40°C 
B)  32°C 
C)  26°C 
D)  20°C 
E)  15°C D

Question 3

An aluminum rod is 20.0 cm in length, has a diameter of 10.0 mm and is at a temperature of 20°C. The coefficient of linear expansion of aluminum is 23.0 × 10−6/°C. If the temperature changes to 50°C, then the increase in diameter of the aluminum rod is

Accepted Answer

A)  4.0 × 10−3 mm. 
B)  4.9 × 10−3 mm. 
C)  5.6 × 10−3 mm. 
D)  6.0 × 10−3 mm. 
E)  6.9 × 10−3 mm. 
A)  4.0 × 10−3 mm. 
B)  4.9 × 10−3 mm. 
C)  5.6 × 10−3 mm. 
D)  6.0 × 10−3 mm. 
E)  6.9 × 10−3 mm. E

Question 4

An ideal gas is at a temperature of 40°C and a pressure of 2.00 atmospheres. If the diameter of an N2 molecule is 0.300 nm, then what is the mean free path of the N2 molecule in the gas?

Accepted Answer

A)  6.02 × 10-8 m 
B)  5.33 × 10-8 m 
C)  5.00 × 10-8 m 
D)  4.75 × 10-8 m 
E)  4.01 × 10-8 m 
A)  6.02 × 10-8 m 
B)  5.33 × 10-8 m 
C)  5.00 × 10-8 m 
D)  4.75 × 10-8 m 
E)  4.01 × 10-8 m

Question 5

A particular chemical reaction occurs at room temperature (293 K) at half the rate that it does at 300 K. What is the activation energy for this reaction?

Accepted Answer

A)  1.20 × 10−19 J 
B)  1.69 × 10−19 J 
C)  1.17 × 10−19 J 
D)  1.73 × 10−19 J 
A)  1.20 × 10−19 J 
B)  1.69 × 10−19 J 
C)  1.17 × 10−19 J 
D)  1.73 × 10−19 J

Question 6

A sample of an ideal gas has a volume of 0.00100 m3, a pressure of 4.50 atmospheres and 2.00 × 1023 particles. What is the temperature of the gas?

Accepted Answer

A)  154 K 
B)  165 K 
C)  173 K 
D)  186 K 
E)  194 K 
A)  154 K 
B)  165 K 
C)  173 K 
D)  186 K 
E)  194 K

Question 7

The temperature of a room is 300 K. What is the temperature in Fahrenheit?

Accepted Answer

A)  70.1°F 
B)  74.2°F 
C)  78.5°F 
D)  80.3°F 
E)  85.2°F 
A)  70.1°F 
B)  74.2°F 
C)  78.5°F 
D)  80.3°F 
E)  85.2°F

Question 8

What is the mass of exactly 1 million helium atoms? The atomic mass of helium is 4.00 u.

Accepted Answer

A)  6.6 × 10−18 kg 
B)  6.0 × 10−17 kg 
C)  6.6 × 10−21 kg 
D)  6.0 × 10−20 kg 
A)  6.6 × 10−18 kg 
B)  6.0 × 10−17 kg 
C)  6.6 × 10−21 kg 
D)  6.0 × 10−20 kg

Question 9

The diameter of a nitrogen molecule is about 0.29 nm. In a tank of nitrogen at a pressure of 2.5 atm and temperature 273 K, what is the mean free path of a nitrogen molecule?

Accepted Answer

A)  40 nm 
B)  56 nm 
C)  177 nm 
D)  125 nm 
A)  40 nm 
B)  56 nm 
C)  177 nm 
D)  125 nm

Question 10

If the average kinetic energy of a fixed volume of ideal gas increases, what must be true?

Accepted Answer

A)  the density decreases 
B)  the pressure increases while the temperature stays the same 
C)  the temperature increases while the pressure stays the same 
D)  both the pressure and temperature increase 
A)  the density decreases 
B)  the pressure increases while the temperature stays the same 
C)  the temperature increases while the pressure stays the same 
D)  both the pressure and temperature increase

Question 11

Under what conditions do real gasses approximate the behavior of an ideal gas?

Accepted Answer

A)  high temperature and low pressure 
B)  low temperature and low pressure 
C)  low temperature and high pressure 
D)  high temperature and high pressure 
A)  high temperature and low pressure 
B)  low temperature and low pressure 
C)  low temperature and high pressure 
D)  high temperature and high pressure

Question 12

A particular chemical reaction that produces hydrogen gas as a byproduct has an activation energy of 19.2 × 10−20 J. If the reaction produces 0.15 × 10−3 mol H2/hr at room temperature (20°C), what is the rate of production of H2 at 52°C?

