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Chemistry 1 Chapter 4 Test Review Flashcards | StudBud
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Chemistry 1 Chapter 4 Test Review
The atomic number is
Which isotope has 40 neutrons?
Chemistry 1 Chapter 4 Test Review
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#chemistry #atomictheory #subatomic
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Answers
1
Which isotope has 40 neutrons?
None of them
Selenium - 74
Zirconium - 91
Calcium - 40
2
The atomic number is
Neither is correct.
Both are correct.
is always a whole number.
a weighted average of the masses of each isotope.
3
Atoms are electrically neutral because
The # of protons = the # of neutrons.
Protons, neutrons, and electrons are all equal.
The # of protons equal the # of electrons.
The # of electrons = the # of neutrons.
4
What two particles make up the nucleus of the atom?
Proton and neutron
Protons, neutrons, and electrons
Neutron and electron
Proton and electron
5
Which type of radiation has the same components as a helium nucleus (2 protons and 2 neutrons)?
Gamma ray
Beta particle
Alpha particle
6
The 2 men most
alike
in their ideas about atoms were
Aristotle and Dalton
Dalton and Democritus
Aristotle and Democritus
7
Which of these was a major difference between Dalton and Democritus?
Dalton performed experiments; Democritus didn't.
Democritus thought new atoms could be created; Dalton didn't
Dalton-all atoms were identical; Democritus-each was unique.
Dalton believed in p+, n0, and e-; Democritus didn't.
8
A reaction that involves a change in an atom's nucleus is called a
Nuclear reaction
Protonic reaction
Physical reaction
Chemical reaction
9
This scientist from New Zealand discovered the nucleus.
John Dalton
Ernest Rutherford
Niels Bohr
J.J. Thomson
10
The mass number of an isotope is
The number of neutrons an isotope has
= to the average atomic mass found on the periodic table
The sum of the p+ and n0 in the nucleus of an isotope
Equal to the number of electrons an isotope has
11
The scientist from America who discovered the exact charge of an electron was
J.J. Thomson
Robert Milikan
Louis DeBroglie
Niels Bohr
12
Which of the following is
incorrect
?
The proton has a relative mass of 1.
The proton has no charge.
The electron is found outside the nucleus.
The neutron is found in the nucleus.
13
J.J. Thomson was able to determine the exact mass and charge of the electron.
True
False
14
Rutherford used ______ in his experimentation.
No equipment
An alpha particle generator
A mass spectrometer
A cathode ray tube
15
Mass Number - Atomic Number =
# of protons
# of electrons
# of neutrons
None of these
16
This Greek philosopher first proposed the concept of the atom.
Aristotle
John Dalton
Copernicus
Democritus
17
Isotopes of an element have different
Chemical properties
Numbers of electrons
Atomic numbers
Mass numbers
18
Isotopes of an element have different numbers of
Protons
Electrons
Neutrons
19
What did Ernest Rutherford expect to happen during the gold foil experiment?
All of the alpha particles would bounce off the gold foil
None of the alpha particles would pass through the gold foil
All of the alpha particles would pass through the gold foil
He did not make a prediction.
20
Atoms are radioactive because
They become unstable.
Both are correct.
Neither is correct.
The n0-p+ ratio is too high.
21
Nearly all of an atom's mass is due to the ___. Nearly all of its volume comes from the ___.
Electron cloud / nucleus
Electron cloud / electron cloud
Nucleus / nucleus
Nucleus / electron cloud
22
The smallest particle of an element that retains the properties of the element is
Isotope
Atom
Proton
Neutron
23
Sir James Chadwick discovered
The nucleus
The neutron
The proton
The electron
24
Which particle is needed to balance this nuclear equation?
226
88
Ra -->
222
86
Rn + _____
42He
00γ
0-1β
25
Which of the following was not a part of Dalton's atomic theory? Atoms
are separated, combined, or rearranged during a reaction.
of the same element are identical.
compose all matter.
can be chemically bonded in any proportion-whole or fraction
26
The process by which an unstable nucleus loses mass and energy spontaneously is
Chemical decay
Physical change
Chemical change
Radioactive decay
27
Which of these particles is the smallest?
Atom
Neutron
Proton
Electron
28
After the discovery of the electron, a new model of the atom was created called the
Quantum Mechanical Model
Nuclear Model
Planetary Model
Plum Pudding Model
29
Which of these statements about Democritus is true? He thought...
atoms could not be created or destroyed.
atoms were made up of smaller parts.
the same thing about atoms as other Greeks of his time.
matter could be divided into smaller and smaller pieces.
30
How many neutrons does
55
25
Mn have?
25
54.94
30
55
31
What element has the atomic number 9?
B
Fe
Be
F
32
The electron was discovered through an experiment using
Gold foil and alpha particles
A cathode ray tube
Mass spectrometer
Beryllium and polonium
33
If you change the number of ____ in an atom, you will make it a different element.
Protons
Electrons
Neutrons
34
What is the mass number of the following isotope?
116
77
270
193
35
In carbon-14, the 14 is the
Number of neutrons
Number of protons
Atomic number
Mass number
36
Which type of radiation has no mass?
Beta particle
Gamma ray
Alpha particle
37
Which of the following statements is
correct
?
Protons and neutrons make up the nucleus.
The nucleus of the atom Is negatively charged.
The neutron has about the same mass as the electron.
Atoms normally have either a positive or negative charge.
38
The overall charge of an atom is
Positive
Neutral
Negative
39
The atomic number of an element is
the number of reactions that element can undergo.
the number of isotopes the element has.
the number of neutrons in an atom of the element.
the number of protons in an atom of that element.
40
Why did Rutherford think the nucleus had to be very small?
Because the plum pudding model predicted it
It couldn't be seen with a microscope
Most of the alpha particles missed the nucleus in gold foil
It made the alpha particles bounce off.
41
Which subatomic particle determines the
chemical behavior
of an element?
Protons
Electrons
Neutrons
42
This British scientist discovered the electron.
J.J. Thomson
James Chadwick
Ernest Rutherford
John Dalton
43
Which particle is needed to balance this nuclear equation?
236
92
U --> ____ +
0
-1
β
42He
23693U
23693Np
44
The average atomic mass of an element
is found by taking a weighted average of all isotopes
Both are correct
Can be calculated with the mass and % abundance
Neither are correct
45
Which isotope was chosen as the standard for the atomic mass unit?
Carbon - 12
Oxygen - 16
Hydrogen - 1
Gold - 197
46
Which type of radiation would not be deflected by a positively or negatively charged plate?
Beta particle
Gamma ray
Alpha particle
47
Average atomic mass of carbon is 12.011. Which isotope is most likely the most abundant?
Carbon - 12
Carbon - 11
Carbon - 13
Carbon - 14
48
Beta particles
have no charge.
have a charge of -1.
have a charge of +2.
can only be stopped by several inches of steel or concrete.
49
The charge of an electron is
Negative
Positive
Neutral
50
The atom is the smallest known particle of matter.
True
False
51
Calculate the average atomic mass of an element that is 51.84% 106.91amu and 48.16% 108.90 amu.
107.86 amu
AAM cannot be calculated with this information.
107 amu
107.87 amu
52
The proton was the first subatomic particle to be discovered.
False
True
53
According the the Plum Pudding Model, what makes up most of the atom?
Electrons
A positive substance or cloud
The Nucleus
Empty Space
