Homework Due Friday Mar 4

1) Read all pages sent by email and answer the following questions:

1) How did the discovery of radioactivity lead to the discovery of protons and neutrons? (p. 206)

2) Explain how the solar system model of the atom had initial but limited success (p. 206)

3) What is an optical microscope? (p. 206)

4) What does it mean to “infer” something from experimental evidence? (p. 206)

5) What is a plausible idea? (p. 206)

6) List the two “plausible ideas” postulated by the Greeks about the structure of water in your own words (p. 206)

7) What does it mean for water to be homogenous throughout? (p. 206)

8) Who were Plato and Aristotle? (p. 206)

9) “Indivisible minute particles called atoms make up all matter.”  What are minute particles? (p. 206)

10) Why is the second statement in Dalton’s Atomic Theory not technically correct? (p. 206)

11) Give an example of a compound that illustrates statement 4. (p. 206)

12) What does this sentence mean “there was skepticism about something that could not be observed directly”? (p. 206)

13) Describe the irony in the fact that the existence of atoms came to be accepted in the early 1900s after it was discovered that atoms have parts. (p. 206)

14) Thomson found that all cathode rays are composed of particles with a fixed charge to mass ratio that is independent of the material from which the cathode rays came.  Suppose that Thompson had discovered that the charge to mass ratio of cathode ray particles varied depending on the material of the electrodes.  Would his conclusions about electrons have been different? (p. 207)

15) Thomson found the charge-to-mass ratio of electrons and Millikan measured the charge of the electron.  Using those two values, find the mass of the electron. (p. 207)