CHEM 230 FINAL EXAM QUESTIONS & ANSWERS
Many of the properties of water can be accounted for by the fact that - Answer -it is
polar
Compounds exist as a result of - Answer -chemical reaction
In general, chemical bonding brings together elements in the correct ratios so that all of
the atoms involved (except H and He) form a/an - Answer -octet
What type of bond exists when valence electrons are shared between two atoms? -
Answer -covalent bond
What type of electron pair is indicated by the arrow in the image of Cl2 - Answer -
bonding pair
What is the optimal molecular geometry for carbons in saturated alkanes? - Answer -
Tetrahedral
Rank the bonds below in order of polarity least polar to most polar: C-H C-O O-O O-H -
Answer -O-O, C-H, C-O, O-H
When the lewis structure is correctly completed, what is the total valence electrons for
this molecule? (picture of COOOH lewis dot) - Answer -24
What is the approximate bond angle around the central carbon atom when the molecule
in the previous question is correctly drawn? - Answer -120 degrees
What combination correctly describes a molecule of CO2 in terms of polarity? - Answer
-polar bonds, non-polar molecule
What combination correctly describes a molecule of NH3 in terms of polarity - Answer -
polar bonds, polar molecule
What is true about lewis structures - Answer -covalent bonds involve the sharing of
electrons, the electrons shared between two atoms are called bonding pairs, only
bonding electrons count toward the octet of both atoms, electrons around a single atom
are called lone pairs
What is special about carbon - Answer -forms 4 covalent bonds, has single, double and
triple bonds, bonds to itself forming chains and rings
Simple definition of organic chemistry - Answer -the study of carbon-containing
compounds and their chemistry
, What is NOT one of the major subcategories of hydrocarbons - Answer -aldehydes
In which of the following categories of hydrocarbons can the number of carbons or
hydrogens be correctly calculated using the formula: CnH2n+2 - Answer -alkanes
Hydrocarbons contain - Answer -only hydrogen and carbon
Fuctionalized hydrocarbons often contain ______ in addition to the answer in the
previous question - Answer -oxygen, nitrogen, and sulfur
Alkenes contain __________ - Answer -one or more double bonds between carbon
atoms
best describes an aromatic hydrocarbon - Answer -six-membered rings with alternating
single and double bonds, the bond character is being midway between a single and a
double bond
Which of the following best describes the polarity of
hydrocarbons - Answer -carbon-hydrogen bond are mostly nonpolar but any polarity
would be symmetrically arranged about the central carbon atoms making the molecules
nonpolar
Each carbon atom in a hydrocarbon attains a/an ___ of electrons - Answer -octet
Which of the following represents a correctly expressed condensed structural formula
for butane - Answer -CH3CH2CH2CH3
Name the following alkane: CH3CH2CH2CH2CH2CH2CH2CH3 - Answer -octane
What is arguably the most important property of alkanes and the associated reaction
type - Answer -flammability, combustion
What is a subcategory of hydrocarbons that are sturated - Answer -alkanes
What is NOT one of the cool things that carbon can do: - Answer -Form double bonds
with hydrogens
Isomers can be defined as - Answer -molecules with the same molecular formula, but
different bonding arrangements
What is not true about functionalized hydrocarbons - Answer -compounds containing
the same functional group are called hydrocarbons
The addition of the -OH makes alcohols - Answer -polar
Many of the properties of water can be accounted for by the fact that - Answer -it is
polar
Compounds exist as a result of - Answer -chemical reaction
In general, chemical bonding brings together elements in the correct ratios so that all of
the atoms involved (except H and He) form a/an - Answer -octet
What type of bond exists when valence electrons are shared between two atoms? -
Answer -covalent bond
What type of electron pair is indicated by the arrow in the image of Cl2 - Answer -
bonding pair
What is the optimal molecular geometry for carbons in saturated alkanes? - Answer -
Tetrahedral
Rank the bonds below in order of polarity least polar to most polar: C-H C-O O-O O-H -
Answer -O-O, C-H, C-O, O-H
When the lewis structure is correctly completed, what is the total valence electrons for
this molecule? (picture of COOOH lewis dot) - Answer -24
What is the approximate bond angle around the central carbon atom when the molecule
in the previous question is correctly drawn? - Answer -120 degrees
What combination correctly describes a molecule of CO2 in terms of polarity? - Answer
-polar bonds, non-polar molecule
What combination correctly describes a molecule of NH3 in terms of polarity - Answer -
polar bonds, polar molecule
What is true about lewis structures - Answer -covalent bonds involve the sharing of
electrons, the electrons shared between two atoms are called bonding pairs, only
bonding electrons count toward the octet of both atoms, electrons around a single atom
are called lone pairs
What is special about carbon - Answer -forms 4 covalent bonds, has single, double and
triple bonds, bonds to itself forming chains and rings
Simple definition of organic chemistry - Answer -the study of carbon-containing
compounds and their chemistry
, What is NOT one of the major subcategories of hydrocarbons - Answer -aldehydes
In which of the following categories of hydrocarbons can the number of carbons or
hydrogens be correctly calculated using the formula: CnH2n+2 - Answer -alkanes
Hydrocarbons contain - Answer -only hydrogen and carbon
Fuctionalized hydrocarbons often contain ______ in addition to the answer in the
previous question - Answer -oxygen, nitrogen, and sulfur
Alkenes contain __________ - Answer -one or more double bonds between carbon
atoms
best describes an aromatic hydrocarbon - Answer -six-membered rings with alternating
single and double bonds, the bond character is being midway between a single and a
double bond
Which of the following best describes the polarity of
hydrocarbons - Answer -carbon-hydrogen bond are mostly nonpolar but any polarity
would be symmetrically arranged about the central carbon atoms making the molecules
nonpolar
Each carbon atom in a hydrocarbon attains a/an ___ of electrons - Answer -octet
Which of the following represents a correctly expressed condensed structural formula
for butane - Answer -CH3CH2CH2CH3
Name the following alkane: CH3CH2CH2CH2CH2CH2CH2CH3 - Answer -octane
What is arguably the most important property of alkanes and the associated reaction
type - Answer -flammability, combustion
What is a subcategory of hydrocarbons that are sturated - Answer -alkanes
What is NOT one of the cool things that carbon can do: - Answer -Form double bonds
with hydrogens
Isomers can be defined as - Answer -molecules with the same molecular formula, but
different bonding arrangements
What is not true about functionalized hydrocarbons - Answer -compounds containing
the same functional group are called hydrocarbons
The addition of the -OH makes alcohols - Answer -polar
