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Physical Science Chapter 4 Review Flashcards | StudBud
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Physical Science Chapter 4 Review
Physical Science Chapter 4 Review
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1
You have 6.50 mol of chromium, which has a molar mass of ~ 52 g/mol. What is the mass in grams of this amount?
338 g
33.8 g
3.38 g
3.38 g
2
Which statement about an element's average atomic mass is correct?
Is determined by counting the number of isotopes in a sample of the element
Weighted average, so common isotopes have a greater effect than uncommon
Is based on an isotope's charge, so negative have greater effect than +
It is equal to one-twelfth the mass of the most common isotope
3
The order of elements in the periodic table is based on
the electric charge of the nucleus
atomic mass
the number of neutrons in the nucleus
the number of protons in the nucleus
4
The average atomic mass of potassium is approximately 39 amu. What is the mass of 2.0 mole of Potassium?
78 g
0.78 g
39 g
0.39 g
5
The order of elements in the periodic table is based on the number of ____ in the nucleus
electrons
neutrons
protons
protons and neutrons
6
The nucleus of an atom has a(n) ______ electric charge
positive
neutral
negative
7
Oxygen's atomic number is 8. This means that an oxygen atom has
a total of eight neutrons and electrons
a total of eight protons and eight neutrons
eight neutrons in its nucleus
eight protons in its nucleus
8
Which statement about the atomic nucleus is correct?
The nucleus is made of electrons and has a positive charge.
The nucleus is made of protons and neutrons and has a positive charge.
The nucleus is made of protons and neutrons and has a negative charge.
The nucleus is made of electrons and has a negative charge.
9
Group 18 noble gases are inert because
their outermost energy level is missing one electron
they cn have either a + or - charge
their outermost energy level is full
they readily form positive ions
10
According to Bohr's model of the atom, electrons behave like
waves on a vibrating string
light energy in a vacuum
planets rotating on their axes
planets orbiting the sun
11
The ____ are located in the center of the periodic table.
Halogens
transition metals
nonmetals
Noble gases
12
The ______ is the SI unit that is used for counting small particles, such as atoms.
gram
mole
Group
proton
13
If the atomic mass of carbon is 12 amu, 1 mole of pure carbon will have a mass of
12g
6 mol
6g
12 mol
14
The word atom comes from the Greek word that means "unable to be divided"
False
True
15
Bohr's model of the atom compares electrons to
planets
plum pudding
clouds
16
Noble gases are nonreactive gaseous elements that are located in group ____ of the periodic table
17
18
1
8
17
Dalton's atomic theory stated that every element was made of atoms that could not be subdivided and
the nucleus is the center of the atom
atoms can join to form molecules
atoms are made of protons, neutrons, and electrons
atoms are constantly in motion
18
Some elements are highly ___ because their outermost energy levels are only partially filled.
empty
colorful
reactive
negative
19
The molar mass of krypton is 83.80g/mol. The mass of 5.00 mol of krypton is
419 g
419 mol
41.9 g
41.9 mol
20
A mole is an SI base unit that describes
mass of a substance
volume of a substance
amount of a substance
electric charge of a substance
21
Isotopes of an element have the same atomic ____ but different atomic ____
number, masses
mass, proton
mass, number
number, shape
22
Ionization refers to the process of
losing or gaining protons
changing from one period to another
losing or gaining electrons
turning lithium into fluorine
