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CHEMISTRY 300
Sacramento City College
Chapter 2
Chapter 2 Homework
Please complete all questions on a separate piece of paper. For questions that require
calculations show ALL steps and box all of the answers for full credit.
Questions
1) Define the different types of zeros found in a number and explain whether or not they are
significant.
a) Any digit that is non-zero is significant.
b) When a zero is in between two significant digits they become significant.
c) When a zero appears at the end of a digit or in the decimal portion they
become significant.
2) Give the two conversion factors you can construct using each pair of units.
c) meters and kilometers = 1 kilometer = 1000 meters or 1 x 10-3 kilometer = 1
meter
b) liters and microliters = 1 liter = 1000000 microliter or 1 x 10-6 liter = 1 microliter
a) seconds and milliseconds = 1 second = 1000 millisecond or 1 x 10-3 seconds = 1
millisecond
3) In general, how can you identify whether or not you have written the correct conversion
factor for the problem? The factors that convert each unit need to be equal, that is,
the multiplying or dividing factors of conversion.
4) Construct a conversion factor that can convert from one unit to the other in each pair of
units.
a) meter to km = 1 meter = 1 x 10-3 km or 1 km = 1000 meter
b) inch to cm = 1 inch = 2.54 cm or 0.394 inch = 1 cm
c) pounds to kilogram = 1 pound = 0.454 kilogram or 2.205 pounds = 1 kilogram
Scientific Notation
5) Convert each number into scientific notation
a. 736,350 = 736,350/100,000 = 7.3635 x 105
b. 0.0042 = 4.2 x 10-3
c. 2500 = 2.5 x 103
d. 0.478 = 4.78 x 10-1
6) Convert each number into decimal notation
a. 7.42 x 103 = 7420
b. 1.3 x 10-3 = 0.0013
c. 1.5 x 106 = 1500000
d. 1.5147 x 10-5 = 0.000015147
7) Fill in the blank
Scientific Notation
a) 4.7 x103
b)
7...