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Atomic Theory & Avogadro's Number Flashcards | StudBud
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Atomic Theory & Avogadro's Number
Atomic Theory & Avogadro's Number
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Atomic Theory & Avogadro's Number
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1
An important result of Rutherford’s experiments with gold foil was to establish that
atoms have mass
electrons have a negative charge
neutrons are uncharged particles
the atom is mostly empty space
2
How many neutrons are in an atom of tin (atomic number of 50 & a mass number of 119)?
50
169
69
119
3
What is the mass of 1.50 mol of sodium, Na
0.478 g
11.0 g
0.652 g
34.5 g
4
Cathode rays are composed of
neutrons
protons
electrons
alpha particles
5
The atomic number of an element is the same as the number of
protons + neutrons
protons
neutrons
protons + electrons
6
Which atom has more neutrons, potassium-40 or argon-40?
potassium-40
argon-40
7
How many moles of carbon are in a 28.0 g sample
72.0 mol
336 mol
2.33 mol
0.500 mol
8
Chemical compound have the same elements in the same proportions by mass regardless source
is the law of conservation of mass
is the law of definite proportions
is the Law of multiple proportions
is the law of isotopes
9
Which particle has the least mass?
All have the same mass
proton
neutron
electron
10
Which subatomic particle has a charge of +1?
megatron
neutron
proton
electron
11
What is the mass of 1.20 x 10^23 atoms of phosphorus
190 g
6.17 x 10^23 g
6.17 g
7.22 g
