Measurement+&+the+Scientific+Method

__**Directions:**__ a) list and define all vocabulary from the chapter b) type at least 4 sample problems with step-by-step directions of how to solve the problem; list the correct answers (if your chapter doesn't have math, there are still problems and concepts we learned.) c) link at least 3 websites for additional resources to help with studying d) develop your own LEQ questions for the section - what did you think were the key points we learned? e) Once your page is done, visit 4 other chapters and answer their LEQ's. (This can be done on a separate piece of paper.)

Definitions: Accuracy: the closeness of a measurement to the accepted value for a quantity Precision: the agreement of several measurements that have been made in the same way. Measurements are more precise when they have more known decimal points Rules for Identifying Sig Figs: 1) Nonzero digits are always significant Ex: 1,275.3 = 5 2) Zeros between non-zero numbers are significant Ex: 1001.5 = 5 3) Zeros at the beginning of a number are NEVER significant Ex: 0.0053 = 2 4) Zeros after a number after a decimal point are significant Ex: 0.5600 = 4 5) Zeros proceeding an "imaginary" decimal and following a number are not significant Mathematics of Significant Figures: When adding or subtracting number, your final answer can only be as precise as the number that is least precise, in decimals Ex: 2.445 + 2.3 = 4.745 = 4.7 When multiplying or dividing 2 numbers your final answer can only contain as many sig figs as the factor with the least number of sig figs used to find it Ex: 2.565 X 8.30 = 21.2895 = 21.3

Sample Problems: How many significant figures is in the number 1001.6? Answer: 5 How many significant figures is in the number .3600? Answer: 4 How many significant figures is in the number .00000478? Answer: 3 How many significant figures is in the number .567480009 Answer: 9

LEQ Questions: How can we determine how many significant figures a number has? How can we convert numbers? What is accuracy and precision?

Helpful Websites: http://antoine.frostburg.edu/chem/senese/101/measurement/ http://library.thinkquest.org/2923/basic.html http://chemistry.about.com/od/mathsciencefundamentals/a/sigfigures.htm