Semester 1 review: Average atomic mass
Authored by O'Dasha Blue
Science
10th Grade
NGSS covered
Used 1+ times
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13 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
How many neutrons would you expect the average gold atom to have given the information shown?
79
118
197
276
Tags
NGSS.MS-PS1-1
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Rubidium has two naturally occurring isotopes, 85Rb (relative mass 84.9118 amu) and 87Rb (relative mass 86.9092 amu). The abundance of 87Rb is 27.8%, If rubidium has an average atomic mass of 85.47 amu, what is the % abundance of 85Rb (in percent)?
27.9%
72.1%
74.63%
34.29%
Answer explanation
To find the % abundance of 85Rb, we can subtract the given % abundance of 87Rb (27.8%) from 100%. This gives us 100% - 27.8% = 72.1%. Therefore, the % abundance of 85Rb is 72.1%.
Tags
NGSS.HS-PS1-7
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
An element has three different isotopes. One has a mass of 35.00 amu; another has a mass of 36.00 amu; and another has a mass of 38.00 amu. What is the average atomic mass of this element?
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
An element has two naturally occurring isotopes. One is 10.013 amu and is 19.9% abundant. The other is 11.01 amu and is 80.1% abundant. What is the average atomic mass? What element is it?
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formula for calculating average atomic mass?
Sum of (mass of each isotope * relative abundance)
Sum of (mass of each isotope + relative abundance)
Sum of (mass of each isotope - relative abundance)
Sum of (mass of each isotope * relative abundance) / total number of isotopes
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
4.35% of all X atoms have a mass of 39.946 amu. 83.79% have a mass of 41.941 amu, 9.50% have a mass of 42.941 amu, and 2.36% have a mass of 43.939 amu. What is the average atomic mass of atom X?
40.04 amu
10.43 amu
42.19 amu
41.99 amu
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