CHEM 130 - EXAM 2 TEST
QUESTIONS AND 100% CORRECT
ANSWERS 2025-2026 UPDATED.
Lewis structures? - Answer used to diagram the sharing of valence electrons for single &
multiple bonds in molecules
Generally, a solution of an organic compound in water will be electrically....
charged
nonconductive
highly ionized
insulated
highly conductive. - Answer nonconductive
What bonds in an organic compound? - Answer C atoms primarily form with H atoms and
other C atoms. But ALWAYS contain C and H
Other elements commonly found in organic compounds... - Answer O, S, N, P & halogens, F,
Cl, Br
How do you determine the amount of bonds an element forms? - Answer Look at their
valence electrons and subtract from 8. (to complete octet)
What elements are shown in a line structure? - Answer H bonded to N, O, S, or anything
other than C. DON'T SHOW BOND
Organic compounds that are poorly soluble in water behave that way because they are
covalently bonded
highly polar
ionically bonded
,Oil does not dissolve in water because - Answer Non-similar IMFs. Oil is nonpolar therefore
only has dispersion IMFs while water is polar and has dispersion, dipole-dipole, and hydrogen
bonding.
What is considered Hydrogen Bonding? - Answer F-H O-H N-H
Homogeneous solution - Answer composed of a solute that is completely soluble in a solvent
Miscible - Answer soluble in all proportions
How is the miscibility of a liquid with water related to the liquid's polarity?
The less polar the liquid, the more likely that it is miscible with water
The more polar the liquid, the more likely that it is miscible with water
The polarity of a liquid does not affect its miscibility with water
The more polar the liquid, the less likely that it is miscible with water. - Answer The more
polar the liquid, the more likely that it is miscible with water
permanent dipoles - Answer only present in POLAR molecules
formula for an alkene
CnH2n+3
CnH2n-2
CnH2n
CnH2n-3
CnH2n+2 - Answer CnH2n
formula for an alkyne.
CnHn-2
CnH2n
,Which intermolecular force is characteristic of compounds with low molar mass, which are
liquids at room temperature and have relatively high boiling points? - Answer Hydrogen
Bonds
explain the meaning of the phrase "like dissolves like" - Answer A solvent and solute with
similar intermolecular forces will readily form a solution.
Which of the following should be immiscible with carbon tetrachloride, CCl4?
Br2
C3H8
CH3CH2OH
C4H10
C6H12 - Answer CH3CH2OH
The term "miscible" is used to describe which type of solution?
liquid/liquid
gas/liquid
gas/gas
liquid/solid
all of the above - Answer liquid/liquid
dipole-dipole forces - Answer intermolecular forces that exist between POLAR molecules.
Active only when the molecules are close together. The strengths of intermolecular attractions
increase when polarity increases
dispersion forces - Answer weak forces that result from temporary shifts in the density of
electrons in electron clouds
-distribution can become momentarily unsymmetrical--> *temporary dipole attracting
neighboring molecules*
ONLY FORCE BETWEEN NONPOLAR MOLECULES
, What IMFs do nonpolar molecules have? - Answer dispersion
Which factor is most important in determining the chemistry of an organic molecule? Why?
the number of carbon-carbon bonds
the melting point
the number of branches in the carbon chain
the functional groups
the number of carbon-hydrogen bonds - Answer the functional groups. sets of connected
atoms that determine properties and reactivity of parent molecule
What does the "R" mean in functional groups? - Answer group of C and H atoms of any size.
the group of C and H atoms does NOT affect the functionality of the compound
how do you determine formal charge? - Answer valence electrons - (nonbonded+bonded
electrons)
fatty acid - Answer unbranched carbon chain with a carboxylic acid at one end
unsaturated fatty acid - Answer contains one or more carbon-carbon double bonds
What do cis double bonds do? What happens? - Answer form bends or "kinks" that prevent
the unsaturated fatty acids to stack closely together. this weakens the dispersion forces between
the carbon chains and requires less energy to separate the molecules.
saturated and unsaturated fatty acid melting points - Answer unsaturated - lower
saturated - higher
saturated fatty acids - Answer usually solid at room temp
what elements can expand their octet? - Answer period 3 and below
QUESTIONS AND 100% CORRECT
ANSWERS 2025-2026 UPDATED.
