AP Biology (Mader), 11th Edition

Chapter 2: Basic Chemistry

Post-Test

1
Which of the following is NOT one of the six elements that make up 95% of the body weight of organisms?
A)Hydrogen
B)Nitrogen
C)Carbon
D)Iron
2
Which of the following statements is true?
A)All isotopes give off subatomic particles.
B)All isotopes are radioactive.
C)All isotopes have the same number of protons.
D)All isotopes have the same number of neutrons.
3
What type of bond is formed when atoms share electrons?
A)Ionic
B)Covalent
C)Hydrogen
4
Which of the following has a basic pH?
A)Lemon juice
B)Stomach antacids
C)Tomatoes
D)Hydrochloric acid
5
Aquatic organisms are able to survive the winter due to which specific property of water?
A)It is less dense as a solid than as a liquid.
B)It is cohesive and adhesive.
C)It is the universal solvent.
D)It has a pH of 7.0.
6
The three isotopes of carbon 12C, 13C and 14C have different numbers of _______?
A)electrons
B)protons
C)neutrons
7
The number of ___________ is always equal to the number of electrons in a neutral atom.
A)orbitals
B)neutrons
C)bonds
D)protons
8
If an atom has an atomic number of 17 and an atomic mass of 35, the number of neutrons in its nucleus equals _____.
A)17
B)18
C)52
9
An electrically neutral atom with an atomic number of 7 will have _____ electron shell(s).
A)one
B)two
C)three
D)four
10
Which bond is most easily broken?
A)A hydrogen bond
B)A triple covalent bond
C)A single covalent bond
11
Which of the following statements is true?
A)There are two polar covalent bonds in water.
B)There are two ionic bonds in water.
C)There is one ionic and one covalent bond in water.
D)Electrons are less attracted to oxygen than hydrogen in a water molecule.
12
Which of the following atomic numbers characterizes the element with the highest valence number?
A)6
B)8
C)10
D)14
13
Normal rainfall has a pH of___________.
A)3.0
B)5.6
C)7.0
D)8.3
14
If a patient is injected with radioactive iodine, a radioisotope scan would show it appear in the ___________.
A)pancreas
B)thyroid
C)adrenals
D)salivary gland
15
Hydrophobic molecules tend to be _________.
A)nonpolar
B)inorganic minerals
C)ionic
D)water soluble
16
The two strands of nucleotides in DNA are held together by _______ bonds.
A)nonpolar covalent
B)hydrogen
C)ionic
D)polar covalent
17
The calcium ion (Ca2+) _____.
A)has accepted two protons
B)has given away two electrons
C)will form a covalent bond with the chlorine ion (Cl-)
D)has lost two protons
18
A solution with a pH of 5 is __________ times more acidic than a solution of pH of 9.
A)1,000
B)10,000
C)40
D)4
19
Hydrogen bonds form when ___________.
A)atoms share electrons
B)a slightly negative atom is attracted to a slightly positive atom
C)atoms gain electrons
D)atoms lose protons
20
The only atom that has a nucleus with no neutrons is _________.
A)argon
B)carbon
C)oxygen
D)hydrogen
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