1. Mr. Markwalter

2. It’s a log jam…

6. Quiz!

7. 15 minute maximum. All desks clear. Silence until I have all quizzes back in.

8. AAAAAplications Of logarithms.

9. In 2001, there was an earthquake in Gujarat India. It measured 7.9 on the Richter scale.

10. In 1999, there was an earthquake in Athens, Greece. It measured 5.9 on the Richter scale.

11. In 2001, there was an earthquake in Gujarat India. It measured 7.9 on the Richter scale. In 1999, there was an earthquake in Athens, Greece. It measured 5.9 on the Richter scale. How many times more severe was the 2001 earthquake than the one in Athens?

12. a=amplitude in micrometers T= the period (don’t worry about this) B accounts for the weakening of the wave What is amplitude?

13. Amplitude measures the severity. Let’s call the amplitude of the Gujarat earthquake a 1 and the Athens earthquake a 2. We want a 1 /a 2

14. Let’s start with this…

15. a 1 /a 2 =100 The Gujarat earthquake was 100 times more severe. The difference in Richter number was 2. 10 2 =100 Coincidence? Let’ let Bill explain.

18.  The measure of the concentration of hydrogen ions (in moles per liter). Psst. A mole is unit, or have you heard?

19.  pH=-log(H + )  H + = the hydrogen ion concentration  More acidic= higher concentration= lower pH

20.  Some vinegar has a pH of 2.4. Some baking soda has a pH of 8.4  What are the hydrogen ion concentrations?  How many times greater is the hydrogen ion concentration of the vinegar than the baking soda?

21. A pretty strong acid has a pH of 1.8 while a base has a pH of 9.8.  What are the hydrogen ion concentrations?  How many times greater is the hydrogen ion concentration of the acid than the base?

22. Option A: I want to start out slow and work my way up. Option B: I feel pretty comfortable with this and am ready to try more.  15 minutes of practice.  5 minutes of review.

23.  An earthquake in Peru was 10000 times more severe than an Earthquake in China. If the earthquake in China scored 2.5 on the Richter scale, what was the score of the Peru earthquake?

24.  Unit 3 Test Corrections Due TODAY  Test Wednesday  Also, the Benchmark Homework  Saturday Help?