Lewis structures? - Answer used to diagram the sharing of valence electrons for single &
multiple bonds in molecules
Generally, a solution of an organic compound in water will be electrically....
charged
nonconductive
highly ionized
insulated
highly conductive. - Answer nonconductive
What bonds in an organic compound? - Answer C atoms primarily form with H atoms and
other C atoms. But ALWAYS contain C and H
Other elements commonly found in organic compounds... - Answer O, S, N, P & halogens, F,
Cl, Br
How do you determine the amount of bonds an element forms? - Answer Look at their
valence electrons and subtract from 8. (to complete octet)
What elements are shown in a line structure? - Answer H bonded to N, O, S, or anything
other than C. DON'T SHOW BOND
Organic compounds that are poorly soluble in water behave that way because they are
covalently bonded
highly polar
ionically bonded
,Oil does not dissolve in water because - Answer Non-similar IMFs. Oil is nonpolar therefore
only has dispersion IMFs while water is polar and has dispersion, dipole-dipole, and hydrogen
bonding.
What is considered Hydrogen Bonding? - Answer F-H O-H N-H
Homogeneous solution - Answer composed of a solute that is completely soluble in a solvent
Miscible - Answer soluble in all proportions
How is the miscibility of a liquid with water related to the liquid's polarity?
The less polar the liquid, the more likely that it is miscible with water
The more polar the liquid, the more likely that it is miscible with water
The polarity of a liquid does not affect its miscibility with water
The more polar the liquid, the less likely that it is miscible with water. - Answer The more
polar the liquid, the more likely that it is miscible with water
permanent dipoles - Answer only present in POLAR molecules
formula for an alkene
CnH2n+3
CnH2n-2
CnH2n
CnH2n-3
CnH2n+2 - Answer CnH2n
formula for an alkyne.
CnHn-2
CnH2n
,Which intermolecular force is characteristic of compounds with low molar mass, which are
liquids at room temperature and have relatively high boiling points? - Answer Hydrogen
Bonds
explain the meaning of the phrase "like dissolves like" - Answer A solvent and solute with
similar intermolecular forces will readily form a solution.
Which of the following should be immiscible with carbon tetrachloride, CCl4?
Br2
C3H8
CH3CH2OH
C4H10
C6H12 - Answer CH3CH2OH
The term "miscible" is used to describe which type of solution?
liquid/liquid
gas/liquid
gas/gas
liquid/solid
all of the above - Answer liquid/liquid
dipole-dipole forces - Answer intermolecular forces that exist between POLAR molecules.
Active only when the molecules are close together. The strengths of intermolecular attractions
increase when polarity increases
dispersion forces - Answer weak forces that result from temporary shifts in the density of
electrons in electron clouds
-distribution can become momentarily unsymmetrical--> *temporary dipole attracting
neighboring molecules*
ONLY FORCE BETWEEN NONPOLAR MOLECULES
, What IMFs do nonpolar molecules have? - Answer dispersion
Which factor is most important in determining the chemistry of an organic molecule? Why?
the number of carbon-carbon bonds
the melting point
the number of branches in the carbon chain
the functional groups
the number of carbon-hydrogen bonds - Answer the functional groups. sets of connected
atoms that determine properties and reactivity of parent molecule
What does the "R" mean in functional groups? - Answer group of C and H atoms of any size.
the group of C and H atoms does NOT affect the functionality of the compound
how do you determine formal charge? - Answer valence electrons - (nonbonded+bonded
electrons)
fatty acid - Answer unbranched carbon chain with a carboxylic acid at one end
unsaturated fatty acid - Answer contains one or more carbon-carbon double bonds
What do cis double bonds do? What happens? - Answer form bends or "kinks" that prevent
the unsaturated fatty acids to stack closely together. this weakens the dispersion forces between
the carbon chains and requires less energy to separate the molecules.
saturated and unsaturated fatty acid melting points - Answer unsaturated - lower
saturated - higher
saturated fatty acids - Answer usually solid at room temp
what elements can expand their octet? - Answer period 3 and below
