AnswersMO-Chemistry B-CRCumulative Exam

Cumulative Exam — Cumulative exam Answers

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Which numbers are shown in the symbol for a radioactive nuclide?

A
the atomic number and the number of neutrons
B
the mass number and the number of neutrons
C
the atomic number and the mass number
D
the number of electrons and the number of protons
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A certain radionuclide is used to diagnose lymphoma. An atom of this radionuclide contains 31 protons and 36 neutrons. Which statement is correct about the radionuclide?

A
The atomic number is 31, the mass number is 67, and its symbol is .
Option A
B
The atomic number is 31, the mass number is 67, and its symbol is .
Option B
C
The atomic number is 67, the mass number is 31, and its symbol is .
Option C
D
The atomic number is 67, the mass number is 31, and its symbol is .
Option D
43

Which statement is true about the electrons in each polar bond of a water molecule?

A
They are more attracted by the oxygen atom than by the hydrogen atom.
B
They are more attracted by the hydrogen atom than by the oxygen atom.
C
They are equally attracted by the hydrogen and oxygen atoms.
D
They are equally repelled by the hydrogen and oxygen atoms.
44

Which processes are responsible for the formation of glaciers?

A
impact and deflation
B
plucking and abrasion
C
deposition and erosion
D
accumulation and compaction
45

Which statement best explains water’s ability to dissolve covalent compounds?

A
Water can dissolve polar covalent compounds through dipole-dipole interactions.
B
Water can dissolve nonpolar covalent compounds through hydrogen-bonding interactions.
C
Water can dissolve polar covalent compounds through ion-dipole interactions.
D
Water can dissolve nonpolar covalent compounds through dipole-dipole interactions.
46

Which sphere is the atmosphere interacting with when winds are produced over oceans?

A
asthenosphere
B
biosphere
C
hydrosphere
D
lithosphere
47

These statements describe three different reactions. 1 - An atom shares electrons with another atom. 2 - The nucleus of an atom is split apart. 3 - An atom gains an electron from another atom. Which reaction(s) most likely release the greatest amount of energy?

A
1
B
2
C
1 and 3
D
2 and 3
48

What is a base used in deodorants?

A
sorbitol
B
carrageenan
C
magnesium hydroxide
D
sodium lauryl sulfate
49

Which statement would be true about a water molecule if it had a linear shape?

A
It would contain ionic bonds.
B
It would have improved special properties.
C
It would easily bond with other water molecules.
D
It would be a nonpolar molecule.
50

How many neutrons does the isotope N-14 have?

A
6
B
7
C
8
D
9

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