CHEM 219 MODULES 1–8 EXAMS
WITH COMPREHENSIVE QUESTIONS
AND CORRECT ANSWERS |2026
LATEST UPLOAD |ALREADY GRADED
A+ |100% CORRECT
1. If an element in the same group as silver (Ag) has the electron
configuration [Kr]5s24d9, what is the identity of this element and how does
its electron configuration affect its chemical properties compared to silver?
Copper (Cu), it is less stable than silver.
Gold (Au), it is more reactive than silver.
Rhodium (Rh), it has similar reactivity to silver.
Palladium (Pd), it is less conductive than silver.
2. A gas is contained in a rigid container at a temperature of 300 K and has a
pressure of 1 atm. If the temperature is increased to 600 K while keeping
the volume constant, what will be the new pressure of the gas?
0.5 atm
1 atm
2 atm
4 atm
3. If you have 1.0 kilogram of epinephrine, how many moles would that be?
Use the molar mass of epinephrine (C9H13NO3) in your calculation.
5.46
, 5.46 x 10^3
2.5
5.46 x 10^-3
4. Explain why atomic number is the key property used to arrange elements
in the periodic table rather than atomic mass.
, Atomic number reflects the number of protons, which defines the
element, while atomic mass can vary due to isotopes.
Atomic number is easier to measure than atomic mass.
Atomic mass is not a stable property, while atomic number is always
constant.
Atomic number is based on electron configuration, which is more
relevant than atomic mass.
Atomic mass does not account for the number of neutrons.
5. Which type of substance is characterized by being dull, brittle, and a poor
conductor of electricity in any state?
A metallic element
A nonmetallic element
An elemental metalloid
An ionic compound
6. If a new element, X, is discovered with an atomic number between
nitrogen and oxygen, predict its ionization energy relative to these two
elements.
X will have a higher ionization energy than oxygen.
X will have a lower ionization energy than nitrogen.
X will have an ionization energy between that of nitrogen and
oxygen.
X will have the same ionization energy as nitrogen.
7. What is the formula used to compare the rates of effusion of two gases?
Graham's Law of Effusion
Dalton's Law of Partial Pressures
, Boyle's Law
Charles's Law
8. Which group on the periodic table is characterized by having a complete
valence shell, making them generally unreactive and unlikely to gain an
electron?
Alkali metals
Alkaline earth metals
Halogens
Chalcogens
Noble gases
9. What is the mass percent of sulfur in Al2(SO4)3? Molar mass = 342.15 g/mol
2.8
35.5
28.11
70.1
none of the above
10. Explain why Ti4+ has 18 electrons despite having an atomic number of 22.
Because it has lost 4 electrons due to ionization.
Because it has gained 4 electrons during bonding.
Because it has a mass number of 46.
Because it is a neutral atom.
WITH COMPREHENSIVE QUESTIONS
AND CORRECT ANSWERS |2026
LATEST UPLOAD |ALREADY GRADED
A+ |100% CORRECT
1. If an element in the same group as silver (Ag) has the electron
configuration [Kr]5s24d9, what is the identity of this element and how does
its electron configuration affect its chemical properties compared to silver?
Copper (Cu), it is less stable than silver.
Gold (Au), it is more reactive than silver.
Rhodium (Rh), it has similar reactivity to silver.
Palladium (Pd), it is less conductive than silver.
2. A gas is contained in a rigid container at a temperature of 300 K and has a
pressure of 1 atm. If the temperature is increased to 600 K while keeping
the volume constant, what will be the new pressure of the gas?
0.5 atm
1 atm
2 atm
4 atm
3. If you have 1.0 kilogram of epinephrine, how many moles would that be?
Use the molar mass of epinephrine (C9H13NO3) in your calculation.
5.46
, 5.46 x 10^3
2.5
5.46 x 10^-3
4. Explain why atomic number is the key property used to arrange elements
in the periodic table rather than atomic mass.
, Atomic number reflects the number of protons, which defines the
element, while atomic mass can vary due to isotopes.
Atomic number is easier to measure than atomic mass.
Atomic mass is not a stable property, while atomic number is always
constant.
Atomic number is based on electron configuration, which is more
relevant than atomic mass.
Atomic mass does not account for the number of neutrons.
5. Which type of substance is characterized by being dull, brittle, and a poor
conductor of electricity in any state?
A metallic element
A nonmetallic element
An elemental metalloid
An ionic compound
6. If a new element, X, is discovered with an atomic number between
nitrogen and oxygen, predict its ionization energy relative to these two
elements.
X will have a higher ionization energy than oxygen.
X will have a lower ionization energy than nitrogen.
X will have an ionization energy between that of nitrogen and
oxygen.
X will have the same ionization energy as nitrogen.
7. What is the formula used to compare the rates of effusion of two gases?
Graham's Law of Effusion
Dalton's Law of Partial Pressures
, Boyle's Law
Charles's Law
8. Which group on the periodic table is characterized by having a complete
valence shell, making them generally unreactive and unlikely to gain an
electron?
Alkali metals
Alkaline earth metals
Halogens
Chalcogens
Noble gases
9. What is the mass percent of sulfur in Al2(SO4)3? Molar mass = 342.15 g/mol
2.8
35.5
28.11
70.1
none of the above
10. Explain why Ti4+ has 18 electrons despite having an atomic number of 22.
Because it has lost 4 electrons due to ionization.
Because it has gained 4 electrons during bonding.
Because it has a mass number of 46.
Because it is a neutral atom.
