CEM 141 EXAM 3 2026 ATOMIC STRUCTURE
AND PERIODIC TABLE PRACTICE SET
ANSWERS FULL SOLUTION
◉ energy needed to phase change from solid --> liquid --> gas comes
from:
Answer: the surroundings
◉ when phases change from solid --> liquid --> gas, interactions are
_______ between molecules
Answer: overcome
◉ change of state from gas --> liquid --> solid ______ energy
Answer: releases
◉ what happens to the energy from a phase change from gas -->
liquid --> solid?
Answer: released to surroundings
◉ when phases change from gas --> liquid --> solid, interactions are
_______ between molecules
Answer: formed
,◉ what happens when a substance melts?
Answer: 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:
Answer: the strength of the attractive interactions between particles
◉ which is stronger?? covalent bond/LDF
Answer: covalent bond
◉ in a covalent bond, what is formed?
Answer: a new molecule
◉ what is a LDF caused by?
Answer: fluctuating charge distribution
◉ covalent bonds are the sharing of:
Answer: valence electrons
◉ LDF's increase with....
,Answer: the size of electron cloud
◉ covalent bonds are caused by:
Answer: attraction between electrons of one atom and the nucleus of
another
◉ LDFs are present where???
Answer: between all molecular species
◉ is it hard or easy to predict covalent bond strength?
Answer: hard
◉ when are covalent bonds present?
Answer: when atomic orbitals interact constructively
◉ covalent bonds are located:
Answer: between molecules/networks
◉ LDFs occur between:
Answer: separate molecules
◉ diamond has a high/low melting point???
, Answer: high
◉ graphite has a high/low melting point??
Answer: high
◉ diamond is hard/soft?
Answer: hard
◉ graphite is hard/soft?
Answer: soft
◉ diamond's physical properties
Answer: brittle, translucent
◉ diamond does/does not conduct electricity??
Answer: does not
◉ graphite's physical properties
Answer: slippery, shiny, grey
◉ graphite does/does not conduct electricity?
Answer: does
AND PERIODIC TABLE PRACTICE SET
ANSWERS FULL SOLUTION
◉ energy needed to phase change from solid --> liquid --> gas comes
from:
Answer: the surroundings
◉ when phases change from solid --> liquid --> gas, interactions are
_______ between molecules
Answer: overcome
◉ change of state from gas --> liquid --> solid ______ energy
Answer: releases
◉ what happens to the energy from a phase change from gas -->
liquid --> solid?
Answer: released to surroundings
◉ when phases change from gas --> liquid --> solid, interactions are
_______ between molecules
Answer: formed
,◉ what happens when a substance melts?
Answer: 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:
Answer: the strength of the attractive interactions between particles
◉ which is stronger?? covalent bond/LDF
Answer: covalent bond
◉ in a covalent bond, what is formed?
Answer: a new molecule
◉ what is a LDF caused by?
Answer: fluctuating charge distribution
◉ covalent bonds are the sharing of:
Answer: valence electrons
◉ LDF's increase with....
,Answer: the size of electron cloud
◉ covalent bonds are caused by:
Answer: attraction between electrons of one atom and the nucleus of
another
◉ LDFs are present where???
Answer: between all molecular species
◉ is it hard or easy to predict covalent bond strength?
Answer: hard
◉ when are covalent bonds present?
Answer: when atomic orbitals interact constructively
◉ covalent bonds are located:
Answer: between molecules/networks
◉ LDFs occur between:
Answer: separate molecules
◉ diamond has a high/low melting point???
, Answer: high
◉ graphite has a high/low melting point??
Answer: high
◉ diamond is hard/soft?
Answer: hard
◉ graphite is hard/soft?
Answer: soft
◉ diamond's physical properties
Answer: brittle, translucent
◉ diamond does/does not conduct electricity??
Answer: does not
◉ graphite's physical properties
Answer: slippery, shiny, grey
◉ graphite does/does not conduct electricity?
Answer: does
