and
CH3-CH-CH3 | CH3
CH3-O-CH3
and
CH3-CH2-OH
a. Pair A only
b. Pair B only
c. Both A and B
d. Neither A nor B
How many structural isomers exist for the alkane C4H10?
a. 1
b. 2
c. 3
d. 4
What is the IUPAC name for the hydrocarbon CH3CH2CH2CH2CH3?
a. butane
b. pentane
c. hexane
d. octane
Benedict's reagent is used to test for reducing sugars. Which of the following would give a positive result?
a. starch
b. sucrose
c. fructose
d. cellulose
Identify the functional group in the molecule shown below:
O || CH3 — C — CH3
a. aldehyde
b. ketone
c. alcohol
d. ester
The functional group in the compound below characterizes which family?
O || CH3 — C — O — CH3
a. ester
b. ether
c. carboxylic acid
d. amine
A primary (1°) alcohol has the —OH group attached to a carbon bonded to how many other carbons?
a. zero
b. one
c. two
d. three
Which of the following organic substances is expected to be highly flammable?
a. ethanol (C2H5OH)
b. potassium nitrate (KNO3)
c. calcium carbonate (CaCO3)
d. distilled water
Which of these alcohols would be the LEAST soluble in water?
a. methanol
b. ethanol
c. propanol
d. 1-octanol
The complete oxidation of a primary alcohol yields a(n):
a. alkane
b. ketone
c. carboxylic acid
d. ether
The Biuret test is used to detect the presence of:
a. simple sugars
b. starches
c. peptide bonds in proteins
d. saturated fats
Amino acids are linked together by ________________ bonds to form proteins.
a. ionic
b. peptide
c. glycosidic
d. ester
Which condition is NOT a method for denaturing a protein?
a. heating the sample
b. adding a strong acid
c. adding heavy metal ions
d. adding a neutral buffer
Calculate the mass percent (m/m %) of a solution made by dissolving 20.0 g of salt into 180.0 g of distilled water:
a. 10.0 %
b. 11.1 %
c. 20.0 %
d. 9.00 %
How many milliliters (mL) of a 10.0% (m/v) NaOH solution are required to obtain 50.0 g of NaOH solute?
a. 5.00 mL
b. 50.0 mL
c. 500 mL
d. 5000 mL
What is the molarity (M) of a solution prepared by dissolving 80.0 g of NaOH (MW = 40.0 g/mol) into enough water to make 2.0 L of solution?
a. 1.0 M
b. 2.0 M
c. 0.50 M
d. 4.0 M
How many moles of NaCl are contained in 400 mL of a 2.0 M NaCl solution?
a. 0.80 moles
b. 8.0 moles
c. 0.50 moles
d. 1.25 moles
Which functional group consists of an oxygen atom single-bonded to two carbon atoms (R — O — R’)?
a. ester
b. ether
c. alcohol
d. ketone
What is the IUPAC name for the simplest alkyne, consisting of a two-carbon chain with a triple bond?
a. ethene
b. ethyne
c. propane
d. propyne
A straight or branched chain hydrocarbon that does NOT contain a benzene ring is termed:
a. aromatic
b. aliphatic
c. phenol
d. halogenated
A laboratory sample is measured to have a pH of 10.5. This substance is:
a. acidic
b. basic
c. neutral
d. pure water
A deep blue-black color resulting from the addition of Iodine (I2) confirms the presence of:
a. starch
b. glucose
c. protein
d. fat
Rationale: Proteins are formed by linking amino acids with peptide (amide) bonds.
Rationale: Buffers are used to stabilize proteins, not denature them.
Rationale: (20.0 g salt) / (200.0 g total solution) × 100 = 10.0%.
Rationale: 50.0 g / (0.10 g/mL) = 500 mL.
Rationale: 80.0g / 40.0g/mol = 2.0 mol; 2.0 mol / 2.0 L = 1.0 M.
Rationale: 2.0 M × 0.400 L = 0.80 moles.
Rationale: The ether linkage consists of an oxygen bonded between two carbons.
Rationale: Ethyne (acetylene) is the simplest alkyne with a triple bond.
Rationale: Aliphatic compounds include alkanes, alkenes, and alkynes.
Rationale: pH 10.5 is significantly greater than the neutral point of 7.0.
Rationale: Iodine specifically indicates the presence of starch via a blue-black color.
