Announcements

1
Announcements
No Clicker Questions Today

• Exam Wed. To speed getting started do not enter
  class until I let you in.
• Still not successfully signed up for e-mail
  discussion list Xoing Chang Jazz Singh.

• Chapter 3 reading and problems will be posted on
  Wednesday.
• Quiz 2, Today (sections 1.6-2.8).
• Reminder download handout for this week's labDo
  prelab pages.

2
Review

• Fission reactions.
• 23993Np 10n --gt 14256Ba 410n 9437Rb,
• Chain reactions Releases energy
• Nuclear reactors.
• Making artificial isotopes by fusion of nuclides
  using accelerators.
• Measuring radioactivity
• Units counts/s Bq Ci 3.7 x 1010 Bq
• Measure with film or Geiger Counter.
• Biological effectsionizing radiation damages by
  ionizing molecules and breaks them into reactive
  fragments.

3
Radioactive Dating

• Expression for fraction left at time, t
• Solving for t t t1/21/ln(0.5)ln(At/Ao)
• Carbon Dating
• Use 14C/12C ratio for At and Ao
• Use new sample to get Ao
• Other isotopes Aostable product remaining
  radionuclide At remaining radionuclide.

4
Chapter 1-Matter and Its Origins

• I. Significant figures/digits (accuracy and
  precision)
• J. Properties of light
• 1)Light is a wave ?c/?
• 2) Doppler Effect
• K. metric prefixes (n, µ, m, c, k)
• L. Radioactive Decay/Half-Life
• M. Atomic Particles (neutrons, protons,
  electrons)
• N. Atomic Number/Atomic Mass/Isotopes
• O. Temperature (K, C, F)
• P. Black body radiation

• A. States of matter (s, l, g)
• B. Pure substances vs. Mixtures (homo vs.
  heterogeneous)
• C. Elements and Atoms
• D. Compounds and Molecules
• E. Physical properties (color, state, density,
  conductivity, thermal conductivity, metallic
  character)
• F. Physical vs. Chemical Change
• G. Scientific Process/Method
• H. Big Bang
• energy-gtquarks-gtn -gt p e- -gt nucleons -gt atoms
  -gt stars/galaxies