Average Atomic Mass Re-Quiz
Quiz
•
Chemistry
•
9th Grade
•
Hard
Standards-aligned
Used 3+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
If an element has two isotopes with masses 10 amu and 12 amu, and their abundances are 25% and 75% respectively, what is the average atomic mass of the element?
13 amu
10.5 amu
11.5 amu
9 amu
2.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
If an element has three isotopes with masses 20 amu, 22 amu, and 24 amu, and their abundances are 10%, 20%, and 70% respectively, what is the average atomic mass of the element?
24.6 amu
22.4 amu
25.8 amu
23.2 amu
3.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
If an element has three isotopes with masses 30 amu, 32 amu, and 34 amu, and their abundances are 25%, 50%, and 25% respectively, what is the average atomic mass of the element?
33
35
32
31
4.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
If an element has two isotopes with masses 8 amu and 10 amu, and their abundances are 60% and 40% respectively, what is the average atomic mass of the element?
8.8 amu
10.4 amu
9.6 amu
9.2 amu
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many neutrons does the isotope below have? 89 36Kr
6.
FILL IN THE BLANK QUESTION
1 min • 1 pt
How many electrons does a 127Te2- ion have?
(ONLY write a number in the blank!)
Tags
NGSS.HS-PS1-1
7.
FILL IN THE BLANK QUESTION
1 min • 1 pt
How many electrons does a 138Ba2+ ion have?
(ONLY write a number in the blank!)
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