Chem Final Exam Practice Questions
and Answers
What is the molecular mass of N2O?
A) 30 g/mole
B) 30 u
C) 44 g/mole
D) 44 u - correct answer-D) 44 u
In the reaction CH4+ 2 O2→ CO2+ 2 H2O, how many moles of oxygen are required to
burn 8.0 g of methane?
A) 0.5
B) 1.0
C) 2.0
D) 32 - correct answer-B) 1.0
Atom economy is
A) the calculation of the number of atoms conserved in the desired product rather than
in waste.
B) counting the atoms in the starting material and product.
C) having green by-products.
D) having green starting materials. - correct answer-A) the calculation of the number of
atoms conserved in the desired product rather than in waste.
The molarity of a solution that contains 8.0 g of NaOH in a liter of solution is
A) 0.020 M.
B) 0.20 M.
C) 2.0 M.
D) 0.80 M. - correct answer-B) 0.20 M
How many mL of a 4.0% NaOH solution do you need to have 16 g of NaOH?
A) 160 mL
B) 250 mL
C) 400 mL
D) 640 mL - correct answer-C) 400 mL
The process by which a solid is converted to a gas is called
A) liquefaction.
B) vaporization.
C) condensation.
D) sublimation. - correct answer-D) sublimation
,The degree of order of matter is directly proportional to the cohesive forces that
holdmatter together. In other words, the more organized the state of matter, the stronger
the "glue" that holds it together. Which of the following ranks these cohesive forces from
the state with the strongest to that with the weakest cohesive forces?
A) gas > liquid > solid
B) liquid > solid > gas
C) solid > liquid > gas
D) solid = gas = liquid - correct answer-C) solid > liquid > gas
All of the following statements about scCO2 are correct EXCEPT
A) It can dissolve substances, just as liquids can.
B) It flows rapidly, just as gases do.
C) It causes cancer.
D) It can make processes occur more rapidly. - correct answer-C) It causes cancer
Ionic compounds have strong forces between particles. This means that generally ionic
compounds are ________ at room temperature.
A) solids
B) liquids
C) gases
D) covalently bonded - correct answer-A) solids
Which of the following compounds will have the highest melting point?
A) SO2
B) BaF2
C) N2H4
D) SCl6 - correct answer-B) BaF2
What is the predominant intermolecular force between HCl molecules?
A) ionic bonds
B) hydrogen bonds
C) dipole forces
D) dispersion forces - correct answer-C) dipole forces
What is the predominant intermolecular force between N2molecules?
A) dipole forces
B) dispersion forces
C) hydrogen bonds
D) ionic bonds - correct answer-B) dispersion forces
When an ionic compound dissolves in water,
A) the negative ends of water molecules surround the negative ions.
B) the positive ends of water molecules surround the positive ions.
C) the negative ends of water molecules surround the positive ions.
, D) the negative ends of water molecules surround both the negative and the positive
ions. - correct answer-C) the negative ends of water molecules surround the positive
ions
Which of the following is NOT a postulate of the kinetic-molecular theory?
A) Molecules of a gas move rapidly and in straight lines.
B) The molecules in a gas are tiny compared to the distance between them.
C)If two molecules collide with each other, the total energy of the molecules before the
collision is the same as their total energy after the collision.
D) The molecules of a gas are strongly attracted to each other. - correct answer-D) The
molecules of a gas are strongly attracted to each other
At STP, 22.4 liters of nitrogen gas, N2, will have a mass of
A) 14.0 g
.B) 22.4 g
.C) 28.0 g.
D) 35.0 g. - correct answer-C) 28.0 g
A balloon is inflated outdoors on a cold day in North Dakota at a temperature of -35°C to
a volume of 3.0 L. The pressure remains constant. What is the volume of the balloon
indoors at a temperature of 25°C?
A) 2.4 L
B) 3.8 L
C) 3.2 L
D) 2.1 L - correct answer-B) 3.8 L
A gas is enclosed in a cylinder fitted with a piston. The volume of the gas is 5.00 L at
0.500 atm pressure. The piston is moved to decrease thevolume to 3.00 L. Which of the
following is a reasonable value for the pressure of the gas at the greater volume? The
temperature is constant.
A) 0.300 atm
B) 0.833 atm
C) 30.0 atm
D) 0.0333 atm - correct answer-B) 0.833 atm
Use the ideal gas law to calculate the volume occupied by 0.400 mol of nitrogen gas at
3.00 atm pressure and at 27°C. R = 0.0821 L *atm/(K*mol).
A) 3.28 L
B) 17.7 L
C) 0.296 L
D) 16.7 L - correct answer-A) 3.28 L
Which is NOT a characteristic of acids?
