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Chemistry!!. March 20, 2013 Ms. Boon. Objective: I can write a nuclear reaction equation and calculate the age of a sample using radioactive decay data. Agenda: Catalyst Mouse trap reactor Radioactive decay and nuclear reactions practice Portfolio Build. Catalyst.

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Chemistry

Chemistry!!

March 20, 2013

Ms. Boon


Catalyst

Catalyst

  • In the penny lab, each trial represented one half-life. About what fraction of the pennies were removed each trial? (In other words, what does “half-life” mean?)

  • Materials: Nuclear Chemistry handouts and homework


Model mouse trap reactor

Video: calculate the age of a sample using radioactive decay data.movies file – mouse trap reactor regular and slow motion

Model: Mouse Trap Reactor

Video Focus Questions:

  • In what ways does the mouse trap reactor model simulate a nuclear chain reaction?

  • How is an actual nuclear chain reaction different from the mouse trap model?


Materials
Materials calculate the age of a sample using radioactive decay data.

  • Nuclear chemistry handouts

    • Nuclear energy article

    • Unit 11: Nuclear Chemistry – Writing Nuclear Equations

    • Nuclear chemistry work sheet

  • Homework assignments:

    • Due Next Class: Read pp. 658-666 Problems p. 666 #1, 2, 3, 5, 6, 7, 8

    • Due Next Class: Read pp. 648-657 Problems p. 670 #34, 35 p. 671 #52, 54, 58, 60, 61, 62

  • Last week: Read p. 642-643, 648-657 practice p. 653 #1-4; problems p. 657 #1, 2, 5, 6

  • Last week: Read p. 658-666 Do problems: p. 666 #4, 9, 10, p. 669 #25, 26, 27


Quick check
Quick Check: calculate the age of a sample using radioactive decay data.

  • A beta particle is a(n)

  • proton

  • Neutron

  • Electron

  • Helium nucleus


Quick check1
Quick Check: calculate the age of a sample using radioactive decay data.

  • A gamma ray can penetrate

  • Skin

  • A sheet of paper

  • A 2-cm thick piece of aluminum

  • All of the above


Sample problem nuclear equations
Sample Problem: Nuclear equations calculate the age of a sample using radioactive decay data.

p. 670 #32: When a radon-222 nuclear decays, an alpha particle is emitted. Write the nuclear equation to show what happens when a radon-222 nucleus decays.

222

Rn 86

4

He + 2

218

Po

84


Sample problem nuclear equations1
Sample Problem: Nuclear equations calculate the age of a sample using radioactive decay data.

p. 671 #47: The radiation given off by iodine-131 in the form of beta particles is used to treat cancer of the thyroid gland. Write the nuclear equation to describe the decay of an iodine-131 nucleus.

131

I 53

0

e +

-1

131

Xe

54


Sample problem radioactive dating
Sample Problem: Radioactive dating calculate the age of a sample using radioactive decay data.

p. 660 #1: Assuming a half-life of 1599 y, how many years will be needed for the decay of 15/16 of a given sample.

  • What is the question asking?

    • # years for 15/16 of a sample to undergo radioactive decay

  • How many half-lives must pass to decay 15/16 of a sample?

    • Use the half-life pattern:

      • 1 → ½ → ¼ → 1/8 → 1/16 → 1/32 → 1/64

      • This pattern shows how much of an original sample is left after each half-life.

  • For 15/16 to decay, 4 half-lives pass

    • 1599 y x 4 = 6396 y


Sample radioactive dating
Sample: Radioactive dating calculate the age of a sample using radioactive decay data.

p. 662 #1: The half-life of polonium-210 is 138.4 days. How many mg of polonium-210 remain after 415.2 days if you start with 2.0 mg of the isotope?

  • What is the question asking?

    • How much Po is left after 415.2 days

  • How many half-lives passed in 415.2 days?

    • Divide: time/half-life

      • 415.2 d/ 138.4 d = 3 half-lives

  • Use the half-life pattern to determine the fraction of the sample left over: 1 → ½ → ¼ → 1/8

  • Multiply the fraction by the original mass:

    • 1/8 x 2.0 mg = ¼ mg or 0.25 mg


Practice
Practice calculate the age of a sample using radioactive decay data.

  • Complete All Nuclear chemistry handouts

    • Nuclear energy article

    • Unit 11: Nuclear Chemistry – Writing Nuclear Equations

    • Nuclear chemistry work sheet

  • Homework assignments:

    • Due Next Class: Read pp. 658-666 Problems p. 666 #1, 2, 3, 5, 6, 7, 8

    • Due Next Class: Read pp. 648-657 Problems p. 670 #34, 35 p. 671 #52, 54, 58, 60, 61, 62

  • Last week: Read p. 642-643, 648-657 practice p. 653 #1-4; problems p. 657 #1, 2, 5, 6

  • Last week: Read p. 658-666 Do problems: p. 666 #4, 9, 10, p. 669 #25, 26, 27


Announcements
Announcements calculate the age of a sample using radioactive decay data.

  • Grades:

    • You may pick up your benchmark grade report at student led conferences.

  • Make up work:

    • Make up assignments are posted on the board.

  • Tutoring:

    • Tutoring is Friday at 3:45.

  • Worksheets and study guides:

    • Do not throw away any Semester 2 materials. You need these to study for the CST.


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