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Ps Ch 4
Test Description: Atoms
Instructions: Answer all questions to get your test result.
1) If the average atomic mass of carbon is 12.01 u, 1 mole of pure carbon will have a mass of
A
12 mol
B
12.01 g
C
6 g
D
6 mol
2) The average atomic mass of potassium is about 39 u. What is the mass of 2 mol of potassium
A
0.39 g
B
78 g
C
39 g
D
0.78 g
3) You have 6.5 mol of chromium, which has a molar mass of approximately 52 g/mol. What is the mass in grams of this amount of chromium
A
3.38g
B
33.8 g
C
338 g
D
3.38 kg
4) Which statement about the modern model of the atom is not true
A
Electrons can be found between energy levels
B
atoms of the same element are exactly alike
C
electrons can be found only in certain energy levels
D
the precise location of electrons cannot be predicted
5) Which statement is true according to Dalton's theory
A
atoms of the same element differ in electric charge
B
atoms of different elements can join to form larger atoms
C
atoms can be subdivided into smaller particles
D
atoms of the same element are exactly alike
6) According to Bohr's theory, and electron's path around the nucleus defines its
A
electric charge
B
atomic mass
C
energy level
D
speed
7) An atom's mass number equals the number of
A
neutrons
B
protons plus the number of electrons
C
protons plus the number of neutrons
D
protons
8) a unified atomic mass unit is equal to
A
one fourth the mass of a lithium ion
B
one fifteenth the mass of a nitrogen 15 atom
C
one twelfth the mass of a carbon 12 atom
D
one half the mass of a hydrogen atom
9) Avogadro's number is defined as the number of particles in
A
one liter of the substance
B
one gram of the substance
C
one mole of the substance
D
one kilogram of the substance
10) Molar Mass is defined as
A
the mass in grams of one mole of a substance
B
the SI base unit that describes the amount of a substance
C
the number of particles in one mole of a substance
D
the amount of a substance necessary to have a positive charge
*select an answer for all questions
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