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