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PS Ch 4
Test Description: Atomic Theory
Instructions: Answer all questions to get your test result.
1) Dalton's atomic Theory was accepted because
A
there was evidence to support it
B
Deomcritus said it was correct
C
Salton showed how molecules are formed
D
Dalton invented the electron microscope
2) Atoms have no electric charge because they
A
have neutrons in their nuclei
B
have an equal number of electrons and protons
C
have an equal number of charged and non charged aprticles
D
have an equal number of neutrons and protons
3) According to the new model of the atom,electrons behavelie
A
waves vibrating on a string
B
planets orbiting the sun
C
light energy in a vacuum
D
planets rotating on their axis
4) According to modern atomic theory,it is nearly impossible to determine an electron's exact
A
mass
B
charge
C
position
D
color
5) Valence electrons determine an atoms
A
mass
B
period
C
chemical properties
D
electric charge
6) A mole is an SI base unit that describes the
A
volume of a substance
B
amount of a substance
C
mass of a substance
D
electric charge of a substance
7) If the atomic mass of carbon is 12 u, 1 mole of pure carbon will have a mass of
A
12 mol
B
6 g
C
12 g
D
6 mol
8) You have 85.5 g of fluorine which has a molar mass of approximately 19 g/mol. How many moles of fluorine do you have
A
4.5 mol
B
85 mol
C
19 mol
D
45 mol
9) Democitus's original atomic theory was revised because it
A
did not have a scientific basis
B
claimed atoms could be divided
C
explained what electrons were
D
claimed matter is made of atoms
10) Which of these statements is NOT part of Dalton's atomic theory?
A
Atoms of an element are alike
B
Atoms are made of electrons
C
Atoms of different element from compounds
D
Atoms cannot be divided
*select an answer for all questions
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