Average Atomic Mass

Quiz
•
Chemistry
•
9th - 12th Grade
•
Medium
Standards-aligned
Bryce Dennis
Used 27+ times
FREE Resource
14 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formula to calculate average atomic mass?
Sum of (mass of isotope * relative abundance)
Sum of (mass of each isotope * relative abundance) / total number of isotopes
Sum of (relative abundance / total number of isotopes)
Sum of (mass of each isotope / total number of isotopes)
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How is the average atomic mass of an element calculated?
Sum of the masses of all naturally occurring isotopes.
Average of the masses of all naturally occurring isotopes.
Weighted average of the masses of all artificially created isotopes.
Weighted average of the masses of all naturally occurring isotopes
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is the average atomic mass of an element usually not a whole number?
Different isotopes of the element have different masses and their abundance affects the average atomic mass.
The average atomic mass is always a whole number.
The average atomic mass is rounded to the nearest whole number.
The atomic mass of an element is determined by its atomic number.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What are isotopes?
Atoms of different elements that have the same number of neutrons.
Atoms of different elements that have the same number of protons.
Atoms of the same element that have different numbers of protons.
Atoms of the same element that have different numbers of neutrons.
Tags
NGSS.HS-PS1-8
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you calculate the average atomic mass of an element with isotopes?
Add the mass of each isotope by its relative abundance and sum up the results.
Divide the mass of each isotope by its relative abundance and sum up the results.
Multiply the mass of each isotope by its relative abundance and sum up the results.
Subtract the mass of each isotope by its relative abundance and sum up the results.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the unit for average atomic mass?
grams
seconds
amu
meters
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is it important to know the average atomic mass of an element?
To determine the isotopic composition and calculate the amount of each isotope present in a sample.
To determine the melting point of the element.
To determine the boiling point of the element.
To calculate the number of valence electrons in the element.
Tags
NGSS.HS-PS1-7
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