Half Life Calculations Practice
Authored by Charles Martinez
Chemistry
10th Grade
NGSS covered
Used 12+ times
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20 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is Half-life?
Tags
NGSS.HS-PS1-8
2.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?
Tags
NGSS.HS-PS1-8
3.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Barium-122 has a half-life of 2 minutes. A fresh sample weighing 80 g was obtained. If it takes 10 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?
Tags
NGSS.HS-PS1-8
4.
FILL IN THE BLANKS QUESTION
1 min • 1 pt
If the half life of iodine 131 is 8 days, how many half lifes have occured after 24 days? NO UNITS
(a)
Tags
NGSS.HS-PS1-8
5.
FILL IN THE BLANKS QUESTION
1 min • 1 pt
If 10 mg of iodine 131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days. Round to two decimal points. NO UNITS NEEDED
(a)
Tags
NGSS.HS-PS1-8
6.
FILL IN THE BLANKS QUESTION
1 min • 1 pt
The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g? Round to two decimal points. NO UNITS
(a)
Tags
NGSS.HS-PS1-8
7.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
The half-life of Zn-71 is 2.4 minutes. If 6.25 g of Zn-71 are needed for an experiment, how much should be prepared if it will take 9.6 minutes before the experiment can begin? (FIND Mi)
100.0g
50.0g
12.5g
8.5g
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