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Michigan State University
CEM 141 CEM 141 Exam 3 Questions and
Answers 2026 Latest Update
change of state from solid -> liquid -> gas ________ energy— Ans: requires
energy needed to phase change from solid --> liquid --> gas comes from:—
Ans: the surroundings
when phases change from solid --> liquid --> gas, interactions are _______
between molecules— Ans: overcome
change of state from gas --> liquid --> solid ______ energy— Ans: releases
what happens to the energy from a phase change from gas --> liquid -->
solid?— Ans: released to surroundings
when phases change from gas --> liquid --> solid, interactions are _______
between molecules— Ans: formed
what happens when a substance melts?— Ans: the interactions between the
particles have to be overcome -- so that they can remove relative to each
other (that's what allows a liquid to flow)
melting and boiling points provide an estimate of:— Ans: the strength of the
attractive interactions between particles
which is stronger?? covalent bond/LDF— Ans: covalent bond
in a covalent bond, what is formed?— Ans: a new molecule
what is a LDF caused by?— Ans: fluctuating charge distribution
covalent bonds are the sharing of:— Ans: valence electrons
LDF's increase with....— Ans: the size of electron cloud
© 2026 All rights reserved
, 2 | Page
covalent bonds are caused by:— Ans: attraction between electrons of one
atom and the nucleus of another
LDFs are present where???— Ans: between all molecular species
is it hard or easy to predict covalent bond strength?— Ans: hard
when are covalent bonds present?— Ans: when atomic orbitals interact
constructively
covalent bonds are located:— Ans: between molecules/networks
LDFs occur between:— Ans: separate molecules
diamond has a high/low melting point???— Ans: high
graphite has a high/low melting point??— Ans: high
diamond is hard/soft?— Ans: hard
graphite is hard/soft?— Ans: soft
diamond's physical properties— Ans: brittle, translucent
diamond does/does not conduct electricity??— Ans: does not
graphite's physical properties— Ans: slippery, shiny, grey
graphite does/does not conduct electricity?— Ans: does
in diamond, each carbon forms how many bonds to how many carbons???—
Ans: 4 bonds to 4 identical carbons
in diamond, the bonds between carbons arrange themselves towards:— Ans:
the corners of a 4-sided figure (tetrahedron)
what is the C-C-C bond angle in diamond?— Ans: 109°
what model of bonding is used to explain the bonding in carbon?— Ans:
Valence Bond Theory
Valence Bond Theory— Ans: atomic orbitals overlap to form bonds
how are bonds often shown in the valence bond theory?— Ans: as "sticks"
© 2026 All rights reserved
Michigan State University
CEM 141 CEM 141 Exam 3 Questions and
Answers 2026 Latest Update
change of state from solid -> liquid -> gas ________ energy— Ans: requires
energy needed to phase change from solid --> liquid --> gas comes from:—
Ans: the surroundings
when phases change from solid --> liquid --> gas, interactions are _______
between molecules— Ans: overcome
change of state from gas --> liquid --> solid ______ energy— Ans: releases
what happens to the energy from a phase change from gas --> liquid -->
solid?— Ans: released to surroundings
when phases change from gas --> liquid --> solid, interactions are _______
between molecules— Ans: formed
what happens when a substance melts?— Ans: the interactions between the
particles have to be overcome -- so that they can remove relative to each
other (that's what allows a liquid to flow)
melting and boiling points provide an estimate of:— Ans: the strength of the
attractive interactions between particles
which is stronger?? covalent bond/LDF— Ans: covalent bond
in a covalent bond, what is formed?— Ans: a new molecule
what is a LDF caused by?— Ans: fluctuating charge distribution
covalent bonds are the sharing of:— Ans: valence electrons
LDF's increase with....— Ans: the size of electron cloud
© 2026 All rights reserved
, 2 | Page
covalent bonds are caused by:— Ans: attraction between electrons of one
atom and the nucleus of another
LDFs are present where???— Ans: between all molecular species
is it hard or easy to predict covalent bond strength?— Ans: hard
when are covalent bonds present?— Ans: when atomic orbitals interact
constructively
covalent bonds are located:— Ans: between molecules/networks
LDFs occur between:— Ans: separate molecules
diamond has a high/low melting point???— Ans: high
graphite has a high/low melting point??— Ans: high
diamond is hard/soft?— Ans: hard
graphite is hard/soft?— Ans: soft
diamond's physical properties— Ans: brittle, translucent
diamond does/does not conduct electricity??— Ans: does not
graphite's physical properties— Ans: slippery, shiny, grey
graphite does/does not conduct electricity?— Ans: does
in diamond, each carbon forms how many bonds to how many carbons???—
Ans: 4 bonds to 4 identical carbons
in diamond, the bonds between carbons arrange themselves towards:— Ans:
the corners of a 4-sided figure (tetrahedron)
what is the C-C-C bond angle in diamond?— Ans: 109°
what model of bonding is used to explain the bonding in carbon?— Ans:
Valence Bond Theory
Valence Bond Theory— Ans: atomic orbitals overlap to form bonds
how are bonds often shown in the valence bond theory?— Ans: as "sticks"
© 2026 All rights reserved
