Half-life Review

Presentation

•

Chemistry

•

10th - 12th Grade

•

Practice Problem

•

Medium

•

NGSS

HS-PS1-8

Standards-aligned

Lois Lindo

Used 98+ times

FREE Resource

3 Slides • 8 Questions

Half-life Review

What is half-life and how is it calculated?

Half-life

It is the time taken for a radioactive isotope to decay to half its original value.
Time can be seconds, minutes, hours, weeks, months or years
It varies depending on the isotope

Fill in the Blanks

Type answer...

Multiple Choice

What is an isotope?

one of several forms of the same atoms; same number of protons but have different number of neutrons

a particle that has no charge and is located in the nucleus of an atom.

energy in the form of waves or particles that is emitted from an object and travels through space or air

Multiple Choice

Geologist use the time it takes for a radioactive isotope to decay to half its original mass called a___________.

radioactive decay

isotope

half-life

carbon dating

Multiple Choice

What is the only difference between two different isotopes of the same element?

Number of neutrons

Number of protons

Number of electrons

Size of atom

Half-life

Radon-222 decays with a half-life of 3.82 days. If an initial sample of the element contains 1000 atoms, how much remains after 15.28 days?

Half-life = 3.82 days

# of half-lives = 15.28/3.82 = 4

1000--> 500 --> 250-->125-->62.5 atoms

62.5 atoms remains after 4 half-lives.

Multiple Select

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?

What do we need to know to answer this question? (Check all that applies)

the half-life for the given sample

the number of half-lives passed based on the total time

to multiply by 2

if alpha decay occurs

Multiple Choice

If 20 mg of iodine-131 is given to a patient, how much is left after 32 days? The half-life of iodine-131 is 8 days.

1.25

2.5

Multiple Choice

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

Multiple Choice

You have 100 grams of radioactive C-14. The half life of C-14 is 5730 years.

How many grams are left after 1 half life?

100g

50g

25g

Half-life Review

What is half-life and how is it calculated?

Show answer

Auto Play

Slide 1 / 11

SLIDE

Similar Resources on Wayground

9 questions

Bohr Model and EM Spectrum

Presentation

•

10th - 12th Grade

10 questions

Estructura 4.2: stem changing verbs

Presentation

•

10th - 12th Grade

10 questions

The environment

Presentation

•

10th - 12th Grade

10 questions

Karyotypes

Presentation

•

9th - 12th Grade

10 questions

Adobe Photoshop Shortcut Keys

Presentation

•

9th - 12th Grade

11 questions

Logarithms to Exponential

Presentation

•

10th - 12th Grade

10 questions

Computer Network

Presentation

•

9th - 12th Grade

8 questions

9.6 Ideal Gas Law

Presentation

•

10th - 12th Grade

Popular Resources on Wayground

24 questions

PBIS-HGMS Day 10

Quiz

•

6th - 8th Grade

10 questions

HCS SCI 03 Summer School Review 3

Quiz

•

3rd Grade

11 questions

Home Scope

Quiz

•

7th - 8th Grade

15 questions

HCS SCI 05 Summer School Assessment 3 Review

Quiz

•

5th Grade

35 questions

Lufkin Road Middle School Student Handbook & Policies Assessment

Quiz

•

7th Grade

18 questions

Geo 11.3 Area of Circles and Sectors

Quiz

•

9th - 11th Grade

Discover more resources for Chemistry

18 questions

Geo 11.3 Area of Circles and Sectors

Quiz

•

9th - 11th Grade