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The Atom
The Atom
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A #chemistry #quiz to review #atomic #history , #atoms , #light , and #waves
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Questions
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Answers
1
Which of the following is NOT true about the nucleus of an atom?
it contains almost all the atom's mass
it is positively charged
it determines the atom's volume
it is very dense
2
For a certain color of light, the frequency is 3.30 x 10
14
Hz. What is the wavelength?
9.9 x 1022
2.19 x 1034
9.09 x 10-7
2.19 x 10-19
3
For an electron to relax back to it's ground state:
the electron should go from a low level to a high level
it must get excited
energy must be absorbed
energy must be emitted
4
The product of frequency and Planck's constant equals:
Energy
Time
Wavelength
The speed of light
5
What information does this picture give?
238 protons, 92 neutrons, 90 electrons
146 neutrons, 92 protons, 90 electrons
146 neutrons, 92 protons, 92 electrons
238 neutrons, 92 protons, 92 electrons
6
Which is the best statement about Louis de Broglie's theory?
light behaves like particles.
you cannot determine the exact location of an electron.
using math, electrons exist in 3D clouds called orbitals.
electrons could have a dual wave-particle nature.
7
What ideas have we changed/modified from Dalton's atomic theory?
Atoms cannot be divided
Atoms of the same element have to be exactly the same.
Atoms of different elements have different properties
Atoms can combine in chemical reactions
8
Changing the number of neutrons in an atom changes:
the atomic number
the charge
the isotope
the dumb
9
Whose experiment discovered the nucleus of the atom?
Dalton
Bohr
Einstein
Rutherford
10
the photoelectric effect proved:
that light can act as a particle
the electrons are light
the light can act as a wave
that the nucleus is very small and dense
11
What did Rutherford conclude after most of the particles passed straight through the gold foil?
atoms were indivisible.
electrons formed the nucleus.
atoms were mostly empty space.
atoms contained no charged particles.
12
Which model explains electrons as being in specific, allowed orbits?
planetary model
plum-pudding model
quantum model
nuclear model
13
A particle with no charge and a mass of 1 amu is a:
notron
neutron
proton
electron
14
According to Rutherford, electrons can reside at which point in this picture?
A, B, D
B, C
A, D
A, B, C, D
15
the energy of a photon is directly proportional to:
speed
size
frequency
wavelength
16
Bohr's theory explained which of the following?
Excited hydrogen gas gives off specific colors of light.
Electrons have negative charge.
Atoms combine to form molecules.
Most of the mass of the atom is in the nucleus.
17
Who came up with the principles of our modern atomic theory?
Bohr
Rutherford
Dalton
Aristotle
18
The atomic mass listed on the periodic table is:
the mass number
the average atomic mass
the relative atomic mass
the atomic mass
19
A certain photon of light has a wavelength of 7.50 x 10
-12
m. What is the energy?
4.97 x 10-45
2.25 x 10-3
2.65 x 10-14
4.00 x 1019
20
Changing the number of electrons in an atom changes:
the corgle
the atomic number
the isotope
the charge
21
Changing the number of protons in an atom changes:
the charge
the atomic number
the isotope
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