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Unit 3 The Atom Flashcards | StudBud
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Unit 3 The Atom
Unit 3 The Atom
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A Review of Atoms & Isotopes
Flashcards
29 cards
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Practice quiz
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Host live
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Questions
29
Answers
1
Which part of Dalton's Atomic Theory has been proven false?
atoms cannot be created or destroyed
All matter is made up of atoms
atoms cannot be divided
Atoms of the same element have the same properties
2
What was the gold foil experiment
Shot alpha particles at gold foil to find electrons
Shot alpha particles at gold foil to find the energy levels
Shot alpha particles at gold foil to find the nucleus
Shot alpha particles at gold foil to find the neutrons
3
What factor would be used to convert
moles
of sulfur
to
atoms of sulfur
?
1 mole S= 6.02 x 1023 atoms S
1 mole S = 32.06 atoms S
1 mole S= 16.0 atoms S
32.06 grams S= 6.02 x 1023 atoms S
4
Estimate/Calculate the atomic mass of sulfur based on the isotope info given:
33.0 amu
32.1 amu
34.0 amu
31.9 amu
5
Convert 8 grams of sulfur to moles.
128 moles S
0.50 moles S
256 moles S
0.25 moles S
6
What is the molar mass of calcium?
12.0 g
20.0 g
40.1 g
60.0 g
7
What model and who proposed this model?
plum pudding, thompson
planetary, rutherford
plum pudding, rutherford
planetary, thomson
8
Isotopes of the same element have different
numbers of neutrons
atomic numbers
numbers of electrons
numbers of protons
9
What is the molar mass of Na
2
S?
27.0 g
87.1 g
78.1 g
38.0 g
10
What factor would be used to convert 8
grams
of sulfur
to
moles of sulfur
?
1 mole S = 6.02 x 1023 grams S
1 mole S= 16.0 grams S
1 mole S = 6.02x1023 atoms S
1 mole S = 32.06 grams S
11
Which has a charge of +1?
Proton
Neutron
Electron
Atom
12
Which of these is NOT a valid conversion factor?
1 mole Ne = 20.2 g
1 mole Ne = 6.02 x 1023 grams
20.2 grams Ne = 1 mole Ne
6.02 x 1023 Ne atoms = 1 mole
13
Convert 0.5
moles S
to
atoms of S.
8 atoms S
16 atoms S
8.3 x 10-25 atoms S
3.01 x 1023 atoms S
14
What is the molar mass of MgO?
55 g/mol
20 g/mol
40 g/mol
18 g/mol
15
Which element has 14 protons?
Nitrogen
Aluminum
Sulfur
Silicon
16
Which number is the TOTAL of protons and neutrons?
27
14
40
13
17
What is the mass number?
27
40
14
13
18
The box for an element from the periodic table is shown. The atomic mass is ____, the atomic number is ____.
D, B
B, B
D, D
B, D
19
How many p
+
, e
-
, and n
0
does an atom with atomic number 50 and mass number 125 contain?
75 electrons, 50 protons, 50 neutrons
50 protons, 50 electrons, 75 neutrons
120 neutrons, 50 protons, 75 electrons
70 neutrons, 75 protons, 50 electrons
20
What did Rutherford discover?
Protons
Atoms
Nucleus
Electrons
21
How many electrons are in an neutral atom of sodium, Na?
22.99
11
12
33..99
22
JJ Thomson...
discovered the nucleus
came up with the idea of atoms
came up with the planetary model
discovered electrons are in all atoms
23
What is the mass number of the atom shown?
9
21
20
19
24
What model and who proposed this model?
plum pudding, rutherford
planetary model, rutherford
plum pudding, Bohr
planetary model, Bohr
25
What is a mole?
a small furry creature
a large number: 6.02x10-23
a large number: 6.02x1023
a number: 12
26
What is the name of the isotope?
Aluminim-14
Aluminum-27
Aluminum-13
Aluminum-40
27
Isotopes of the same element have different
mass numbers
chemical behavior
positions on the periodic table
atomic numbers
28
The sum of the protons and neutrons in an atom equals the ____.
mass number
atomic number
nucleus number
atomic mass
29
How many neutrons?
27
13
40
14
