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Question 1 (1 point) Question 1 Unsaved
Orbitals are defined by which of the following?
Question 1 options:
number of electrons
spin direction
energy level
composition
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Question 2 (1 point) Question 2 Unsaved
An atom has 14 protons and 14 neutrons. What is the chemical symbol for the atom? Consult the periodic table.
Question 2 options:
Al
Cr
Mg
Si
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Question 3 (1 point) Question 3 Unsaved
An atom has an average atomic mass of about 63.5 amu. What is the chemical symbol for the atom? Consult the periodic table.
Question 3 options:
Pb
Cu
Eu
Fe
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Question 4 (1 point) Question 4 Unsaved
An atom has a charge of –3 in its orbitals. Which statement must be true in order for this atom to have no net charge?
Question 4 options:
There are three neutral neutrons in the nucleus.
There are three positively charged protons in the nucleus.
There are two positively charged protons in the nucleus and one in an orbital.
There are three positively charged protons outside the nucleus.
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Question 5 (1 point) Question 5 Unsaved
The number of protons in the nucleus of an atom is equivalent to which of the following?
Question 5 options:
mass number
atomic weight
atomic number
number of neutrons
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Question 6 (1 point) Question 6 Unsaved
You heat two substances, A and B. Both substances change color. When cooled, substance A returns to its original color, but substance B does not. What most likely happened?
Question 6 options:
A chemical change occurred in both substances.
A chemical change occurred in substance A, and a physical change occurred in substance B.
A physical change occurred in both substances.
A physical change occurred in substance A, and a chemical change occurred in substance B.
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Question 7 (1 point) Question 7 Unsaved
A material has a density of 8.9 g/cm3. You have six cubic centimeters of the substance. What is the material's mass in grams?
Question 7 options:
5.9 g
107 g
3.0 g
53 g
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Question 8 (1 point) Question 8 Unsaved
Which of the following describes an element?
Question 8 options:
C2H6
H2O2
CuSO4
CI2
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Question 9 (1 point) Question 9 Unsaved
Which of the following goes on the x-axis of a graph?
Question 9 options:
trend line
independent variable values
graph title
dependent variable values
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Question 10 (1 point) Question 10 Unsaved
A container has the dimensions of 30 cm x 50 mm x 0.2 m. The density of its contents is 2.5 g/cm 3. What is the mass of the substance in kilograms? ( D = m/V)
Question 10 options:
150 kg
75 kg
0.75 kg
7.5 kg
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