1. Today our muscles supply what percentage of work done?
What was this percentage in 1950?
What was this percentage in 1800?
What was this percentage 5 million years ago?

2. Describe a way to produce energy that causes no environment harm.

3. Who supplies your electricity? What alternative choices do you have?

4. Why has the industrial world’s per capita use of energy remained about the same in the past decade even though the world’s economy has increased by 50%?

5. The amount of energy used depends on what two factors? Give some additional examples of each.

6. What are fossils?

7. What are fossil fuels?

8. List all fossil fuels?

9. list 10 ways you used energy today to make your life easier, better.

10. How great a connection do you believe there is between us obtaining the energy we want and war?

11. Determine what energy resources are used to provide energy in Virginia and their percentage contributions. Cite two URL’s, at least one of which is government (state or federal). If you complete this you will receive extra credit.

Read, study, and understand the material in your text chapter 13 pages 413-425, 432, 435-436. Answer the questions below and be prepared to discuss this material in class.

1. In your own words describe the atom using the terms electrons, nucleus, protons and neutrons. Ignore quarks, quacks and duck calls.

2. In your own words describe the term “molecule”. What do molecules relate to atoms?

3. Why are the atomic masses of most elements not whole numbers?

4. Suppose you have 10 grams of a radioactive isotope with a half-life of 5 days. How much of this isotope would have decayed after 20 days? Show your work.

5. From the following nuclear reaction with heavy ions, find the mass and atomic number of the argon nucleus: Go to your text page 433 question 9 and answer it here.

6. Using figure 13.15 calculate how many neutrons are present in the (stable) lead-206 nucleus.

1. Today our muscles supply what percentage of work done? What wa...