Chapter 2 exercises

# Chapter 2 exercises - Chapter 2 exercises Questions Note...

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Chapter 2 exercises Questions: Note, solution manual has odd problems answered only. Because of the number of exercises, the problems section is not included 1. Why is it important to report units with scientific measurements a. Me: without using units it is easy to get confused and impossible for another person to understand what the digits represent b. Book: Units must be included with a number so that there is no doubt as to the meaning of the number. For example, if you reported a weight of 5, that would be unclear. However, if you reported a weight of 5 grams there would be no confusion 2. Why is it important to report a certain number of digits with scientific measurements a. The more significant digits, the more precise the measurement is. 3. Why is scientific notation important? a. Me: scientific notation eliminates problems caused by extremely large or small numbers—while they do not affect the math, they take away some of the likelihood that you will make a mistake while doing the math. b. Book: Scientific notation is used to make very small numbers and very large numbers easier to write and to understand. 4. If a measured quantity is written correctly, which digits are certain? Which are uncertain? a. Every digit is certain, except for the final digit which is rounded 5. Explain when zeros count as significant digits and when they do not. a. Me: Zeros are significant if they are between two numbers, or are they are at the very end of the number. b. Book: zeros in the middle of two other numbers ARE significant. Zeros at the end of a number ARE significant. Zeros at the beginning of a number are NOT significant. Zeros at the end of a number are ambiguous. Avoid using these numbers and use

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## This note was uploaded on 07/02/2008 for the course 004 007 taught by Professor Haverhals during the Summer '08 term at University of Iowa.

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Chapter 2 exercises - Chapter 2 exercises Questions Note...

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