Biology (Mader), 10th Edition

Chapter 2: Basic Chemistry

Post-Test

1
Which of the following elements is NOT one of the six that make up 98% of most organisms' body weight?
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)milk of magnesia
C)tomatoes
D)hydrochloric acid
5
Aquatic living things are able to survive the winter thanks to which 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 resists changes of state (from liquid to ice or liquid to steam).
6
The three isotopes of carbon 12C, 13C and 14C have different numbers of _______?
A)electrons
B)protons
C)neutrons
7
The combined number of ___________ will determine the number of electrons in orbital(s) around 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.
12
Which of the following atomic numbers indicates 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 parallel strands of DNA are held together by _______ bonds.
A)nonpolar
B)hydrogen
C)ionic
D)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)All of these
18
A pH of 5 is __________ times as acidic as a 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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