How does a smoke detector work? Theme: Stability and Change A review of what we’ve learned about the nucleus so far!

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Presentation transcript:

How does a smoke detector work? Theme: Stability and Change A review of what we’ve learned about the nucleus so far!

Material for a smoke detector: Americanium-241 – Is a decay product of Pu-241 – What type of decay would that be? – Write a balanced nuclear equation! Where does radioactive plutonium come from?

What type of decay does Am-241 undergo? Alpha and gamma: – Write a balanced nuclear equation: Discuss in terms of conservation of energy and matter!

What do alpha particles do? Ionize nitrogen and oxygen in air. This runs a current. What does smoke do to the current?

How is this technology similar to a photoelectric smoke alarm? What does the photoelectric effect tell us about light?

What else do smoke alarms need to run a current? Public Service Announcement: What should you do as you turn back your clocks this weekend?!?

What else do I need to know for my test? Fission vs. Fusion…or both? Atomic Scientists…what understanding of atomic structure did they give us and how? How to symbolize atoms, ions, and isotopes Themes: Structure Meets Function; Stability and Change – What did we learn in this unit to build on our knowledge of these ideas?

Next long block… We will investigate a radioactive decay curve and connect to the idea of a half life. What does this graph tell us about carbon-14? Do all radioactive elements have the same half-life?

Homework Quiz 1) Be able to determine # protons, neutrons, and electrons from a symbol of an ion, and be able to write a symbol given information about the atom/ion. 2) Using your notes, be able to write and balance a specific type of nuclear equation. 3) Given data, determine the average atomic mass of a sample.