Accepted Answer

A)  0.16 × 10−2 mol/hr 
B)  0.24 × 10−3 mol/hr 
C)  0.14 × 10−3 mol/hr 
D)  0.14 × 10−5 mol/hr 
A)  0.16 × 10−2 mol/hr 
B)  0.24 × 10−3 mol/hr 
C)  0.14 × 10−3 mol/hr 
D)  0.14 × 10−5 mol/hr

Question 13

A certain chemical reaction has an activation energy of 0.500 × 10−19 J. What temperature is required for the reaction rate to be double what it is at 20°C?

Accepted Answer

A)  290 K 
B)  310 K 
C)  330 K 
D)  350 K 
E)  360 K 
A)  290 K 
B)  310 K 
C)  330 K 
D)  350 K 
E)  360 K

Question 14

One mole of an ideal gas has a volume of 0.0224 m3 and a pressure of 101.3 × 103 Pa. What is the absolute temperature of the gas?

Accepted Answer

A)  273 K 
B)  325 K 
C)  346 K 
D)  352 K 
E)  376 K 
A)  273 K 
B)  325 K 
C)  346 K 
D)  352 K 
E)  376 K

Question 15

A 100 liter water tank is filled to the brim with water when the temperature is 5.00°C. Water has a coefficient of volume expansion of 207 × 10−6/°C. If the temperature of the water tank is increased to 60.0°C, what is the volume of water that overflows the tank (ignore the expansion of the tank)?

Accepted Answer

A)  1.14 liters 
B)  1.40 liters 
C)  1.75 liters 
D)  2.01 liters 
E)  2.44 liters 
A)  1.14 liters 
B)  1.40 liters 
C)  1.75 liters 
D)  2.01 liters 
E)  2.44 liters

Question 16

An ideal gas composed of a mixture of oxygen and nitrogen is at a pressure of 1.50 atmospheres and a temperature of 25.0°C. What is the molar density?

Accepted Answer

A)  79.3 mol/m3 
B)  61.3 mol/m3 
C)  55.5 mol/m3 
D)  47.6 mol/m3 
E)  40.0 mol/m3 
A)  79.3 mol/m3 
B)  61.3 mol/m3 
C)  55.5 mol/m3 
D)  47.6 mol/m3 
E)  40.0 mol/m3

Question 17

A nitrogen molecule has a diameter of about 0.29 nm. The mean free path of a nitrogen molecule in a tank of dry nitrogen at room temperature (293 K) and standard pressure (1 atm) is about 0.10 µm. A tank containing nitrogen at standard temperature (273 K) and pressure has volume V. If the tank is compressed by means of a piston to 20% of its original volume, what is the mean free path for a nitrogen molecule under the new conditions?

Accepted Answer

A)  0.020 µm 
B)  0.125 µm 
C)  0.080 µm 
D)  0.112 µm 
A)  0.020 µm 
B)  0.125 µm 
C)  0.080 µm 
D)  0.112 µm

Question 18

If the temperature of a room is 62°F, then what is the temperature of the room in Kelvin?

Accepted Answer

A)  289.8 K 
B)  291.7 K 
C)  300.0 K 
D)  307.8 K 
E)  312.0 K 
A)  289.8 K 
B)  291.7 K 
C)  300.0 K 
D)  307.8 K 
E)  312.0 K

Question 19

An ideal gas has a pressure of 2.5 atm, a volume of 1.0 L at a temperature of 30°C. How many molecules are there in the gas?

Accepted Answer

A)  6.1 × 1023 
B)  6.1 × 1022 
C)  2.4 × 1023 
D)  2.3 × 1023 
A)  6.1 × 1023 
B)  6.1 × 1022 
C)  2.4 × 1023 
D)  2.3 × 1023

Question 20

A brass box is in the shape of a cube. The coefficient of linear thermal expansion is 19 × 10−6/°C. If the temperature of the box is increased by 20°C, then what is the fractional change in the volume of the box?

Accepted Answer

A)  0.08% 
B)  0.11% 
C)  0.15% 
D)  0.25% 
E)  0.30% 
A)  0.08% 
B)  0.11% 
C)  0.15% 
D)  0.25% 
E)  0.30%

Exam 13: Temperature and the Ideal Gas

Oxygen molecules are 16 times more massive than hydrogen molecules. At a given temperature, the average molecular kinetic energy of oxygen, compared to hydrogen

If the temperature changes by 36°F, then what is the change in temperature in Celsius?