A) taste bitter
B) turn litmus red
C) react with bases to form salts
and Answers
What is the molecular mass of N2O?
A) 30 g/mole
B) 30 u
C) 44 g/mole
D) 44 u - correct answer-D) 44 u
In the reaction CH4+ 2 O2→ CO2+ 2 H2O, how many moles of oxygen are required to
burn 8.0 g of methane?
A) 0.5
B) 1.0
C) 2.0
D) 32 - correct answer-B) 1.0
Atom economy is
A) the calculation of the number of atoms conserved in the desired product rather than
in waste.
B) counting the atoms in the starting material and product.
C) having green by-products.
D) having green starting materials. - correct answer-A) the calculation of the number of
atoms conserved in the desired product rather than in waste.
The molarity of a solution that contains 8.0 g of NaOH in a liter of solution is
A) 0.020 M.
B) 0.20 M.
C) 2.0 M.
D) 0.80 M. - correct answer-B) 0.20 M
How many mL of a 4.0% NaOH solution do you need to have 16 g of NaOH?
A) 160 mL
B) 250 mL
C) 400 mL
D) 640 mL - correct answer-C) 400 mL
The process by which a solid is converted to a gas is called
A) liquefaction.
B) vaporization.
C) condensation.
D) sublimation. - correct answer-D) sublimation
,The degree of order of matter is directly proportional to the cohesive forces that
holdmatter together. In other words, the more organized the state of matter, the stronger
the "glue" that holds it together. Which of the following ranks these cohesive forces from
the state with the strongest to that with the weakest cohesive forces?
A) gas > liquid > solid
B) liquid > solid > gas
C) solid > liquid > gas
D) solid = gas = liquid - correct answer-C) solid > liquid > gas
All of the following statements about scCO2 are correct EXCEPT
A) It can dissolve substances, just as liquids can.
B) It flows rapidly, just as gases do.
C) It causes cancer.
D) It can make processes occur more rapidly. - correct answer-C) It causes cancer
Ionic compounds have strong forces between particles. This means that generally ionic
compounds are ________ at room temperature.
A) solids
B) liquids
C) gases
D) covalently bonded - correct answer-A) solids
Which of the following compounds will have the highest melting point?
A) SO2
B) BaF2
C) N2H4
D) SCl6 - correct answer-B) BaF2
What is the predominant intermolecular force between HCl molecules?
A) ionic bonds
B) hydrogen bonds
C) dipole forces
D) dispersion forces - correct answer-C) dipole forces
What is the predominant intermolecular force between N2molecules?
A) dipole forces
B) dispersion forces
C) hydrogen bonds
D) ionic bonds - correct answer-B) dispersion forces
When an ionic compound dissolves in water,
A) the negative ends of water molecules surround the negative ions.
B) the positive ends of water molecules surround the positive ions.
C) the negative ends of water molecules surround the positive ions.
, D) the negative ends of water molecules surround both the negative and the positive
ions. - correct answer-C) the negative ends of water molecules surround the positive
ions
Which of the following is NOT a postulate of the kinetic-molecular theory?
A) Molecules of a gas move rapidly and in straight lines.
B) The molecules in a gas are tiny compared to the distance between them.
C)If two molecules collide with each other, the total energy of the molecules before the
collision is the same as their total energy after the collision.
D) The molecules of a gas are strongly attracted to each other. - correct answer-D) The
molecules of a gas are strongly attracted to each other
At STP, 22.4 liters of nitrogen gas, N2, will have a mass of
A) 14.0 g
.B) 22.4 g
.C) 28.0 g.
D) 35.0 g. - correct answer-C) 28.0 g
A balloon is inflated outdoors on a cold day in North Dakota at a temperature of -35°C to
a volume of 3.0 L. The pressure remains constant. What is the volume of the balloon
indoors at a temperature of 25°C?
A) 2.4 L
B) 3.8 L
C) 3.2 L
D) 2.1 L - correct answer-B) 3.8 L
A gas is enclosed in a cylinder fitted with a piston. The volume of the gas is 5.00 L at
0.500 atm pressure. The piston is moved to decrease thevolume to 3.00 L. Which of the
following is a reasonable value for the pressure of the gas at the greater volume? The
temperature is constant.
A) 0.300 atm
B) 0.833 atm
C) 30.0 atm
D) 0.0333 atm - correct answer-B) 0.833 atm
Use the ideal gas law to calculate the volume occupied by 0.400 mol of nitrogen gas at
3.00 atm pressure and at 27°C. R = 0.0821 L *atm/(K*mol).
A) 3.28 L
B) 17.7 L
C) 0.296 L
D) 16.7 L - correct answer-A) 3.28 L
Which is NOT a characteristic of acids?
A) taste bitter
B) turn litmus red
C) react with bases to form salts
