ChemHMWK5 - Weinelt Karl Homework 5 Due midnight Inst Donna...

Weinelt, Karl – Homework 5 – Due: Oct 12 2003, midnight – Inst: Donna Lyon 1
This print-out should have 25 questions, check
that it is complete. Multiple-choice questions
may continue on the next column or page:
find all choices before making your selection.
The due time is Central time.
This assignment is due Sunday, October 12,
by midnight.
001 (part 1 of 1) 10 points
Cathode rays are ? . These particles have
the ? charge/mass ratio of the fundamen-
tal particles found in the atom.
1. None of the other answers is correct
2. protons, smallest
3. electrons, largest
4. neutrons, largest
5. protons, largest
002 (part 1 of 1) 10 points
When combined with Thomsoms determina-
tion of the mass to charge ratio of the electron,
Millikans experimental work allowed for the
determination of the
1. charge on the electron.
2. All of the above.
3. speed of the electron.
4. mass of the electron.
003 (part 1 of 1) 10 points
What experimental evidence led Thomson to
conclude that cathode rays were negatively
charged?
1. Cathode rays were deflected towards a
negatively charged plate
2. Cathode rays pushed a paddle wheel
counterclockwise
3. False; cathode rays are positively charged,
not negatively charged
4. Cathode rays were deflected towards a
positively charged plate
5. Cathode rays pushed a paddle wheel
clockwise
004 (part 1 of 1) 10 points
In the cathode ray tube experiment, it was
found that a beam of cathode rays were able
to turn a paddle wheel, thus proving that
1. electrons are negatively charged.
2. electrons have mass.
3. cathode rays are actually electrons.
4. all of the above.
5. protons are positively charged.
005 (part 1 of 1) 10 points
A proton is about ? an electron.
1. 200 times heavier than
2. about the same mass as
3. 2000 times heavier than
4. 2000 times lighter than
006 (part 1 of 1) 10 points
Rutherfords α -scattering experiment showed
that most α particles directed toward a thin
metallic foil passed through with only slight
deviations.