CHM 1045
Dr. Michael Blaber

Name_________________________

SS #__________________________

Homework #1

  1. Are the following mixtures or pure substances? If they are mixtures, are they homogenous or heterogenous? (2 points total)
    1. A chocolate chip cookie
    2. Yogurt (the kind with fruit on the bottom)
    3. Bottled water
    4. A lead fishing sinker
  1. You spill some sugar in a sandbox. You scoop it up as best you can, but now you have a mixture of sand and sugar. How could you separate the two? (2 points total)

    2.  

     

     

  2. Something simple, like a candle burning, involves the following various steps which occur at the burning wick: a) the wax is heated and melts. b) The melted wax is heated further and emits flammable vapor. c) the vapors are combined with oxygen in the air and ignite to produce heat, light and soot. d) the soot may collect around the wick, making it black in color. Which of these involve chemical processes and which involve physical processes? (2 points total)

    3. a.

    b.

    c.

    d.

  3. If the charge of an electron was actually twice the value found by Millikan, and the charge-to-mass ratio was twice the value found by Thompson, what would be the mass of an electron? (2 points total)

    4.  

     

     

  4. For the "electron" in question 4, how would it behave in comparison to the b- rays in an electric field type of experiment? (2 points total)