
Atomic Mass Calculation Quiz

Interactive Video
•
Chemistry
•
9th - 10th Grade
•
Hard
Jennifer Brown
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the main challenge in calculating atomic mass without using percentages?
Understanding the concept of isotopes
Using algebra to solve for variables
Identifying the number of isotopes
Memorizing atomic masses
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What assumption allows us to use only one variable in the equation?
The atomic mass is always given
The total abundance of isotopes is 100%
The isotopes have equal mass
The isotopes are chemically identical
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why do we convert percentages to decimals in the equation?
To match the units of atomic mass
To simplify the calculation
To avoid using fractions
To make the equation more complex
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step in setting up the algebraic equation for this problem?
Calculating the average atomic mass
Finding the mass of each isotope
Assigning variables to isotopes
Determining the number of isotopes
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do we express the relationship between the two isotopes' abundances?
X - Y = 1
X * Y = 1
X + Y = 1
X + Y = 0
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the next step after substituting Y with 1 - X in the equation?
Convert decimals back to percentages
Solve for Y
Add the atomic masses
Distribute and simplify the equation
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the percent abundance of chlorine-35 after solving the equation?
50%
24.59%
75.41%
100%
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