Question 1

When stopcock A of the open-end manometer shown below is opened,which drawing best represents the result?

Accepted Answer

A) drawing (1) 
B) drawing (2) 
C) drawing (3) 
D) drawing (4) 
A) drawing (1) 
B) drawing (2) 
C) drawing (3) 
D) drawing (4)

Question 2

Given three cylinders containing O2 gas at the same volume and pressure.Cylinder A is at - 20°C,cylinder B is at - 15°F,cylinder C is at 260 K.Which cylinder contains the largest mass of oxygen?

Accepted Answer

A) cylinder A 
B) cylinder B 
C) cylinder C 
D) All cylinders contain the same mass of O2. 
A) cylinder A 
B) cylinder B 
C) cylinder C 
D) All cylinders contain the same mass of O2.

Question 3

At an atmospheric pressure of 745 mm Hg,what is the pressure of He gas inside a cylinder that is attached to an open-end manometer in which the level of mercury in the open side of the manometer is 25 mm Hg higher than the side that is attached to the gas cylinder?

Accepted Answer

The answer of At an atmospheric pressure of 745 mm...

Question 4

One mole of gas at 25°C in a 1.0-L flask has a ________ pressure than one mole of gas at 25°C in a 5.0-L flask.

Accepted Answer

The answer of One mole of gas at 25°C in...

Question 5

If mercury (density = 13.6 g/cm3)at a height of 745 mm Hg in a mercury barometer is replaced with water (density = 1.00 g/cm3),under the same conditions the height of water will be

Accepted Answer

A) 0)180 ft 
B) 2)44 ft 
C) 33.2 ft 
D) 399 ft 
A) 0)180 ft 
B) 2)44 ft 
C) 33.2 ft 
D) 399 ft

Question 6

-What is the pressure (in mm Hg)of the gas inside the above apparatus if the outside pressure,Patm,is 736 mm Hg and the difference in mercury levels,Δh,is 18 mm Hg?

Accepted Answer

A) 18 mm Hg 
B) 718 mm Hg 
C) 736 mm Hg 
D) 754 mm Hg 
A) 18 mm Hg 
B) 718 mm Hg 
C) 736 mm Hg 
D) 754 mm Hg

Question 7

At STP how many liters of NH3 can be produced from the reaction of 6.00 mol of N2 with 6.00 mol of H2?
N2(g)+ 3 H2(g)→ 2 NH3(g)

Accepted Answer

A) 44.8 L 
B) 89.6 L 
C) 134 L 
D) 269 L 
A) 44.8 L 
B) 89.6 L 
C) 134 L 
D) 269 L

Question 8

In the diagram below,nitrogen molecules are represented by unshaded spheres,oxygen molecules by gray spheres,and chlorine molecules by black spheres.  
-If the total pressure in the container is 900 mm Hg,what is the partial pressure of chlorine?

Accepted Answer

A) 90 mm Hg 
B) 180 mm Hg 
C) 270 mm Hg 
D) 450 mm Hg 
A) 90 mm Hg 
B) 180 mm Hg 
C) 270 mm Hg 
D) 450 mm Hg

Question 9

A container filled with gas is connected to an open-end manometer that is filled with mineral oil.The pressure in the gas container is 753 mm Hg and atmospheric pressure is 724 mm.How high will the level rise in 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)75 mm 
B) 23.8 mm 
C) 29.0 mm 
D) 480 mm 
A) 1)75 mm 
B) 23.8 mm 
C) 29.0 mm 
D) 480 mm

Question 10

Which of the following regions of the earth's atmosphere is farthest from the surface of the earth?

Accepted Answer

A) mesosphere 
B) stratosphere 
C) thermosphere 
D) troposphere 
A) mesosphere 
B) stratosphere 
C) thermosphere 
D) troposphere

Question 11

Which one of the following gases will have the lowest rate of effusion?

Accepted Answer

A) SF4 
B) SCl4 
C) S2O5 
D) SO3 
A) SF4 
B) SCl4 
C) S2O5 
D) SO3

Question 12

A process by which gas molecules escape through a tiny hole in a membrane into a vacuum without collisions is called

Accepted Answer

A) Boyle's law. 
B) diffusion. 
C) effusion. 
D) sublimation. 
A) Boyle's law. 
B) diffusion. 
C) effusion. 
D) sublimation.

