Question 1

At what temperature will sulfur hexafluoride molecules have the same average speed as argon atoms at 20°C?

Accepted Answer

A) -22.0°C 
B) 73.2°C 
C) 381°C 
D) 799°C 
A) -22.0°C 
B) 73.2°C 
C) 381°C 
D) 799°C

Question 2

The volume of 350.mL of gas at 25°C is decreased to 135 mL at constant pressure.What is the final temperature of the gas?

Accepted Answer

A) - 158°C 
B) 9)6°C 
C) 65°C 
D) 500°C 
A) - 158°C 
B) 9)6°C 
C) 65°C 
D) 500°C

Question 3

Assume that you have a sample of gas in a cylinder with a moveable piston,as shown in diagram (1).The initial pressure,number of moles,and temperature of the gas are noted on the diagram.Which diagram (2)-(4)most closely represents the result of doubling the number of moles of gas while keeping the pressure and temperature constant?

Accepted Answer

A) diagram (2) 
B) diagram (3) 
C) diagram (4) 
A) diagram (2) 
B) diagram (3) 
C) diagram (4)

Question 4

In the laboratory,hydrogen gas is usually made by the following reaction:
Zn(s)+ 2 HCl(aq)→ H2(g)+ ZnCl2(aq)
How many liters of H2 gas,collected over water at an atmospheric pressure of 752 mm Hg and a temperature of 21.0°C,can be made from 1.566 g of Zn and excess HCl? The partial pressure of water vapor is 18.65 mm Hg at 21.0°C.

Accepted Answer

A) 0)0428 L 
B) 0)573 L 
C) 0)585 L 
D) 0)599 L 
A) 0)0428 L 
B) 0)573 L 
C) 0)585 L 
D) 0)599 L

Question 5

A container filled with gas is connected to an open-end U-tube manometer that is filled with mineral oil.The pressure in the gas container is 773 mm Hg and atmospheric pressure is 754 mm Hg.What will be the difference in the levels of mineral oil in the two arms of the manometer if the densities of Hg and mineral oil are 13.6 g/mL and 0.822 g/mL respectively?

Accepted Answer

A) 1)15 mm 
B) 15.6 mm 
C) 19.0 mm 
D) 314 mm 
A) 1)15 mm 
B) 15.6 mm 
C) 19.0 mm 
D) 314 mm

Question 6

In the upper atmosphere,photochemical reactions involving organic molecules containing the elements ________ and ________ generate products that lead to ozone depletion.

Accepted Answer

chlorine a

Question 7

According to the kinetic molecular theory of gases,at 298 K the average kinetic energy of O2 is ________ the average kinetic energy of CO2.

Accepted Answer

Question 8

When 14.0 g of zinc metal reacts with excess HCl,how many liters of H2 gas are produced at STP?

Accepted Answer

A) 0)2 08 L 
B) 0)416 L 
C) 4)80 L 
D) 9)60 L 
A) 0)2 08 L 
B) 0)416 L 
C) 4)80 L 
D) 9)60 L

Question 9

Gases do not behave ideally under conditions of ________ pressure and ________ temperature.

Accepted Answer

The answer of Gases do not behave ideally under conditions...

Question 10

According to Graham's law,the rate of effusion of a gas is inversely proportional to the ________.

Accepted Answer

square roo

Question 11

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl2,and cylinder C contains N2.According to the kinetic molecular theory,which gas has the highest pressure?

Accepted Answer

A) Ar 
B) Cl2 
C) N2 
D) All have identical pressures 
A) Ar 
B) Cl2 
C) N2 
D) All have identical pressures

Question 12

Effusion of a 1:1 mixture of two gases,represented by unshaded and shaded spheres in the diagram below,through a small pinhole produces the result shown below.The shaded spheres have a molecular mass of 20 amu.Which gas molecules have the higher average speed and what is the molecular mass of the unshaded molecules?

