Question 1 (5 points) Saved
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If the hexagons in the picture are representative of glucose molecules, this is most likely a representation of which glucose polymer?
Question 1 options:

A)

Cellulose

B)

Starch

C)

Glycogen

D)

Dietary fiber
Question 2 (5 points)
After writing and balancing the equation, what's the next step in using bond energies to calculate the enthalpy of a reaction?
Question 2 options:

A)

Write down the bond energies for the products and reactants.

B)

Sum the bond energies of the products.

C)

Write the structures of the products and reactants.

D)

Subtract the bond energies of the products from the reactants.
Question 3 (5 points)
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The starting diol for this molecule is
Question 3 options:

A)

propan-1,3-diol.

B)

ethanol.

C)

propan-1,3-dioic acid.

D)

ethan-1,2-diol.
Question 4 (5 points)
Which of the following do all substituted hydrocarbons have in common?
Question 4 options:

A)

They're short-chain hydrocarbons.

B)

They all contain oxygen.

C)

A hydrogen on an alkyl chain has been replaced by a heteroatom.

D)

They all have halogen groups.
Question 5 (5 points)
Bond energies can be used to estimate the energy of a reaction. Why is this only an estimate?
Question 5 options:

A)

The bonds in all molecules are the same, but not all molecules have bonds that are easily measured.

B)

It's difficult to measure such a small amount of energy.

C)

The same bond in a different molecule has a different energy. For example, O-H in water versus ethanol has different energies.

D)

It's difficult to isolate an individual bond.
Question 6 (5 points)
The system international (SI) unit for energy is
Question 6 options:

A)

kilocalorie.

B)

calorie.

C)

joule.

D)

pound.
Question 7 (5 points)
Steroids have a generic structure that's composed of three six-membered rings and one
Question 7 options:

A)

four-membered ring.

B)

three-membered ring.

C)

five-membered ring.

D)

two-membered ring.
Question 8 (5 points)
The primary role of the protein keratin is to
Question 8 options:

A)

speed up the formation of nails and hair.

B)

provide strength to nails and hair.

C)

make curly hair curly.

D)

tell the body to store sugar.
Question 9 (5 points)
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The name of the structure shown is
Question 9 options:

A)

oct-7-ene-2-yne.

B)

hept-7-ene-2-yne.

C)

oct-1-ene-6-yne.

D)

hept-1-ene-6-yne.
Question 10 (5 points)
DNA utilizes free nucleotides in the cell to manufacture RNA, which is then sent to the ribosome to
Question 10 options:

A)

make DNA.

B)

make proteins.

C)

make RNA.

D)

make energy.
Question 11 (5 points)
Once the activity of americium in a smoke detector falls below 5 percent of its original activity, it's no longer able to effectively detect smoke and trigger the alarm. If the half-life of americium-241 is approximately 432.2 years, how many years will it take before the americium-241 is unable to detect smoke?
Question 11 options:

A)

10 years

B)

20 years

C)

1,868 years

D)

2 years
Question 12 (5 points)
Esters are most likely to be encountered in what department in a large department store?
Question 12 options:

A)

Perfume department

B)

Men's clothing department

C)

Women's clothing department

D)

Shoe department
Question 13 (5 points)
The half-life of a radioactive nucleus is the time it takes for _ of the nuclei in a sample to decay.
Question 13 options:

A)

half

B)

100 units

C)

one-fourth

D)

50 disintegrations
Question 14 (5 points)
A lethal dose of radiation is
Question 14 options:

A)

20 rems

B)

500 mrems

C)

500 rems

D)

300 mrems
Question 15 (5 points)
Planar cyclic hydrocarbons are called
Question 15 options:

A)

alkenes.

B)

alkynes.

C)

aromatics.

D)

alkanes.
Question 16 (5 points)
Curium, named for Marie Curie, has approximately 25 different isotopes that emit an alpha particle when their nuclei decay. If curium-247, the most abundant nuclide, emits an alpha particle, what daughter nuclide is formed?
Question 16 options:

A)

Californium-251

B)

Californium-249

C)

Plutonium-243

D)

Plutonium-251
Question 17 (5 points)
Reactions that produce energy and have a negative amount of free energy are
Question 17 options:

A)

exothermic reactions.

B)

endothermic reactions.

C)

exergonic reactions.

D)

endergonic reactions.
Question 18 (5 points)
A Geiger counter detects radiation. Each click corresponds to _ nucleus/nuclei decaying.
Question 18 options:

A)

three

B)

two

C)

one

D)

four
Question 19 (5 points)
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The figure shows the metabolic pathway for aerobic respiration. What part of the process do boxes A and B represent?
Question 19 options:

A)

Citric acid cycle

B)

Glycolysis

C)

Pyruvate oxidation

D)

The transport of electrons by NADH and FADH2
Question 20 (5 points)
A nuclide is defined as
Question 20 options:

A)

a distinct isotope of an atom.

B)

all isotopes of an atom.

C)

the nucleus of an atom.

D)

the radioactive isotope of an atom.

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