
4.5: Average Atomic Mass
Quiz
•
Chemistry
•
9th Grade
•
Medium
Standards-aligned
L Turk
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8 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
An imaginary element has three naturally-occurring isotopes. 80% of the isotopes have a mass of 3 amu, 15% have a mass of 4 amu, and 5% have a mass of 5 amu. The average atomic mass of this imaginary element will be closest to
3 amu
4 amu
5 amu
12 amu
2.
MULTIPLE CHOICE QUESTION
45 sec • 5 pts
The atomic mass of an element is the ___.
average of the mass number and the atomic number for the element
weighted average of the masses of the isotopes of the element
total mass of the isotopes of the element
total number of subatomic particles in the nucleus
3.
MULTIPLE CHOICE QUESTION
45 sec • 5 pts
Chlorine has two naturally occurring isotopes, chlorine-35 and chlorine-37, The atomic mass of chlorine is 35.45. Which of these two isotopes of chlorine is more abundant?
chlorine-35
chlorine-37
Cannot be determined from the information provided.
4.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
The image shows a square from the periodic table. What does the number at the very bottom of the square tell you?
atomic number
average atomic mass
mass number
number of neutrons
Tags
NGSS.HS-PS1-1
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the unit we use for average atomic mass?
amu
g
g/mol
g/mL
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calcium has three different isotopes. One has a mass of 35 amu; another has a mass of 41 amu; and another has a mass of 40 amu. Based on calcium's average atomic mass (from the periodic table), which isotope of calcium is probably the most abundant?
35 amu
40 amu
41 amu
impossible to tell
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A hypothetical element has 3 naturally-occurring isotopes, as shown in the chart. Calculate this element's average atomic mass.
57.2 amu
84.5 amu
60.0 amu
56.7 amu
Tags
NGSS.HS-PS1-7
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