Accepted Answer

A) Unshaded molecules have higher average speed and molecular mass = 14 amu 
B) Unshaded molecules have higher average speed and molecular mass = 17 amu 
C) Unshaded molecules have lower average speed and molecular mass = 24 amu 
D) Unshaded molecules have lower average speed and molecular mass = 29 amu 
A) Unshaded molecules have higher average speed and molecular mass = 14 amu 
B) Unshaded molecules have higher average speed and molecular mass = 17 amu 
C) Unshaded molecules have lower average speed and molecular mass = 24 amu 
D) Unshaded molecules have lower average speed and molecular mass = 29 amu

Question 13

How many grams of O2 gas are there in a 5.00-L cylinder at 4.00 × 103 mm Hg and 23°C?

Accepted Answer

A) 17.3 g 
B) 34.7 g 
C) 446 g 
D) 2)63 × 104 g 
A) 17.3 g 
B) 34.7 g 
C) 446 g 
D) 2)63 × 104 g

Question 14

Which of the following gases has the highest average speed at 400K?

Accepted Answer

A) N2 
B) O2   
C) F2 
D) Cl2 
A) N2 
B) O2   
C) F2 
D) Cl2

Question 15

A lungful of air (500 mL)contains 4.1% CO2 by volume.How many grams of KO2(s)is needed to remove the CO2 from a lungful of air at STP according to the following reaction?
4 KO2(s)+ 2 CO2(g)→ 2 K2CO3(s)+ 3 O2(g)

Accepted Answer

A) 0)065 g 
B) 0)13 g 
C) 0)26 g 
D) 1)2 g 
A) 0)065 g 
B) 0)13 g 
C) 0)26 g 
D) 1)2 g

Question 16

A steel bottle contains argon gas at STP.What is the final pressure if the temperature is changed to 145°C?

Accepted Answer

A) 0)653 atm 
B) 0)713 atm 
C) 1)40 atm 
D) 1)53 atm 
A) 0)653 atm 
B) 0)713 atm 
C) 1)40 atm 
D) 1)53 atm

Question 17

An unknown gas contains 83% C and 17% H by mass.If effuses at 0.87 times the rate of CO2 gas under the same conditions.What is the molecular formula of the unknown gas?

Accepted Answer

A) C2H5 
B) C3H3 
C) C4H10 
D) C7H17 
A) C2H5 
B) C3H3 
C) C4H10 
D) C7H17

Question 18

If one mole of gas occupies 22.4 L at STP the same gas would occupy ________ than 22.4 L at 25°C and 738 mm Hg.

Accepted Answer

The answer of If one mole of gas occupies 22.4...

Question 19

The volume of 350.mL of gas at 25°C is decreased to 125 mL at constant pressure.What is the final temperature of the gas?

Accepted Answer

A) -167°C 
B) 8)9°C 
C) 70°C 
D) 561°C 
A) -167°C 
B) 8)9°C 
C) 70°C 
D) 561°C

Question 20

What is the Celsius temperature of 100.0 g of chlorine gas in a 40.0-L container at 800 mm Hg?

Accepted Answer

A) -91°C 
B) 91°C 
C) 182°C 
D) 364°C 
A) -91°C 
B) 91°C 
C) 182°C 
D) 364°C

At what temperature will sulfur hexafluoride molecules have the same average speed as argon atoms at 20°C?

The volume of 350.mL of gas at 25°C is decreased to 135 mL at constant pressure.What is the final temperature of the gas?

In the upper atmosphere,photochemical reactions involving organic molecules containing the elements and generate products that lead to ozone depletion.

According to the kinetic molecular theory of gases,at 298 K the average kinetic energy of O₂ is ________ the average kinetic energy of CO₂.

When 14.0 g of zinc metal reacts with excess HCl,how many liters of H₂ gas are produced at STP?

Gases do not behave ideally under conditions of pressure and temperature.

According to Graham's law,the rate of effusion of a gas is inversely proportional to the ________.

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl₂,and cylinder C contains N₂.According to the kinetic molecular theory,which gas has the highest pressure?

How many grams of O₂ gas are there in a 5.00-L cylinder at 4.00 × 10³ mm Hg and 23°C?

Which of the following gases has the highest average speed at 400K?

A lungful of air (500 mL)contains 4.1% CO₂ by volume.How many grams of KO₂(s)is needed to remove the CO₂ from a lungful of air at STP according to the following reaction? 4 KO₂(s)+ 2 CO₂(g)→ 2 K₂CO₃(s)+ 3 O₂(g)

A steel bottle contains argon gas at STP.What is the final pressure if the temperature is changed to 145°C?

