The Chemical Level Of Organization

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Question 1
Free
Multiple Choice

The smallest stable units of matter are

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A

atoms.

B

molecules.

C

protons.

D

neutrons.

E

electrons.

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Question 2
Free
Multiple Choice

The "atomic number" of an atom is determined by the number of ________ it has.

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A

electrons

B

protons

C

neutrons

D

protons + neutrons

E

protons + electrons

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Question 3
Free
Multiple Choice

The "atomic weight" of an atom reflects the average number of

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A

protons.

B

neutrons.

C

electrons.

D

protons + neutrons.

E

protons + neutrons + electrons.

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Question 4
Free
Multiple Choice

One mole of any element has the same

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A

mass.

B

weight.

C

number of atoms.

D

number of electrons.

E

All of the answers are correct.

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Question 5
Free
Multiple Choice

The nucleus of an atom consists of

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A

electrons.

B

protons.

C

neutrons.

D

protons + neutrons.

E

protons + electrons.

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Question 6
Multiple Choice

Isotopes of an element differ in the number of

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A
protons in the nucleus.
B
electrons in the nucleus.
C
neutrons in the nucleus.
D
electron clouds.
E
electrons in energy shells.
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Question 7
Multiple Choice

The innermost electron shell in an atom holds up to ________ electrons.

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A
1
B
2
C
4
D
6
E
8
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Question 8
Multiple Choice

Radioisotopes have unstable

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A
ions.
B
nuclei.
C
isotopes.
D
electron clouds.
E
protons.
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Question 9
Multiple Choice

By weight, which element is the most plentiful in the human body?

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A
sulfur
B
sodium
C
oxygen
D
potassium
E
carbon
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Question 10
Multiple Choice

Which of these lists contains only trace elements?

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A
sulfur, chlorine, oxygen
B
selenium, hydrogen, calcium
C
boron, oxygen, carbon
D
silicon, fluorine, tin
E
cobalt, calcium, sodium
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Question 11
Multiple Choice

Helium (HE) has an atomic number of 2. It is chemically stable because it

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A
is neutral in electrical charge.
B
readily ionizes to react with other atoms.
C
has a full outer electron shell.
D
will form a covalent bond with another He atom.
E
lacks electrons, thus the He atom is stable.
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Question 12
Multiple Choice

Which element commonly has only a proton as its nucleus?

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A
helium
B
neon
C
argon
D
hydrogen
E
carbon
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Question 13
Multiple Choice

By weight, which element is the second most abundant in the human body?

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A
oxygen
B
carbon
C
hydrogen
D
nitrogen
E
calcium
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Question 14
Multiple Choice

In any given molecule, the sum of the atomic weights of its component atoms is called

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A
molecular mass.
B
molecular weight.
C
atomic mass.
D
atomic weight.
E
chemical mass.
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Question 15
Multiple Choice

Given the following approximate values, calculate the molecular weight for NaCl. Atomic number for Na: 11, Atomic weight for Na: 23 g/mol, Atomic number for Cl: 17,Atomic weight for Cl: 35 g/mol, Boiling point for Cl: -34 °C

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A
11 g/mol
B
28 g/mol
C
34 g/mol
D
40 g/mol
E
58 g/mol
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Question 16
Multiple Choice

If an element is composed of atoms with an atomic number of 6 and a mass number of 14, then a non-isotopicatom of this element contains

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A
6 protons.
B
8 electrons.
C
8 neutrons.
D
6 protons and 8 electrons.
E
6 protons and 8 neurons.
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Question 17
Multiple Choice

________ is a pure substance composed of atoms of only one kind.

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A
element
B
macromolecule
C
ion
D
isotope
E
compound
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Question 18
Multiple Choice

The center of an atom is called the

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A
core.
B
hub.
C
middle point.
D
nucleus.
E
focus.
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Question 19
Multiple Choice

Electrons whirl around the center of the atom at high speed, forming a(n)

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A
spiral.
B
figure 8.
C
cylinder.
D
electron cloud.
E
helix.
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Question 20
Multiple Choice

Electrons in an atom occupy an orderly series of electron shells or

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A
energy levels.
B
electron clouds.
C
energy circles.
D
electron lanes.
E
energy fields.
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