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Chemistry Review
Test Description: Please answer the review questions.
Instructions: Answer all questions to get your test result.
1) The atomic mass of an atom can be found by
A
adding the number of neutrons and number of electrons in the atom.
B
adding the number of protons and number of neutrons in the atom.
C
adding the number of protons and number of electrons in the atom.
D
subtracting the number of neutrons from the number of protons in the atom.
2) The value of the atomic mass of an atom is
A
the average mass of all the different isomers of the atom.
B
the sum of the mass of the protons in the atom.
C
the average mass of all the different isotopes of the atom.
D
the average mass of all the different ions of the atom.
3) The isotope sodium-20 has how many neutrons?
A
10
B
12
C
9
D
11
4) The isotope sodium-20 has how many protons?
A
9
B
11
C
12
D
10
5) Isotopes of an element will always have the same
A
number of neutrons
B
number of electrons
C
number of protons
D
mass
6) Molar mass is measured in units of
A
amu
B
milliters
C
grams/mole
D
milligrams
7) A mole is the amount of a substance that contains as many particles as the number of atoms in 12 grams of what isotope?
A
Calcium-39
B
Carbon-12
C
Aluminum-26
D
Boron-12
8) All atoms of the same element have the same
A
mass numbers
B
number of neutrons
C
mass
D
number of protons
9) Isotopes of the same element have different
A
number of protons
B
number of electrons
C
atomic number
D
numbers of neutrons
10) Isotopes of the same element have different
A
positions on the periodic table
B
mass numbers
C
atomic numbers
D
elemental symbols
*select an answer for all questions
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