Unit 2 Lesson 7 Practice: Half Life Calculations

Quiz

•

Chemistry

•

10th Grade

•

Medium

•

NGSS.HS-PS1-8, CCSS.HSF.LE.A.4, NGSS.HS-PS1-1

Standards-aligned

Ryan McCluskey

Used 98+ times

FREE Resource

20 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is Half-life?

The amount of time it takes for some of the nuclei in a sample of the isotope to decay

The amount of time it takes for half the electrons in a sample of the isotope to decay

The amount of time it takes for half the nuclei in a sample of the isotope to decay

the amount of time it takes to double the nuclei in a sample of the isotope to decay

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?

100.0g

50.0g

12.5g

8.5g

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?

0.25g

2.5g

25g

80g

Tags

CCSS.HSF.LE.A.4

4.

FILL IN THE BLANK 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

Tags

NGSS.HS-PS1-8

5.

FILL IN THE BLANK 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

Tags

NGSS.HS-PS1-8

6.

FILL IN THE BLANK 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

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 M_i)

100.0g

50.0g

12.5g

8.5g

Tags

NGSS.HS-PS1-8

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