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Ch. 3 Atomic Structure & Ch. 21 Nuclear Chemistry 2017-2018 Flashcards | StudBud
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Ch. 3 Atomic Structure & Ch. 21 Nuclear Chemistry 2017-2018
Ch. 3 Atomic Structure & Ch. 21 Nuclear Chemistry 2017-2018
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The is a review for atomic structure and nuclear chemistry.
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26 cards
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Questions
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Answers
1
In the nuclear equation... Th-232 --> Ra-228 + X represents
an alpha particle
a gamma ray
a beta particle
a neutron
2
Describe the current atomic theory.
a neutral nucleus with electrons orbiting in set paths
a negative nucleus surrounded by a proton cloud
a neutral nucleus with neutrons orbiting in set paths
a positive nucleus surrounded by an electron cloud
3
According to the law of definite proportions, any 2 samples of H
2
O have
different molecular structures
the same ratio of elements
the same number of molecules
a different ratio of elements
4
Which correctly describes an isotope with 8 protons, 8 electrons, and 8 neutrons?
Oxygen - 16
Oxygen - 24
Sulfur - 24
Beryllium - 8
5
How many significant figures: 0.012900
5
3
4
6
6
High energy is a requirement for fusion to occur because the nuclei involved
repel each other with unlike charge
repel each other with like charges
attract each other with unlike charges
attract each other with like charges
7
An atom's stability is based on its ratio of
protons to electrons
neutrons to protons
electrons to neutrons
beta to alpha
8
Thompson's discovery of the electron changed which part of Dalton's Atomic Theory below?
4
3
1
2
9
How does the process of fission start?
A neutron is emitted from the heavy nucleus
A proton escapes the strong nuclear force
Three neutrons bombard the nucleus
A neutron bombards the nucleus
10
What is the correct equation when Pa-238 goes through beta emission?
Pa-238 --> He-4 + Ac-234
Pa-238 + e- --> Th-238
Pa-238 --> e- + U-238
Pa-238 + He-4 --> Np-242
11
Because of their instability, all nuclei with an atomic number greater than ___ are radioactive
12
50
83
100
12
The combined mass of the separate particles is ____ than the accepted mass of a given atom.
The same as
None of the above, it depends on the atom.
Less
More
13
The intermediate mass elements have ___ nuclear binding energy?
the greatest
the least
an intermediate amount of
no
14
Nuclear binding energy is released when a nucleus is formed from nucleons.
False
True
15
The number of ______ determines what nuclide you have.
neutrons
atoms
protons
protons & electrons
16
When the number of protons changes...
you have a different element
you have a different isotope of the same element
you have a larger mass of the same element
you end up with two elements
17
What conversion(s) would you need to go from mass (grams) to number of particles?
Avogadro's number
atomic mass AND molar mass
molar mass
molar mass AND Avogadro's number
18
During positron emission, a ____ is changed into a(n) ____.
neutron, electron
proton, electron
proton, neutron
neutron, proton
19
Compound X
2
Y
2
has twice the mass of elements X & Y, compared to compound XY as stated by
Modern Atomic Theory
The Law of Multiple Proportions
The Law of Definite Proportions
The Law of Conservation of Mass
20
When do you use significant figures during an average atomic mass problem?
After each step
You don't have to use them! :)
Only during the multiplication steps
Only at the end
21
What is the order of radioactive particle penetrating ability from least to greatest?
Trick! They all have the same ability
gamma < alpha < beta
alpha < beta < gamma
gamma < beta < alpha
22
Using the table below, how much of the sample remains after 100 days?
1.5625 g
12.5 g
3.125 g
6.25 g
23
Molar mass is equal to the average atomic mass for a given element.
True
False
24
What is true about an atom with a mass number of 45 and an atomic number of 21?
it has an unequal number of protons and electrons
it has 45 neutrons
it has 24 protons
it has an unequal number of protons and neutrons
25
Which atom is the standard for determining atomic mass & moles?
C-11 Atom
C-12 Atom
H-2 Atom
H-3 Atom
26
What are the main conclusions Rutherford made from his Gold Foil experiment?
atoms are mostly dense with a large negative nucleus
atoms are solid, neutral spheres that are indivisible
atoms are mostly empty space with a small, positive nucleus
atoms are mostly positive with negative electrons scattered
