CHEM 104 Exam 2 Questions and
Answers Verified Solutions Latest Update
2026/2027
Question:
Hydrogen fluoride will react with glass (silicon dioxide, SiO2) according to the equation below.
What mass of HF is required to react completely with 16.0 g of glass? [Molar masses: Si, 28.09
g/mol; F, 19.00 g/mol; H, 1.01 g/mol; O, 16.00 g/mol]
4HF(g) + SiO2(s) → SiF4(g) + 2H2O(g)
Answer:
21.3 g
Question:
Two molecules of ethane experience what type of attractive forces?
Answer:
London forces
Question:
A solution contains the label 0.2 M KNO3. What is the correct interpretation of this concentration?
Answer:
There are 0.2 moles of KNO3 in 1 L of solution.
Question:
Which properly represents the Lewis structure of hydrogen sulfide, H2S?
Question:
If 5.20 g of HCl is added to enough distilled water to form 3.00 L of solution, what is the molarity
of the solution? [Molecular weight: HCl, 36.46 amu]
,Answer:
0.0475 M
Question:
A patient needs 0.300 g of a solid drug preparation per day. How many 10.0 mg tablets must be
given to the patient per day?
Answer:
30.0 tablets
Question:
What term is used to describe atoms of the same element that have different masses?
Answer:
isotopes
Question:
Classify the following reaction: H2SO4(aq) + 2KOH(aq) → K2SO4(aq) + 2H2O(aq)
Answer:
acid - base
Question:
Which of the following statements correctly describes Charles's Law?
Answer:
The volume of a gas is directly proportional to the Kelvin temperature of the gas, if the pressure
and amount of gas remain constant.
Question:
Which statement concerning the elements fluorine, chlorine, bromine, and iodine is FALSE?
Answer:
They all have the same electron configuration.
,Question:
Choose the best classification of the reaction represented by the following equation: MgO(s) +
CO2(g) → MgCO3(s)
Answer:
combination
Question:
In what region on the periodic table are elements with the lowest electronegativity values found?
Answer:
bottom left corner
Question:
The modern periodic law states that the physical and chemical properties of the elements are
periodic functions of what property?
Answer:
atomic number
Question:
Tungsten is a metal containing 74 protons, and is used widely in the electronics industry. What is
the chemical symbol for tungsten?
Answer:
W
Question:
What kind of bonding exists in substances that consist of discrete molecules?
Answer:
covalent
, Question:
What is the mass of 4.35 moles of aluminum?
Answer:
117 g
Question:
Emergency treatment of cardiac arrest victims sometimes involves injection of a calcium chloride
(CaCl2) solution directly into the heart muscle. Which statement about the compound CaCl2 is
FALSE?
Answer:
The anion in this compound is Cl2−.
Question:
What is the mass of 3.01 mol of sulfur atoms?
Answer:
96.5 g
Question:
What is the mass of a 0.150 mole sample of sulfur?
Answer:
4.81g
Question:
What are the three primary particles found in an atom?
Answer:
electron, neutron, and proton
Question:
Which has the greatest mass, one atom of carbon, one atom of hydrogen, or one atom of lithium?
Answers Verified Solutions Latest Update
2026/2027
Question:
Hydrogen fluoride will react with glass (silicon dioxide, SiO2) according to the equation below.
What mass of HF is required to react completely with 16.0 g of glass? [Molar masses: Si, 28.09
g/mol; F, 19.00 g/mol; H, 1.01 g/mol; O, 16.00 g/mol]
4HF(g) + SiO2(s) → SiF4(g) + 2H2O(g)
Answer:
21.3 g
Question:
Two molecules of ethane experience what type of attractive forces?
Answer:
London forces
Question:
A solution contains the label 0.2 M KNO3. What is the correct interpretation of this concentration?
Answer:
There are 0.2 moles of KNO3 in 1 L of solution.
Question:
Which properly represents the Lewis structure of hydrogen sulfide, H2S?
Question:
If 5.20 g of HCl is added to enough distilled water to form 3.00 L of solution, what is the molarity
of the solution? [Molecular weight: HCl, 36.46 amu]
,Answer:
0.0475 M
Question:
A patient needs 0.300 g of a solid drug preparation per day. How many 10.0 mg tablets must be
given to the patient per day?
Answer:
30.0 tablets
Question:
What term is used to describe atoms of the same element that have different masses?
Answer:
isotopes
Question:
Classify the following reaction: H2SO4(aq) + 2KOH(aq) → K2SO4(aq) + 2H2O(aq)
Answer:
acid - base
Question:
Which of the following statements correctly describes Charles's Law?
Answer:
The volume of a gas is directly proportional to the Kelvin temperature of the gas, if the pressure
and amount of gas remain constant.
Question:
Which statement concerning the elements fluorine, chlorine, bromine, and iodine is FALSE?
Answer:
They all have the same electron configuration.
,Question:
Choose the best classification of the reaction represented by the following equation: MgO(s) +
CO2(g) → MgCO3(s)
Answer:
combination
Question:
In what region on the periodic table are elements with the lowest electronegativity values found?
Answer:
bottom left corner
Question:
The modern periodic law states that the physical and chemical properties of the elements are
periodic functions of what property?
Answer:
atomic number
Question:
Tungsten is a metal containing 74 protons, and is used widely in the electronics industry. What is
the chemical symbol for tungsten?
Answer:
W
Question:
What kind of bonding exists in substances that consist of discrete molecules?
Answer:
covalent
, Question:
What is the mass of 4.35 moles of aluminum?
Answer:
117 g
Question:
Emergency treatment of cardiac arrest victims sometimes involves injection of a calcium chloride
(CaCl2) solution directly into the heart muscle. Which statement about the compound CaCl2 is
FALSE?
Answer:
The anion in this compound is Cl2−.
Question:
What is the mass of 3.01 mol of sulfur atoms?
Answer:
96.5 g
Question:
What is the mass of a 0.150 mole sample of sulfur?
Answer:
4.81g
Question:
What are the three primary particles found in an atom?
Answer:
electron, neutron, and proton
Question:
Which has the greatest mass, one atom of carbon, one atom of hydrogen, or one atom of lithium?
