Question 1

At STP how many grams of Mg are required to produce 35 mL of H2 in the reaction shown below?
Mg(s)+ 2 HCl(aq)→ H2(g)+ MgCl2(aq)

Accepted Answer

A) 0)035 g 
B) 0)038 g 
C) 26 g 
D) 29 g 
A) 0)035 g 
B) 0)038 g 
C) 26 g 
D) 29 g

Question 2

If the pressure in a gas container that is connected to an open-end U-tube manometer is 116 kPa and the pressure of the atmosphere at the open end of the tube is 752 mm Hg,the level of mercury in the tube will

Accepted Answer

A) be 118 mm higher in the arm open to the atmosphere. 
B) be 118 mm higher in the arm connected to the gas cylinder. 
C) be 870 mm higher in the arm open to the atmosphere. 
D) be 870 mm higher in the arm connected to the gas cylinder. 
A) be 118 mm higher in the arm open to the atmosphere. 
B) be 118 mm higher in the arm connected to the gas cylinder. 
C) be 870 mm higher in the arm open to the atmosphere. 
D) be 870 mm higher in the arm connected to the gas cylinder.

Question 3

What is the total pressure in a 6.00-L flask which contains 0.127 mol of H2(g)and 0.288 mol of N2(g)at 20.0°C?

Accepted Answer

A) 0)510 atm 
B) 0)681 atm 
C) 1)16 atm 
D) 1)66 atm 
A) 0)510 atm 
B) 0)681 atm 
C) 1)16 atm 
D) 1)66 atm

Question 4

Pressure is defined as

Accepted Answer

A) force divided by unit area. 
B) force times unit area. 
C) mass divided by acceleration. 
D) mass times acceleration. 
A) force divided by unit area. 
B) force times unit area. 
C) mass divided by acceleration. 
D) mass times acceleration.

Question 5

According to the kinetic molecular theory of gases,the volume of the gas particles (atoms or molecules)is ________ compared to the volume of the container in which the gas particles are held.

Accepted Answer

The answer of According to the kinetic molecular theory of...

Question 6

How many grams of NO gas are there in a 5.00-L cylinder at 4.00 × 103 mm Hg and 23°C?

Accepted Answer

A) 13.9 g 
B) 32.1 g 
C) 417 g 
D) 2)47 × 104 g 
A) 13.9 g 
B) 32.1 g 
C) 417 g 
D) 2)47 × 104 g

Question 7

An unknown gas effuses 2.3 times faster than N2O4 at the same temperature.What is the identity of the unknown gas?

Accepted Answer

A) CN2 
B) NH3 
C) N2O 
D) O3 
A) CN2 
B) NH3 
C) N2O 
D) O3

Question 8

If 0.40 mol of NaN3 reacts completely in the reaction shown below,then ________ L of N2 will be produced at STP.
2 NaN3(s)→ 2 Na(s)+ 3 N2(g)

Accepted Answer

Question 9

In the diagram below,helium atoms are represented by unshaded spheres,neon atoms by gray spheres,and argon atoms by black spheres.  
-If the total pressure in the container is 900 mm Hg,what is the partial pressure of helium?

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 10

Which of the following equations represents "Boyle's law"?

Accepted Answer

A)    = k 
B)    = k 
C) PV = k 
D) V = nk 
A)    = k 
B)    = k 
C) PV = k 
D) V = nk

Question 11

An unknown gas effuses 1.73 times faster than krypton.What is the molar mass of the gas?

Accepted Answer

A) 28.0 g/mol 
B) 48.4 g/mol 
C) 110 g/mol 
D) 251 g/mol 
A) 28.0 g/mol 
B) 48.4 g/mol 
C) 110 g/mol 
D) 251 g/mol

Question 12

What is the volume of 30.0 g of argon gas at 157°C and 2.50 kPa pressure?

Accepted Answer

A) 3)87 L 
B) 10.6 L 
C) 393 L 
D) 1070 L 
A) 3)87 L 
B) 10.6 L 
C) 393 L 
D) 1070 L

Question 13

A gas bottle contains 0.650 mol of gas at 730 mm Hg pressure.If the final pressure is 1.15 atm,how many moles of gas were added to the bottle?

Accepted Answer

A) 0)0680 mol 
B) 0)128 mol 
C) 0)717 mol 
D) 0)778 mol 
A) 0)0680 mol 
B) 0)128 mol 
C) 0)717 mol 
D) 0)778 mol

Question 14

If the number of moles of gas is doubled at constant temperature and volume,the pressure of the gas

Accepted Answer

A) is halved. 
B) is doubled. 
C) is quadrupled. 
D) remains the same. 
A) is halved. 
B) is doubled. 
C) is quadrupled. 
D) remains the same.

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 6.32 g of Al reacts with excess NaOH?

Accepted Answer

A) 3)50 L 
B) 5)25 L 
C) 7)87 L 
D) 8)59 L 
A) 3)50 L 
B) 5)25 L 
C) 7)87 L 
D) 8)59 L

Question 16

A glass tube has one end in a dish of mercury and the other end closed by a stopcock.The distance from the surface of the mercury to the bottom of the stopcock is 800 mm,as indicated by the meter stick shown in the drawing below.The apparatus is at 20°C,and the mercury level in the tube is the same as that in the dish.  
-Which drawing best shows the approximate level of the mercury in the tube when the temperature of the entire apparatus is lowered from +20°C to -20°C?

