UNE Chem 1021L Final Exam Questions
With All Correct Updated Answers.
ionic bond - Answer formed by atoms of opposing charges and resulting molecules are polar
examples of ionic bonds - Answer NaCl, LiBr, NaBr, NaF
covalent bond - Answer formed by atoms sharing valence electrons instead of donating or
accepting electrons
examples of covalent bonds - Answer O2 (nonpolar)
CH4 (nonpolar)
H2 (nonpolar)
N2 (nonpolar)
H2O (polar)
NH3 (polar)
boiling point (BP) - Answer temperature at which a compound changes from a liquid to a gas
what are the three factors affecting the boiling point of a compound? - Answer 1.
intermolecular forces
2. molecular weight (MW)
3. structural order
trend of intermolecular forces and BP - Answer the stronger the intermolecular forces, the
higher the BP
trend of MW and BP - Answer the higher MW, the higher the BP
trend of structural order and BP - Answer the more ordered a molecule (linear or planar), the
higher the BP
, butanol
trend of isomer alcohols and BP - Answer from highest to lowest BP:
primary alcohols (one carbon), secondary alcohols (two carbons), tertiary alcohols (three
carbons)
alcohols - Answer organic derivatives of water (H2O) where one of the O-H bonds is replaced
with C-O
electronegativity (eN) - Answer measure of how strongly electrons are attracted to an atom
eN in two bonded atoms - Answer the more eN atom will exert a stronger pull on the shared
electrons than the less eN atom. this unequal sharing of electrons leads to partial NEGATIVE
charge on more eN atom, partial POSITIVE charge on less eN atom.
e.g. H2O
hydrogen bond donor - Answer hydrogen atoms in water
hydrogen bond acceptor - Answer oxygen atom in water
hydrogen bonding - Answer type of intermolecular bond characterized by hydrogen bond
donor and hydrogen bond acceptor
how is alcohol different from water? - Answer alcohol contains an unpolarized carbon group,
adding a nonpolar feature to the molecule
trend of carbon chain in alcohols - Answer increasing the number of carbon chains results in
increased repulsion, decreased solubility in water
trend of number of H bond donors and acceptors and alcohols - Answer increasing the
number of H bond donors and acceptors increases (e.g. alcohol groups), solubility of alcohol in
water increases
With All Correct Updated Answers.
ionic bond - Answer formed by atoms of opposing charges and resulting molecules are polar
examples of ionic bonds - Answer NaCl, LiBr, NaBr, NaF
covalent bond - Answer formed by atoms sharing valence electrons instead of donating or
accepting electrons
examples of covalent bonds - Answer O2 (nonpolar)
CH4 (nonpolar)
H2 (nonpolar)
N2 (nonpolar)
H2O (polar)
NH3 (polar)
boiling point (BP) - Answer temperature at which a compound changes from a liquid to a gas
what are the three factors affecting the boiling point of a compound? - Answer 1.
intermolecular forces
2. molecular weight (MW)
3. structural order
trend of intermolecular forces and BP - Answer the stronger the intermolecular forces, the
higher the BP
trend of MW and BP - Answer the higher MW, the higher the BP
trend of structural order and BP - Answer the more ordered a molecule (linear or planar), the
higher the BP
, butanol
trend of isomer alcohols and BP - Answer from highest to lowest BP:
primary alcohols (one carbon), secondary alcohols (two carbons), tertiary alcohols (three
carbons)
alcohols - Answer organic derivatives of water (H2O) where one of the O-H bonds is replaced
with C-O
electronegativity (eN) - Answer measure of how strongly electrons are attracted to an atom
eN in two bonded atoms - Answer the more eN atom will exert a stronger pull on the shared
electrons than the less eN atom. this unequal sharing of electrons leads to partial NEGATIVE
charge on more eN atom, partial POSITIVE charge on less eN atom.
e.g. H2O
hydrogen bond donor - Answer hydrogen atoms in water
hydrogen bond acceptor - Answer oxygen atom in water
hydrogen bonding - Answer type of intermolecular bond characterized by hydrogen bond
donor and hydrogen bond acceptor
how is alcohol different from water? - Answer alcohol contains an unpolarized carbon group,
adding a nonpolar feature to the molecule
trend of carbon chain in alcohols - Answer increasing the number of carbon chains results in
increased repulsion, decreased solubility in water
trend of number of H bond donors and acceptors and alcohols - Answer increasing the
number of H bond donors and acceptors increases (e.g. alcohol groups), solubility of alcohol in
water increases
