Day 7 in SCI110: Chemistry

• Spring 2006 Schedule

• Last time: Wrap up
  • Statistical analyses for vital capacity
    • regression -- failed to reject null hypotheses of no relationship
    • t-test -- rejected null hypothesis of no sex difference
  • Homework questions from Correlation and Regression worksheet (pp. 14-19)
  • Discussion of pendulum questions
  • The Periodic Table
  • Experiment: separating metals from non-metals (pp. 34-36)

• Today:
  • Hand back quizzes, and go over results.

  • Periodic table recap
    • The Periodic Table (with Tim and Moby)
    • Isotopes (with Tim and Moby)

  • Discussion of results of experiment:
    • Metals show:
      • malleability
      • ductility
      • luster
      • conductivity
    • Problems? Observations?
    • t-test of results for solubility

  • Discussion of reading, chapter 9: 192-201
    • Tim and Moby
    • Element - pure substance, cannot be decomposed; smallest unit, the atom
    • Compound - made up of several elements; smallest unit, the molecule
    • Physical change - hammering, evaporization, melting, crushing, dissolving....
    • Chemical reactions - a change in which different chemical substances are created by forming or breaking chemical bonds
      • chemical energy - used or released
      • chemical equation - inputs and outputs
    • Valence electrons - electrons in the outer shell
    • Chemical bond - an attractive force that holds atoms together in a compound
      • ionic bonds - atoms transfer electrons; electrostatic bond
      • ionic compounds - compounds held together by ionic bonds:
        • NaCl
        • MgF₂
      • covalent bonds - atoms share electrons
        • H₂
        • F₂
        • double bond: C₂H₄
        • triple bond: C₂H₂
      • metallic bonds - shared "electron sea"
    • QFT (Questions for Thought): p. 212, 1, 3, 4

    • Parallel Exercises, p. 213: Group B, 1-3

  • Experiment - physical and chemical changes -- p. 37-39

• Homework:
  • Take the chemical versus physical change quiz (study up with their guide first!)
  • Use this sheet as one guide for understanding the chemistry we do in this class.
  • More reading! Chpt 10: 217-219 and Chpt. 10: 224-227; QFT 4,5,7-10

Links:

• What is the difference between a physical change and a chemical change?