The Chemistry of Life
Practice Test
1.
What is the percent boron by mass in boric acid, H
3
BO
3
?
a.
45.30%
b.
17.50%
c.
22.10%
d.
38.00%
2.
Driven by concentration difference, the movement of molecules through a semipermeable memebrane is called ___________.
a.
boiling
b.
reverse movement
c.
capillarity
d.
osmosis
3.
The polarity of the water molecule accounts for water's ________________.
a.
unusually low melting point
b.
unusually high mass
c.
formula
d.
unusually high boiling point
4.
How many grams of NaCl are dissolved in 500.0 mL of a 0.05M solution of NaCl?
a.
2.92 g
b.
1.46 g
c.
0.05 g
d.
0.29 g
5.
______________ gives additional strength to a polymer.
a.
Cross-linking
b.
Single bonding
c.
Boiling
d.
Ionic bonding
6.
How many moles of sucrose, C
12
H
22
O
11
, are in 1222 g of sucrose?
a.
3.57
b.
10.8
c.
0.258
d.
1.22
7.
These two types of plastics are easiest to collect and sort for recycling.
a.
LDPE and PET
b.
PVC and PSEPS
c.
PET and HDPE
d.
PP and PVC
8.
If the theoretical yield of a reaction is 0.2100 g and the actual yield is 0.1880 g, what is the percent yield?
a.
89.50%
b.
51.30%
c.
112%
d.
11.00%
9.
What is the mass of 2.40 mol of copper?
a.
26.5 kg
b.
152 g
c.
3.78 mg
d.
5.65 g
10.
Scurvy is a rare disease in developed countries today because fresh fruits and vegetables provide this essential nutrient.
a.
vitamin E
b.
vitamin C
c.
iodine
d.
iron
11.
Organic compounds include most compounds that contain the element _____________.
a.
carbon
b.
iodine
c.
silicon
d.
nitrogen
12.
A functional group is the part of a molecule having a specific arrangement of atoms that is largely responsible for the _______________ of the parent molecule.
a.
volume
b.
mass
c.
chemical behavior
d.
density
13.
Alkanes with 20 or more carbon atoms are __________ at room temperature and pressure.
a.
liquids
b.
solids
c.
gases
d.
fluids
14.
This is a metallic element that reacts violently with water.
a.
sodium
b.
iron
c.
copper
d.
silver
15.
The sum of all the chemical reactions necessary for the life of an organism is its ____________.
a.
digestion
b.
respiration
c.
metabolism
d.
locomotion
16.
What is the product of an endothermic reaction in which an inorganic phosphate group is added to adenosine diphosphate?
a.
ADP
b.
lactic acid
c.
ATP
d.
glucose
17.
A mystery compound dissolves in water to produce a solution that does not conduct electricity. The compound cannot be __________.
a.
benzene
b.
sodium chloride
c.
ethanol
d.
butane
18.
DNA and RNA are the two kinds of ________________ found in cells.
a.
carbohydrates
b.
steroids
c.
lipids
d.
nucleic acids
19.
________________ have the prefixes cis- and trans-.
a.
Stereoisomers
b.
Di- and Tri- isomers
c.
Structural isomers
d.
Geometric isomers
20.
Atoms of this element do NOT participate in hydrogen bonding.
a.
oxygen
b.
fluorine
c.
nitrogen
d.
silicon
