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Mastery Quiz
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1

Much of the evidence for the existence of atoms comes from
A)chemistry
B)mechanics
C)biology
D)thermodynamics
2

The discovery of the conservation of mass in chemical reactions was made by
A)Bohr
B)Heisenberg
C)Lavoisier
D)Newton
E)Rutherford
3

Molecules are
A)subdivisions of atoms
B)several atoms bound together
C)the same as electrons
D)the same as nuclei
4

The arrangement of the elements according to their chemical properties and atomic weight is called the .
5

Alpha particles
A)have no charge
B)are the same as electrons
C)are the same as helium ions
6

Beta particles
A)have no charge
B)are the same as electrons
C)are the same as helium ions
7

Photons are
A)positively charge
B)negatively charge
C)uncharged, particle-like bundles of energy
8

The relationship between energy and frequency for an electromagnetic wave proposed by Planck and Einstein is
A)E = h/f
B)E = h f
C)E = f/h
D)E = h f2
9

The Bohr model of the atom states
A)electrons can have any orbit about the nucleus
B)electrons are contained in the nucleus
C)electrons are uniformly distributed throughout the atom
D)electrons can orbit the nucleus only in certain stable orbits
10

The De Broglie wavelength of a particle is calculated from the momentum as
A)λ = h/p
B)λ = p/h
C)λ = hp
D)λ = hp2





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