Question 13

The ozone molecules in the stratosphere absorb much of the ultraviolet radiation from the sun,protecting life on Earth.At a certain altitude,the temperature of the stratosphere is 240 K and the partial pressure of ozone is 1.4 × 10-7 atm.Calculate the number of ozone molecules present in 1.00 L of atmosphere at that altitude.

Accepted Answer

A) 2)1 × 1015 molecules of O3 
B) 4)3 × 1015 molecules of O3 
C) 8)0 × 1031 molecules of O3 
D) 1)8 × 1032 molecules of O3 
A) 2)1 × 1015 molecules of O3 
B) 4)3 × 1015 molecules of O3 
C) 8)0 × 1031 molecules of O3 
D) 1)8 × 1032 molecules of O3

Question 14

How many grams of XeF6 are required to react with 0.579 L of hydrogen gas at 2.46 atm and 45°C in the reaction shown below?
XeF6(s)+ 3 H2(g)→ Xe(g)+ 6 HF(g)

Accepted Answer

A) 3)65 g 
B) 4)46 g 
C) 13.4 g 
D) 40.2 g 
A) 3)65 g 
B) 4)46 g 
C) 13.4 g 
D) 40.2 g

Question 15

The action of some commercial drain cleaners is based on the following reaction:
2 NaOH(s)+ 2 Al(s)+ 6 H2O(l)→ 2 NaAl(OH)4(s)+ 3 H2(g)
What is the volume of H2 gas formed at STP when 4.32 g of Al reacts with excess NaOH?

Accepted Answer

A) 2)39 L 
B) 3)59 L 
C) 5)38 L 
D) 5)87 L 
A) 2)39 L 
B) 3)59 L 
C) 5)38 L 
D) 5)87 L

Question 16

In an open end manometer,one end of a U-tube filled with mercury is attached to a gas-filled container and the other end is open to the atmosphere.If the gas pressure in the container is less than atmospheric pressure

Accepted Answer

A) Hg will be forced out of the open end of the U-tube. 
B) the difference between the Hg levels in the two arms will be greater than 76 cm. 
C) the Hg level will be higher in the arm connected to the container. 
D) the Hg level will be higher in the arm open to the atmosphere. 
A) Hg will be forced out of the open end of the U-tube. 
B) the difference between the Hg levels in the two arms will be greater than 76 cm. 
C) the Hg level will be higher in the arm connected to the container. 
D) the Hg level will be higher in the arm open to the atmosphere.

Question 17

A gas occupies 22.4 L at STP and 14.5 L at 100°C and 2.00 atm pressure.How many moles of gas did the system gain or lose?

Accepted Answer

A) 0)06 moles gained 
B) 0)03 moles gained 
C) 0)03 moles lost 
D) 0)05 moles lost 
A) 0)06 moles gained 
B) 0)03 moles gained 
C) 0)03 moles lost 
D) 0)05 moles lost

Question 18

If NO  and NH3 are allowed to effuse through a porous membrane under identical conditions,the rate of effusion for NH3 will be ________ times that of NO .

Accepted Answer

A) 0)57 
B) 0)75 
C) 1)3 
D) 1)8 
A) 0)57 
B) 0)75 
C) 1)3 
D) 1)8

Question 19

Which is the smallest quantity of pressure?

Accepted Answer

A) 1 atm 
B) 1 centimeter of Hg 
C) 1 mm Hg 
D) 1 pascal 
A) 1 atm 
B) 1 centimeter of Hg 
C) 1 mm Hg 
D) 1 pascal

Question 20

Chloroform is a volatile liquid once commonly used in the laboratory but now being phased out due to its ozone depletion potential.If the pressure of gaseous chloroform in a flask is 195 mm Hg at 25°C and its density is 1.25 g/L,what is the molar mass of chloroform?

Accepted Answer

A) 10.0 g/mol 
B) 76.3 g/mol 
C) 119 g/mol 
D) None of these 
A) 10.0 g/mol 
B) 76.3 g/mol 
C) 119 g/mol 
D) None of these

Exam 9: Gases: Their Properties and Behavior

When stopcock A of the open-end manometer shown below is opened,which drawing best represents the result?

