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Chemistry Chapter 3 Atoms
Test Description: Review for Chapter 3 Test
Instructions: Answer all questions to get your test result.
1) What is the molar mass of the element oxygen?
A
13
B
16
C
11
D
19
2) What part of the atom was discovered as a result of Rutherford\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'s gold foil experiments?
A
electrons
B
energy levels
C
isotope
D
nucleus
3) What is the SI base unit used to measure the amount of a substance
A
kilogram
B
meter
C
Kelvin
D
mole
4) What is the overall charge of an unreacted atom?
A
neutral
B
negative
C
positive
D
positive and negative
5) The law of _______ states that a compound is always composed of the same elements in the same proportion by mass.
A
definite proportions
B
conservation of energy
C
conservation of mass
D
multiple proportions
6) The isotope uranium-235 has 92 protons and 143 electrons. What, then, is its mass number?
A
143
B
92
C
235
D
impossible to determine
7) The charge of an electron is what?
A
-2
B
-1
C
-1
D
0
8) According to Bohr\'s model of the atom, electrons behave like what?
A
waves on a vibrating string
B
light energy in a vacuum
C
planets orbiting the sun
D
planets rotating on their axes
9) Atoms of elements that are in the same group have the same number of what?
A
valence electrons
B
neutrons
C
protons
D
protons and electrons
10) According to modern atomic theory, it is nearly impossible to determine an electron's exact _________.
A
color
B
mass
C
position
D
charge
*select an answer for all questions
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