CEM 141 MSU Exam 2 Latest 2026
UPDATED Exam Questions and Verified
Answers (2026/2027) | Graded A+ |
100% Success
Chemical Reactions - correct answer -Reaction that involves the rearrangements
of valence electrons, the element does not change.
Nuclear Reactions - correct answer -Reaction that involves the nucleus, often
results in change of element, accompanied by mass changes.
Nuclear Fusion - correct answer -Adding two small/light nuclei together to create
more stable element, releases energy, occurs in stars
Ex: Hydrogen burning and helium burning.
Nuclear Fission - correct answer -The fragmentation of heavy nuclei to form light,
more stable nuclei, releases energy
Can become a chain reaction.
,Radioactive Decay - correct answer -Nucleus emits/captures particles of energy in
the form of electromagnetic radiation. a, b, y.
Strong Force - correct answer -Force which holds nucleus together at small
distances, doesn't govern electrons, is attractive for alike and neutral charges.
E = mc2 - correct answer -Binding energy, the energy released when mass is
converted to energy (nuclear reaction).
Emergent Properties - correct answer -When atoms interact to form larger
molecules/structures, like melting/boiling point.
Nanoparticles - correct answer -At the size of 1-100nm, have different properties
than bulk materials, depends on surface area to size ratio.
Why do bonds form? - correct answer -Valence electrons of one atom are
attracted to the nuclei of other atoms.
Covalent Bond - correct answer -Two hydrogen atoms interact and form this, each
nucleus is attracting both electrons, bond length = most stable, lowest PE,
formation releases energy to surroundings
, Strong, hard to predict bond strength, present only when atomic orbitals interact
constructively, within molecules or networks.
Molecular Orbital Theory - correct answer -Combining n atomic orbitals to n
molecular orbitals.
Antibonding Orbitals - correct answer -Atomic orbitals combine destructively to
form a molecular orbital of higher energy, destabilizing, out of phase, creates
sigma star orbital.
Bonding Orbitals - correct answer -Atomic orbitals combine constructively to form
a molecular orbital of lower energy, stabilizing, in phase, creates sigma orbital.
In He-He both boding and antibonding MOs are occupied. Because their energies
are equal and opposite _______. - correct answer -He Doesn't Bond.
H Bond - correct answer -In H-H only the bonding MO is occupied, leading to net
stabilization of the interaction
Breaking bond: enough energy has to be added to raise an electron to the
antibonding orbital.
UPDATED Exam Questions and Verified
Answers (2026/2027) | Graded A+ |
100% Success
Chemical Reactions - correct answer -Reaction that involves the rearrangements
of valence electrons, the element does not change.
Nuclear Reactions - correct answer -Reaction that involves the nucleus, often
results in change of element, accompanied by mass changes.
Nuclear Fusion - correct answer -Adding two small/light nuclei together to create
more stable element, releases energy, occurs in stars
Ex: Hydrogen burning and helium burning.
Nuclear Fission - correct answer -The fragmentation of heavy nuclei to form light,
more stable nuclei, releases energy
Can become a chain reaction.
,Radioactive Decay - correct answer -Nucleus emits/captures particles of energy in
the form of electromagnetic radiation. a, b, y.
Strong Force - correct answer -Force which holds nucleus together at small
distances, doesn't govern electrons, is attractive for alike and neutral charges.
E = mc2 - correct answer -Binding energy, the energy released when mass is
converted to energy (nuclear reaction).
Emergent Properties - correct answer -When atoms interact to form larger
molecules/structures, like melting/boiling point.
Nanoparticles - correct answer -At the size of 1-100nm, have different properties
than bulk materials, depends on surface area to size ratio.
Why do bonds form? - correct answer -Valence electrons of one atom are
attracted to the nuclei of other atoms.
Covalent Bond - correct answer -Two hydrogen atoms interact and form this, each
nucleus is attracting both electrons, bond length = most stable, lowest PE,
formation releases energy to surroundings
, Strong, hard to predict bond strength, present only when atomic orbitals interact
constructively, within molecules or networks.
Molecular Orbital Theory - correct answer -Combining n atomic orbitals to n
molecular orbitals.
Antibonding Orbitals - correct answer -Atomic orbitals combine destructively to
form a molecular orbital of higher energy, destabilizing, out of phase, creates
sigma star orbital.
Bonding Orbitals - correct answer -Atomic orbitals combine constructively to form
a molecular orbital of lower energy, stabilizing, in phase, creates sigma orbital.
In He-He both boding and antibonding MOs are occupied. Because their energies
are equal and opposite _______. - correct answer -He Doesn't Bond.
H Bond - correct answer -In H-H only the bonding MO is occupied, leading to net
stabilization of the interaction
Breaking bond: enough energy has to be added to raise an electron to the
antibonding orbital.