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 17

A glass tube has one end in a dish of mercury and the other end closed by a stopcock.The distance from the surface of the mercury to the bottom of the stopcock is 800 mm,as indicated by the meter stick shown in the drawing below.The apparatus is at 20°C,and the mercury level in the tube is the same as that in the dish.  
-Which drawing best shows the approximate level of the mercury in the tube when a vacuum pump is connected to the top of the tube,the stopcock opened,the tube is evacuated,the stopcock is closed,and the pump is removed,and the stopcock is reopened?

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 18

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 temperature while keeping the pressure and number of moles of gas constant?

Accepted Answer

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

Question 19

What is the average speed (actually the root-mean-square speed)of a neon atom at 27°C?

Accepted Answer

A) 5)78 m/s 
B) 19.3 m/s 
C) 183 m/s 
D) 609 m/s 
A) 5)78 m/s 
B) 19.3 m/s 
C) 183 m/s 
D) 609 m/s

Question 20

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 average kinetic energy?

Accepted Answer

A) Ar 
B) Cl2 
C) N2 
D) All have identical average kinetic energies 
A) Ar 
B) Cl2 
C) N2 
D) All have identical average kinetic energies

At STP how many grams of Mg are required to produce 35 mL of H₂ in the reaction shown below? Mg(s)+ 2 HCl(aq)→ H₂(g)+ MgCl₂(aq)

If the pressure in a gas container that is connected to an open-end U-tube manometer is 116 kPa and the pressure of the atmosphere at the open end of the tube is 752 mm Hg,the level of mercury in the tube will

What is the total pressure in a 6.00-L flask which contains 0.127 mol of H₂(g)and 0.288 mol of N₂(g)at 20.0°C?

Pressure is defined as

According to the kinetic molecular theory of gases,the volume of the gas particles (atoms or molecules)is ________ compared to the volume of the container in which the gas particles are held.

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

An unknown gas effuses 2.3 times faster than N₂O₄ at the same temperature.What is the identity of the unknown gas?

If 0.40 mol of NaN₃reacts completely in the reaction shown below,then ________ L of N₂ will be produced at STP. 2 NaN₃(s)→ 2 Na(s)+ 3 N₂(g)

In the diagram below,helium atoms are represented by unshaded spheres,neon atoms by gray spheres,and argon atoms by black spheres. -If the total pressure in the container is 900 mm Hg,what is the partial pressure of helium?

Which of the following equations represents "Boyle's law"?

An unknown gas effuses 1.73 times faster than krypton.What is the molar mass of the gas?

What is the volume of 30.0 g of argon gas at 157°C and 2.50 kPa pressure?

A gas bottle contains 0.650 mol of gas at 730 mm Hg pressure.If the final pressure is 1.15 atm,how many moles of gas were added to the bottle?

If the number of moles of gas is doubled at constant temperature and volume,the pressure of the gas

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 6.32 g of Al reacts with excess NaOH?

What is the average speed (actually the root-mean-square speed)of a neon atom at 27°C?

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 average kinetic energy?

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 STP how many grams of Mg are required to produce 35 mL of H2 in the reaction shown below? Mg(s)+ 2 HCl(aq)→ H2(g)+ MgCl2(aq)

If the pressure in a gas container that is connected to an open-end U-tube manometer is 116 kPa and the pressure of the atmosphere at the open end of the tube is 752 mm Hg,the level of mercury in the tube will

What is the total pressure in a 6.00-L flask which contains 0.127 mol of H2(g)and 0.288 mol of N2(g)at 20.0°C?

Pressure is defined as

According to the kinetic molecular theory of gases,the volume of the gas particles (atoms or molecules)is ________ compared to the volume of the container in which the gas particles are held.

How many grams of NO gas are there in a 5.00-L cylinder at 4.00 × 103 mm Hg and 23°C?

An unknown gas effuses 2.3 times faster than N2O4 at the same temperature.What is the identity of the unknown gas?

If 0.40 mol of NaN3 reacts completely in the reaction shown below,then ________ L of N2 will be produced at STP. 2 NaN3(s)→ 2 Na(s)+ 3 N2(g)

In the diagram below,helium atoms are represented by unshaded spheres,neon atoms by gray spheres,and argon atoms by black spheres. -If the total pressure in the container is 900 mm Hg,what is the partial pressure of helium?

Which of the following equations represents "Boyle's law"?

An unknown gas effuses 1.73 times faster than krypton.What is the molar mass of the gas?

What is the volume of 30.0 g of argon gas at 157°C and 2.50 kPa pressure?

A gas bottle contains 0.650 mol of gas at 730 mm Hg pressure.If the final pressure is 1.15 atm,how many moles of gas were added to the bottle?

If the number of moles of gas is doubled at constant temperature and volume,the pressure of the gas

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 6.32 g of Al reacts with excess NaOH?

What is the average speed (actually the root-mean-square speed)of a neon atom at 27°C?

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 average kinetic energy?

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

At STP how many grams of Mg are required to produce 35 mL of H₂ in the reaction shown below? Mg(s)+ 2 HCl(aq)→ H₂(g)+ MgCl₂(aq)

What is the total pressure in a 6.00-L flask which contains 0.127 mol of H₂(g)and 0.288 mol of N₂(g)at 20.0°C?

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

An unknown gas effuses 2.3 times faster than N₂O₄ at the same temperature.What is the identity of the unknown gas?

If 0.40 mol of NaN₃reacts completely in the reaction shown below,then ________ L of N₂ will be produced at STP. 2 NaN₃(s)→ 2 Na(s)+ 3 N₂(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 6.32 g of Al reacts with excess NaOH?

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 average kinetic energy?