An aluminum rod is 20.0 cm in length, has a diameter of 10.0 mm and is at a temperature of 20°C. The coefficient of linear expansion of aluminum is 23.0 × 10−6/°C. If the temperature changes to 50°C, then the increase in diameter of the aluminum rod is

An ideal gas is at a temperature of 40°C and a pressure of 2.00 atmospheres. If the diameter of an N2 molecule is 0.300 nm, then what is the mean free path of the N2 molecule in the gas?

A particular chemical reaction occurs at room temperature (293 K) at half the rate that it does at 300 K. What is the activation energy for this reaction?

A sample of an ideal gas has a volume of 0.00100 m3, a pressure of 4.50 atmospheres and 2.00 × 1023 particles. What is the temperature of the gas?

The temperature of a room is 300 K. What is the temperature in Fahrenheit?

What is the mass of exactly 1 million helium atoms? The atomic mass of helium is 4.00 u.

The diameter of a nitrogen molecule is about 0.29 nm. In a tank of nitrogen at a pressure of 2.5 atm and temperature 273 K, what is the mean free path of a nitrogen molecule?

If the average kinetic energy of a fixed volume of ideal gas increases, what must be true?

Under what conditions do real gasses approximate the behavior of an ideal gas?

A particular chemical reaction that produces hydrogen gas as a byproduct has an activation energy of 19.2 × 10−20 J. If the reaction produces 0.15 × 10−3 mol H2/hr at room temperature (20°C), what is the rate of production of H2 at 52°C?

A certain chemical reaction has an activation energy of 0.500 × 10−19 J. What temperature is required for the reaction rate to be double what it is at 20°C?

One mole of an ideal gas has a volume of 0.0224 m3 and a pressure of 101.3 × 103 Pa. What is the absolute temperature of the gas?

An ideal gas composed of a mixture of oxygen and nitrogen is at a pressure of 1.50 atmospheres and a temperature of 25.0°C. What is the molar density?

If the temperature of a room is 62°F, then what is the temperature of the room in Kelvin?

An ideal gas has a pressure of 2.5 atm, a volume of 1.0 L at a temperature of 30°C. How many molecules are there in the gas?

A brass box is in the shape of a cube. The coefficient of linear thermal expansion is 19 × 10−6/°C. If the temperature of the box is increased by 20°C, then what is the fractional change in the volume of the box?

Introduction

Motion Along a Line

Motion in a Plane

Force and Newtons Laws of Motion

Circular Motion

Conservation of Energy

Linear Momentum

Torque and Angular Momentum

Fluids

Elasticity and Oscillations

Waves

Sound

Heat

Thermodynamics

Electric Forces and Fields

Electric Potential

Electric Current and Circuits

Magnetic Forces and Fields

Electromagnetic Induction

Alternating Current

Electromagnetic Waves

Reflection and Refraction of Light

Optical Instruments

Interference and Diffraction

Relativity

Early Quantum Physics and the Photon

Quantum Physics

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An aluminum rod is 20.0 cm in length, has a diameter of 10.0 mm and is at a temperature of 20°C. The coefficient of linear expansion of aluminum is 23.0 × 10⁻⁶/°C. If the temperature changes to 50°C, then the increase in diameter of the aluminum rod is

An ideal gas is at a temperature of 40°C and a pressure of 2.00 atmospheres. If the diameter of an N₂ molecule is 0.300 nm, then what is the mean free path of the N₂ molecule in the gas?

A sample of an ideal gas has a volume of 0.00100 m³, a pressure of 4.50 atmospheres and 2.00 × 10²³ particles. What is the temperature of the gas?

A particular chemical reaction that produces hydrogen gas as a byproduct has an activation energy of 19.2 × 10⁻²⁰J. If the reaction produces 0.15 × 10⁻³ mol H₂/hr at room temperature (20°C), what is the rate of production of H₂ at 52°C?

A certain chemical reaction has an activation energy of 0.500 × 10⁻¹⁹ J. What temperature is required for the reaction rate to be double what it is at 20°C?

One mole of an ideal gas has a volume of 0.0224 m³ and a pressure of 101.3 × 10³ Pa. What is the absolute temperature of the gas?

A brass box is in the shape of a cube. The coefficient of linear thermal expansion is 19 × 10⁻⁶/°C. If the temperature of the box is increased by 20°C, then what is the fractional change in the volume of the box?