What are the two main objectives of the lesson?

Calculating Weighted Average Atomic Mass

Interactive Video
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Chemistry
•
6th - 10th Grade
•
Medium

Emma Peterson
Used 1+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
To describe atomic mass unit and determine the weighted average atomic mass
To describe atomic mass unit and calculate molecular mass
To determine molecular mass and calculate isotopic abundance
To describe isotopic abundance and calculate molecular mass
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why can't you simply average the masses of isotopes to find the average atomic mass?
Because isotopes have different chemical properties
Because the abundance of each isotope must be considered
Because isotopes have different charges
Because isotopes have different physical states
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the classroom analogy, why is it incorrect to average the ages of the students and the teacher directly?
Because the ages are not whole numbers
Because the ages are not in the same range
Because the teacher's age is not relevant
Because there are more students than the teacher
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How do you calculate the average age of a classroom with different numbers of students in each age group?
By multiplying the age of each group by the number of students in that group, summing these products, and dividing by the total number of students
By averaging the ages of the students and the teacher
By adding the ages and dividing by the number of age groups
By taking the median age of the students
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the simplified equation for calculating the average atomic mass?
Sum of the product of the percentage and mass of each isotope divided by the number of isotopes
Sum of the product of the percentage and mass of each isotope divided by 100
Sum of the masses of all isotopes
Sum of the percentages of all isotopes
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why can't individual atoms be counted to determine their average mass?
Because atoms are too small to be counted individually
Because atoms are always in motion
Because atoms are not visible
Because atoms have different charges
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Given that 99.6% of nitrogen is nitrogen-14 and 0.4% is nitrogen-15, what is the average atomic mass of nitrogen?
14.07 amu
14.00 amu
15.00 amu
15.07 amu
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