What does Potassium-40 mean?

Potassium with a mass number of 40

The mass number of an atom is found by

adding the number of protons to the number of neutrons

What does Uranium-235 mean?

Uranium with a mass number of 235

Rutherford's "gold foil" experiment proved that

protons are in the nucleus of an atom

Which of the following was NOT part of Dalton's Atomic Theory?

Isotopes have different numbers of neutrons.

How can the number of neutrons for an atom be found?

by subtracting the atomic number from the mass number

The two isotopes of Boron are Boron-10 and Boron-11. Boron's mass on the Periodic Table is 10.811. This means that

There is more Boron-11 than Boron-10

of the same element with different numbers of neutrons

positively charged and in the nucleus

negatively charged and surrounding the nucleus

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Chemistry: Chapter 4 (Pearson)

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A #Chemistry Quiz.

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Questions 25

Answers

1
Who first used the term "atom?"
John Dalton
Democritus
Ernest Rutherford
J. J. Thomson
2
What does Potassium-40 mean?
Potassium with an atomic number of 40
Potassium with 40 neutrons
Potassium with 40 protons
Potassium with a mass number of 40
3
How many protons are in a atom of Phosphorus?
15
7
31
16
4
The mass number of an atom is found by
adding the number of neutrons to the number of electrons
doubling the number of protons
subtracting the atomic number from the number of electrons
adding the number of protons to the number of neutrons
5
Who discovered neutrons in 1932?
James Chadwick
J. J. Thomson
John Dalton
Ernest Rutherford
6
What does Uranium-235 mean?
Uranium with 235 neutrons
Uranium with a mass number of 235
Uranium with 235 electrons
Uranium with an atomic number of 235
7
Who performed the "oil drop" experiment?
J. J. Thomson
Ernest Rutherford
Robert Millikan
John Dalton
8
Rutherford's "gold foil" experiment proved that
neutrons exist
protons are in the nucleus of an atom
neutrons are negatively charged
electrons are positively charged
9
Why do most of the mass numbers on the periodic table have a decimal amount?
because we aren't sure of the actual masses
because they are averages
because some atoms don't have electrons
because some atoms have more protons
10
Which of the following was NOT part of Dalton's Atomic Theory?
Atoms cannot be subdivided, created, or destroyed.
Atoms of a given element are identical.
Isotopes have different numbers of neutrons.
All matter is composed of tiny particles called atoms.
11
How many neutrons are in an atom of Silicon-28?
14
21
28
13
12
How can the number of neutrons for an atom be found?
It is equal to the number of protons
It is equal to the number of electrons
by adding the protons and electrons
by subtracting the atomic number from the mass number
13
Isotopes
will have different atomic numbers.
have different atomic number and masses.
will have different numbers of electrons.
will have different masses.
14
The two isotopes of Boron are Boron-10 and Boron-11. Boron's mass on the Periodic Table is 10.811. This means that
Only Boron-11 exists
Boron-10 does not actually exist
There is more Boron-10 than Boron-11
There is more Boron-11 than Boron-10
15
What law says that a compound contains the same elements in exactly the same proportions?
Law of Multiple Proportions
Law of Conservation of Energy
Law of Conservation of Mass
Law of Definite Proportions
16
How many electrons are in a normal atom of Sodium?
23
16
12
11
17
Isotopes are atoms
of different elements with the same number of electrons
with special types of protons
of the same element with different numbers of neutrons
of different elements with different atomic numbers
18
Protons are
positively charged and in the nucleus
negatively charged and surrounding the nucleus
neutral and in the nucleus
neutral and surrounding the nucleus
19
Who performed the "gold foil" experiment?
Robert Millikan
Ernest Rutherford
John Dalton
J. J. Thomson
20
Who is considered to be the "Father of Chemistry?"
Ernest Rutherford
John Dalton
Amodeo Avogadro
Democritus
21
Experiments in the late 1800's with "Cathode Rays" led to the discovery of
protons
neutrons
atoms
electrons
22
Whose experiments measured the charge-to-mass ratio of an electron?
Robert Millikan
John Dalton
J. J. Thomson
Ernest Rutherford
23
How many neutrons are in an atom of Argon-40?
40
12
22
18
24
Electrons are
neutral and in the nucleus
positively charged and surrounding the nucleus
negatively charged and surrounding the nucleus
neutral and surrounding the nucleus
25
How many protons are in an atom of Aluminum?
27
19
13
14

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