Question 1

Which of the following is the best approximation of the relative densities of air and water,when both are at room temperature?

Accepted Answer

A) The density of air is about 800 times greater than the density of water. 
B) The density of water is about 800 times greater than the density of air. 
C) The density of air is about 80,000 times greater than the density of water. 
D) The density of water is about 80,000 times greater than the density of air. 
E) The density of air is about 800,000 times grater than the density of water. 
A) The density of air is about 800 times greater than the density of water. 
B) The density of water is about 800 times greater than the density of air. 
C) The density of air is about 80,000 times greater than the density of water. 
D) The density of water is about 80,000 times greater than the density of air. 
E) The density of air is about 800,000 times grater than the density of water.

Question 2

The temperature of a gas is 23°C.What is its temperature in kelvins?

Accepted Answer

A) -250 K (-2.50* 102)K 
B) 296 K 
C) 73 K 
D) 45 K 
E) 23 K 
A) -250 K (-2.50* 102)K 
B) 296 K 
C) 73 K 
D) 45 K 
E) 23 K

Question 3

A gas sample was originally in a 2.50 *102 mL container at 25 °C.The gas was transferred to an evacuated 5.00 * 102 mL container,and the pressure was the same in both containers.What is the temperature of the gas in the larger container?

Accepted Answer

A) 596 °C 
B) 323 °C 
C) 50 °C 
D) 13 °C 
E) -124 °C 
A) 596 °C 
B) 323 °C 
C) 50 °C 
D) 13 °C 
E) -124 °C

Question 4

A scientist builds a "pressure thermometer" by sealing air in a tank.If the pressure inside the tank is 946 mm Hg when it is placed in a boiling water bath at 99 °C,and 749 mm Hg when left on the laboratory bench,what is the temperature in the lab?

Accepted Answer

A) 295 °C 
B) 197 °C 
C) 125 °C 
D) 78 °C 
E) 22 °C 
A) 295 °C 
B) 197 °C 
C) 125 °C 
D) 78 °C 
E) 22 °C

Question 5

Which of the following pressures is equal to 0.80 atm?

Accepted Answer

A) 9.5 * 102 torr 
B) 1.3 bar 
C) 24 in.Hg 
D) 18 psi 
E) 1.0 kPa 
A) 9.5 * 102 torr 
B) 1.3 bar 
C) 24 in.Hg 
D) 18 psi 
E) 1.0 kPa

Question 6

Which of the following is incorrect?

Accepted Answer

A) 1.35 atm = 1.03 *103 mm Hg 
B) 1.12 *105 Pa = 33.1 in.Hg 
C) 536 torr = 53.6 cm Hg 
D) 95.5 kPa = 9.67 *103 atm 
E) 747 mm Hg = 9.96 * 104 Pa 
A) 1.35 atm = 1.03 *103 mm Hg 
B) 1.12 *105 Pa = 33.1 in.Hg 
C) 536 torr = 53.6 cm Hg 
D) 95.5 kPa = 9.67 *103 atm 
E) 747 mm Hg = 9.96 * 104 Pa

Question 7

A bubble of steam rises to the top of a container of boiling water.Which of the following features of the ideal gas model best explains this phenomenon?

Accepted Answer

A) Gases consist of molecular particles moving at any instant in straight lines 
B) Molecules collide with each other and with the container walls without loss of energy 
C) Gas molecules behave as independent particles 
D) Gas molecules are very widely spaced 
E) The actual volume of molecules is negligible compared to the space they occupy 
A) Gases consist of molecular particles moving at any instant in straight lines 
B) Molecules collide with each other and with the container walls without loss of energy 
C) Gas molecules behave as independent particles 
D) Gas molecules are very widely spaced 
E) The actual volume of molecules is negligible compared to the space they occupy

Question 8

A gas is collected in a container of fixed volume at 25 °C.If the gas exerts a pressure of 685 mm Hg at this temperature,what will the temperature of the gas be when the pressure is 7.60 * 102 mm Hg?