An unknown gas contains 83% C and 17% H by mass.If effuses at 0.87 times the rate of CO₂ gas under the same conditions.What is the molecular formula of the unknown gas?

If one mole of gas occupies 22.4 L at STP the same gas would occupy ________ than 22.4 L at 25°C and 738 mm Hg.

The volume of 350.mL of gas at 25°C is decreased to 125 mL at constant pressure.What is the final temperature of the gas?

What is the Celsius temperature of 100.0 g of chlorine gas in a 40.0-L container at 800 mm Hg?

Chemistry: Matter and Measurement

Atoms, molecules, and Ions

Formulas, equations, and Moles

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds and Molecular Structure

Thermochemistry: Chemical Energy

Liquids,solids,and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

Organic and Biological Chemistry

Filters

Exam 9: Gases: Their Properties and Behavior

At what temperature will sulfur hexafluoride molecules have the same average speed as argon atoms at 20°C?

The volume of 350.mL of gas at 25°C is decreased to 135 mL at constant pressure.What is the final temperature of the gas?

In the upper atmosphere,photochemical reactions involving organic molecules containing the elements ________ and ________ generate products that lead to ozone depletion.

According to the kinetic molecular theory of gases,at 298 K the average kinetic energy of O2 is ________ the average kinetic energy of CO2.

When 14.0 g of zinc metal reacts with excess HCl,how many liters of H2 gas are produced at STP?

Gases do not behave ideally under conditions of ________ pressure and ________ temperature.

According to Graham's law,the rate of effusion of a gas is inversely proportional to the ________.

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl2,and cylinder C contains N2.According to the kinetic molecular theory,which gas has the highest pressure?

How many grams of O2 gas are there in a 5.00-L cylinder at 4.00 × 103 mm Hg and 23°C?

Which of the following gases has the highest average speed at 400K?

A lungful of air (500 mL)contains 4.1% CO2 by volume.How many grams of KO2(s)is needed to remove the CO2 from a lungful of air at STP according to the following reaction? 4 KO2(s)+ 2 CO2(g)→ 2 K2CO3(s)+ 3 O2(g)

A steel bottle contains argon gas at STP.What is the final pressure if the temperature is changed to 145°C?

An unknown gas contains 83% C and 17% H by mass.If effuses at 0.87 times the rate of CO2 gas under the same conditions.What is the molecular formula of the unknown gas?

If one mole of gas occupies 22.4 L at STP the same gas would occupy ________ than 22.4 L at 25°C and 738 mm Hg.

The volume of 350.mL of gas at 25°C is decreased to 125 mL at constant pressure.What is the final temperature of the gas?

What is the Celsius temperature of 100.0 g of chlorine gas in a 40.0-L container at 800 mm Hg?

Chemistry: Matter and Measurement

Atoms, molecules, and Ions

Formulas, equations, and Moles

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds and Molecular Structure

Thermochemistry: Chemical Energy

Liquids,solids,and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

Organic and Biological Chemistry

Filters

In the upper atmosphere,photochemical reactions involving organic molecules containing the elements and generate products that lead to ozone depletion.

According to the kinetic molecular theory of gases,at 298 K the average kinetic energy of O₂ is ________ the average kinetic energy of CO₂.

When 14.0 g of zinc metal reacts with excess HCl,how many liters of H₂ gas are produced at STP?

Gases do not behave ideally under conditions of pressure and temperature.

Each of three identical 15.0-L gas cylinders contains 7.50 mol of gas at 295 K.Cylinder A contains Ar,cylinder B contains Cl₂,and cylinder C contains N₂.According to the kinetic molecular theory,which gas has the highest pressure?

How many grams of O₂ gas are there in a 5.00-L cylinder at 4.00 × 10³ mm Hg and 23°C?

A lungful of air (500 mL)contains 4.1% CO₂ by volume.How many grams of KO₂(s)is needed to remove the CO₂ from a lungful of air at STP according to the following reaction? 4 KO₂(s)+ 2 CO₂(g)→ 2 K₂CO₃(s)+ 3 O₂(g)

An unknown gas contains 83% C and 17% H by mass.If effuses at 0.87 times the rate of CO₂ gas under the same conditions.What is the molecular formula of the unknown gas?