Half Life Notes

Presentation

•

Chemistry

•

10th Grade

•

Medium

•

NGSS

HS-PS1-8

Standards-aligned

Matthew Koch

Used 12+ times

FREE Resource

5 Slides • 11 Questions

Multiple Choice

_______________ is the process by which unstable atoms emit radiation until they become stable.

Radiation

Chemical Reaction

Radioactive Decay

Isotopes

Multiple Choice

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

Multiple Choice

The Half Life of Californium 252 is 5 years.

TRUE

FALSE

Multiple Choice

What is the Half Life of this isotope?

3 days

5 days

8 days

10 days

Multiple Choice

What is the half life of californium?

1 year

2.8 years

3 years

5 years

Multiple Choice

If the half life of a radioactive element is 100yrs, how long would it take for the radioactivity to reduce by one half?

200yrs

100yrs

50yrs

300yrs

Multiple Choice

A certain radioactive sample has a half life of 2 years. After 6 years, how much of the sample is left?

1/2

1/3

1/16

1/8

Multiple Choice

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 2.4 minutes has elapsed?

100.0g

50.0g

12.5g

8.5g

Multiple Choice

After the third half-life, how much of the sample is left?

1/2

1/3

1/16

1/8

Multiple Choice

If 10 mg of iodine 131 is given to a patient, how much is left after 8 days? The half-life of iodine-131 is 8 days.

5.0mg

1.25g

10g

10mg

Multiple Choice

What is the half-life of iodine-131?

32 days

8 days

16 days

24 days

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