Question 1

Which one of these gases is "lighter-than-air"?

Accepted Answer

A) Cl2 
B) SO2 
C) PH3 
D) NO2 
E) Ne 
A) Cl2 
B) SO2 
C) PH3 
D) NO2 
E) Ne

Question 2

When active metals such as magnesium are immersed in acid solution, hydrogen gas is evolved.Calculate the volume of H2(g)at 30.1°C and 0.85 atm that can be formed when 275 mL of 0.725 M HCl solution reacts with excess Mg to give hydrogen gas and aqueous magnesium chloride.

Accepted Answer

A) 3.4 * 10-3 L 
B) 2.2 L 
C) 2.9 L 
D) 5.8 L 
E) 11.7 L 
A) 3.4 * 10-3 L 
B) 2.2 L 
C) 2.9 L 
D) 5.8 L 
E) 11.7 L

Question 3

What volume of H2 is formed at STP when 6.0 g of Al is treated with excess NaOH?
2NaOH + 2Al + 6H2O $\rarr$ 2NaAl(OH)4 + 3H2(g)

Accepted Answer

The answer of What volume of H2 is formed at...

Question 4

What mass of KClO3 must be decomposed to produce 126 L of oxygen gas at 133°C and 0.880 atm? (The other reaction product is solid KCl.)

Accepted Answer

A) 24.6 g 
B) 70.8 g 
C) 272 g 
D) 408 g 
E) 612 g 
A) 24.6 g 
B) 70.8 g 
C) 272 g 
D) 408 g 
E) 612 g

Question 5

The mole fraction of oxygen molecules in dry air is 0.2095. What volume of dry air at 1.00 atm and 25°C is required for burning 1.00 L of octane (C8H18, density = 0.7025 g/mL)completely, yielding carbon dioxide and water?

Accepted Answer

A) 718 L 
B) 367 L 
C) 8980 L 
D) 1880 L 
E) 150 L 
A) 718 L 
B) 367 L 
C) 8980 L 
D) 1880 L 
E) 150 L

Question 6

Which statement is false?

Accepted Answer

A) The average kinetic energies of molecules from samples of different "ideal" gases is the same at the same temperature. 
B) The molecules of an ideal gas are relatively far apart. 
C) All molecules of an ideal gas have the same kinetic energy at constant temperature. 
D) Molecules of a gas undergo many collisions with each other and the container walls. 
E) Molecules of greater mass have a lower average speed than those of less mass at the same temperature. 
A) The average kinetic energies of molecules from samples of different "ideal" gases is the same at the same temperature. 
B) The molecules of an ideal gas are relatively far apart. 
C) All molecules of an ideal gas have the same kinetic energy at constant temperature. 
D) Molecules of a gas undergo many collisions with each other and the container walls. 
E) Molecules of greater mass have a lower average speed than those of less mass at the same temperature.

Question 7

What is P in the table below?

Accepted Answer

The answer of What is P in the table below?...

Question 8

What will happen to the height (h)of the column of mercury in the manometer shown below if the stopcock is opened?

Accepted Answer

A) h will decrease 
B) h will not change 
C) h will increase 
D) not enough information given to answer the question 
A) h will decrease 
B) h will not change 
C) h will increase 
D) not enough information given to answer the question

Question 9

In an effort to address concerns about global warming, a power plant in Portland Oregon is designed to take all of its exhaust gases from its boilers and recycle the CO2 using the Solvay process to make sodium hydrogen carbonate.The reaction is shown below.
NH3(g)+ H2O(l)+ CO2(g)+ NaCl(aq)$\rarr$ NaHCO3(aq)+ NH4Cl(aq)
How many liters each of NH3 and CO2 (both at STP)would be consumed to produce 3.00 kg of sodium bicarbonate?

Accepted Answer

The volume of both N

Which one of these gases is "lighter-than-air"?

When active metals such as magnesium are immersed in acid solution, hydrogen gas is evolved.Calculate the volume of H₂(g)at 30.1°C and 0.85 atm that can be formed when 275 mL of 0.725 M HCl solution reacts with excess Mg to give hydrogen gas and aqueous magnesium chloride.

What volume of H₂ is formed at STP when 6.0 g of Al is treated with excess NaOH? 2NaOH + 2Al + 6H₂O $\rarr$ 2NaAl(OH)₄ + 3H₂(g)

What mass of KClO₃ must be decomposed to produce 126 L of oxygen gas at 133°C and 0.880 atm? (The other reaction product is solid KCl.)

The mole fraction of oxygen molecules in dry air is 0.2095. What volume of dry air at 1.00 atm and 25°C is required for burning 1.00 L of octane (C₈H₁₈, density = 0.7025 g/mL)completely, yielding carbon dioxide and water?

Which statement is false?

What is P in the table below?

What will happen to the height (h)of the column of mercury in the manometer shown below if the stopcock is opened?

Chemistry: The Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solution

Thermo-Chemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Chemistry in the Atmosphere

Entropy, Free Energy, and Equilibrium

Electrochemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Nuclear Chemistry

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

Exam 5: Gases

Which one of these gases is "lighter-than-air"?

When active metals such as magnesium are immersed in acid solution, hydrogen gas is evolved.Calculate the volume of H2(g)at 30.1°C and 0.85 atm that can be formed when 275 mL of 0.725 M HCl solution reacts with excess Mg to give hydrogen gas and aqueous magnesium chloride.

What volume of H2 is formed at STP when 6.0 g of Al is treated with excess NaOH? 2NaOH + 2Al + 6H2O →\rarr→ 2NaAl(OH)4 + 3H2(g)

What mass of KClO3 must be decomposed to produce 126 L of oxygen gas at 133°C and 0.880 atm? (The other reaction product is solid KCl.)

The mole fraction of oxygen molecules in dry air is 0.2095. What volume of dry air at 1.00 atm and 25°C is required for burning 1.00 L of octane (C8H18, density = 0.7025 g/mL)completely, yielding carbon dioxide and water?

Which statement is false?

What is P in the table below?

What will happen to the height (h)of the column of mercury in the manometer shown below if the stopcock is opened?

Chemistry: The Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solution

Thermo-Chemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Chemistry in the Atmosphere

Entropy, Free Energy, and Equilibrium

Electrochemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Nuclear Chemistry

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

When active metals such as magnesium are immersed in acid solution, hydrogen gas is evolved.Calculate the volume of H₂(g)at 30.1°C and 0.85 atm that can be formed when 275 mL of 0.725 M HCl solution reacts with excess Mg to give hydrogen gas and aqueous magnesium chloride.

What volume of H₂ is formed at STP when 6.0 g of Al is treated with excess NaOH? 2NaOH + 2Al + 6H₂O $\rarr$ 2NaAl(OH)₄ + 3H₂(g)

What mass of KClO₃ must be decomposed to produce 126 L of oxygen gas at 133°C and 0.880 atm? (The other reaction product is solid KCl.)

The mole fraction of oxygen molecules in dry air is 0.2095. What volume of dry air at 1.00 atm and 25°C is required for burning 1.00 L of octane (C₈H₁₈, density = 0.7025 g/mL)completely, yielding carbon dioxide and water?