Accepted Answer

A) 331 °C 
B) 58 °C 
C) 28 °C 
D) 23 °C 
E) -4 °C 
A) 331 °C 
B) 58 °C 
C) 28 °C 
D) 23 °C 
E) -4 °C

Question 9

Consider the mercury barometer shown below.   What is the equivalent of pressure reading in torr?

Accepted Answer

A) 684 torr 
B) 0.900 torr 
C) 6.75 torr 
D) 46.6 torr 
E) 1444 torr 
A) 684 torr 
B) 0.900 torr 
C) 6.75 torr 
D) 46.6 torr 
E) 1444 torr

Which of the following is the best approximation of the relative densities of air and water,when both are at room temperature?

The temperature of a gas is 23°C.What is its temperature in kelvins?

A gas sample was originally in a 2.50 10² mL container at 25 °C.The gas was transferred to an evacuated 5.00 10² mL container,and the pressure was the same in both containers.What is the temperature of the gas in the larger container?

A scientist builds a "pressure thermometer" by sealing air in a tank.If the pressure inside the tank is 946 mm Hg when it is placed in a boiling water bath at 99 °C,and 749 mm Hg when left on the laboratory bench,what is the temperature in the lab?

Which of the following pressures is equal to 0.80 atm?

Which of the following is incorrect?

A bubble of steam rises to the top of a container of boiling water.Which of the following features of the ideal gas model best explains this phenomenon?

A gas is collected in a container of fixed volume at 25 °C.If the gas exerts a pressure of 685 mm Hg at this temperature,what will the temperature of the gas be when the pressure is 7.60 * 10² mm Hg?

Consider the mercury barometer shown below. What is the equivalent of pressure reading in torr?

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Chemical Nomenclature

Chemical Formula Relationships

Chemical Reactions

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Atomic Theory: the Quantum Model of the Atom

Chemical Bonding

Structure and Shape

The Ideal Gas Law and Its Applications

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Exam 4: Introduction to Gases

Which of the following is the best approximation of the relative densities of air and water,when both are at room temperature?

The temperature of a gas is 23°C.What is its temperature in kelvins?

A gas sample was originally in a 2.50 *102 mL container at 25 °C.The gas was transferred to an evacuated 5.00 * 102 mL container,and the pressure was the same in both containers.What is the temperature of the gas in the larger container?

A scientist builds a "pressure thermometer" by sealing air in a tank.If the pressure inside the tank is 946 mm Hg when it is placed in a boiling water bath at 99 °C,and 749 mm Hg when left on the laboratory bench,what is the temperature in the lab?

Which of the following pressures is equal to 0.80 atm?

Which of the following is incorrect?

A bubble of steam rises to the top of a container of boiling water.Which of the following features of the ideal gas model best explains this phenomenon?

A gas is collected in a container of fixed volume at 25 °C.If the gas exerts a pressure of 685 mm Hg at this temperature,what will the temperature of the gas be when the pressure is 7.60 * 102 mm Hg?

Consider the mercury barometer shown below. What is the equivalent of pressure reading in torr?

Matter and Energy

Measurement and Chemical Calculations

Atomic Theory: the Nuclear Model of the Atom

Chemical Nomenclature

Chemical Formula Relationships

Chemical Reactions

Chemical Change

Quantity Relationships in Chemical Reactions

Atomic Theory: the Quantum Model of the Atom

Chemical Bonding

Structure and Shape

The Ideal Gas Law and Its Applications

Gases, liquids, and Solids

Solutions

Acid-Base Proton-Transferreactions

Chemical Equilibrium

Oxidation-Reduction Redoxreactions

Nuclear Chemistry

Organic Chemistry

Biochemistry

Filters

A gas sample was originally in a 2.50 10² mL container at 25 °C.The gas was transferred to an evacuated 5.00 10² mL container,and the pressure was the same in both containers.What is the temperature of the gas in the larger container?

A gas is collected in a container of fixed volume at 25 °C.If the gas exerts a pressure of 685 mm Hg at this temperature,what will the temperature of the gas be when the pressure is 7.60 * 10² mm Hg?