Last modified: Tue 10/01/2013 09:40:15 pm

Oklahoma State University

This is BCE # 2. It is OK to use your textbook, but if you can answers the questions without it that is OK too. Lets see how well you understand significant figures and significant figures in calculations. Although we have not discussed conversions, lets try a few of those also.

Answer all of the questions below. If you do not know an answer enter CNA. However, it will help me the most if you answer each question with your best intuition/idea about what would be a reasonable answer.


The BCE must be completed before class starts, for this BCE class has already met. It will not count towards your BCE total. NOTE: If class has not started and you receive this message, go ahead and do the BCE, I'll still count it.

First Name:

Last Name:

School:

1. Indicate the number of significant figures in each of the following measurements,

a) 50.50 mLs

b) 0.000300 gms

2. Round each of the following numbers to the indicated number of sig figs.

a) 115.4523 km (4 sig figs) km

b) 2.50999 grams (2 sig figs) grams

c) 617,050 tons (2 sig figs) tons

3. Complete the following calculations and report the answer to the correct number of significant figure. (In parts a and c, if you want to write your answer in scientific notation use the following format: 3.45 x 104 must be written as 3.45e4.)

a) 83.406 g + 18.14 g = g

Indicate how many significant figures are in your answer in Q3a

b) 1/0.0350 - 1/0.091 = (Note: Assume the numerator (1) is an exact number in each case.)

Indicate how many significant figures are in your answer in Q3b

c) 4.56 x 104 + 2.5823 x 102 =

Indicate how many significant figures are in your answer in Q3c

4) Fun with conversions....watch your significant figures! (There is a table of useful conversion on the inside back cover of your textbook.) (In parts a and c, if you want to write your answer in scientific notation use the following format: 3.45 x 104 must be written as 3.45e4.)

a) How many mLs in 2.50 gallons? mLs

Indicate how many significant figures are in your answer in Q4a

b) How many degrees Celsius is 103 degrees Fahrenheit? C

Indicate how many significant figures are in your answer in Q4b

c) Molybdenum has a density of 10.22 g cm-3. What is the density of molybdenum in pounds foot-3? (Check out the discussion on pages 27 - 29 in your textbook.)

pounds foot-3

Indicate how many significant figures are in your answer in Q4c

5. Is there anything about the questions that you feel you do not understand? List your concerns/questions.

6. If there is one question you would like to have answered in lecture, what would that question be?