Given three cylinders containing O2 gas at the same volume and pressure.Cylinder A is at - 20°C,cylinder B is at - 15°F,cylinder C is at 260 K.Which cylinder contains the largest mass of oxygen?

At an atmospheric pressure of 745 mm Hg,what is the pressure of He gas inside a cylinder that is attached to an open-end manometer in which the level of mercury in the open side of the manometer is 25 mm Hg higher than the side that is attached to the gas cylinder?

One mole of gas at 25°C in a 1.0-L flask has a ________ pressure than one mole of gas at 25°C in a 5.0-L flask.

If mercury (density = 13.6 g/cm3)at a height of 745 mm Hg in a mercury barometer is replaced with water (density = 1.00 g/cm3),under the same conditions the height of water will be

-What is the pressure (in mm Hg)of the gas inside the above apparatus if the outside pressure,Patm,is 736 mm Hg and the difference in mercury levels,Δh,is 18 mm Hg?

At STP how many liters of NH3 can be produced from the reaction of 6.00 mol of N2 with 6.00 mol of H2? N2(g)+ 3 H2(g)→ 2 NH3(g)

In the diagram below,nitrogen molecules are represented by unshaded spheres,oxygen molecules by gray spheres,and chlorine molecules by black spheres. -If the total pressure in the container is 900 mm Hg,what is the partial pressure of chlorine?

Which of the following regions of the earth's atmosphere is farthest from the surface of the earth?

Which one of the following gases will have the lowest rate of effusion?

A process by which gas molecules escape through a tiny hole in a membrane into a vacuum without collisions is called

How many grams of XeF6 are required to react with 0.579 L of hydrogen gas at 2.46 atm and 45°C in the reaction shown below? XeF6(s)+ 3 H2(g)→ Xe(g)+ 6 HF(g)

The action of some commercial drain cleaners is based on the following reaction: 2 NaOH(s)+ 2 Al(s)+ 6 H2O(l)→ 2 NaAl(OH)4(s)+ 3 H2(g) What is the volume of H2 gas formed at STP when 4.32 g of Al reacts with excess NaOH?

In an open end manometer,one end of a U-tube filled with mercury is attached to a gas-filled container and the other end is open to the atmosphere.If the gas pressure in the container is less than atmospheric pressure

A gas occupies 22.4 L at STP and 14.5 L at 100°C and 2.00 atm pressure.How many moles of gas did the system gain or lose?

If NO and NH3 are allowed to effuse through a porous membrane under identical conditions,the rate of effusion for NH3 will be ________ times that of NO .

Which is the smallest quantity of pressure?

Chloroform is a volatile liquid once commonly used in the laboratory but now being phased out due to its ozone depletion potential.If the pressure of gaseous chloroform in a flask is 195 mm Hg at 25°C and its density is 1.25 g/L,what is the molar mass of chloroform?

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

Given three cylinders containing O₂ gas at the same volume and pressure.Cylinder A is at - 20°C,cylinder B is at - 15°F,cylinder C is at 260 K.Which cylinder contains the largest mass of oxygen?

If mercury (density = 13.6 g/cm³)at a height of 745 mm Hg in a mercury barometer is replaced with water (density = 1.00 g/cm³),under the same conditions the height of water will be

-What is the pressure (in mm Hg)of the gas inside the above apparatus if the outside pressure,P_atm,is 736 mm Hg and the difference in mercury levels,Δh,is 18 mm Hg?

At STP how many liters of NH₃ can be produced from the reaction of 6.00 mol of N₂ with 6.00 mol of H₂? N₂(g)+ 3 H₂(g)→ 2 NH₃(g)

How many grams of XeF₆ are required to react with 0.579 L of hydrogen gas at 2.46 atm and 45°C in the reaction shown below? XeF₆(s)+ 3 H₂(g)→ Xe(g)+ 6 HF(g)

The action of some commercial drain cleaners is based on the following reaction: 2 NaOH(s)+ 2 Al(s)+ 6 H₂O(l)→ 2 NaAl(OH)₄(s)+ 3 H₂(g) What is the volume of H₂ gas formed at STP when 4.32 g of Al reacts with excess NaOH?

If NO and NH₃ are allowed to effuse through a porous membrane under identical conditions,the rate of effusion for NH₃ will be ________ times that of NO.