ࡱ> *,)%` bjbjNN .,,   < < < < < < < < ( * * * * * * $whN -< < < < < N < < {  < :< < ( < (  < 0 8' v ( 0 wd w w ,< < < < < < < N N < < < < < < < D   Ch 2 Wks #1-Rounding and Significant Figs Name___________________ Rules for significant figures Non-zero digits are always significant. Examples: 657 has ______ significant figures 1435 has _____ significant figures Leading zeroes are not significant. Examples: 0.00682 has _____ significant figures 0.035 has _____ significant figures Imbedded zeroes are always significant. Examples: 1.072 has _____ significant figures 0.0108 has _____ significant figures Trailing zeroes are significant if there is a decimal point. Examples: 300 has _____ significant figures 300. has _____significant figures 300.0 has _____ significant figures 0.0030 has _____ significant figures Practice: How many significant figures do the following numbers have? A. 678.0 ______ C. 0.0678 ______ B. 6780 ______ D 6708 ______ Rounding Round 0.06507 to the indicated number of significant figures. A. 3 _______ C. 2 ______ B. 1 _______ Round 8083.05 to the indicated number of significant digits. A. 1 _______ B. 3 _______ C. 4 _______ Operations Addition or Subtraction: The last digit retained is set by the first doubtful digit. Examples: 4.7832 1.0236 1.234 " 0.97268 + 2.02 Multiplication and Division: The answer contains no more significant figures than the least accurately known number. Examples: 2.8723 1.6 = ________ 45.2 6.3578 = ________ Practice: 1. How many significant figures are contained in each of the following measurements? a. 37.4 g b. 6070. dm c. 0.009 03 km d. 605.03 g e. 350.0 K 2. Round off each of the following measurements to the indicated number of significant figures. a. 35.27 g to 3 significant figures b. 0.414 kL to 2 significant figures c. 87.257 dm to 3 significant figures d. 135 K to 2 significant figures e. 6250 cm to 2 significant figures 3. Round off 359.78 to the indicated number of significant figures. a. 2 b. 3 c. 4 d. 1 4. Perform the following calculations and express the answers with the correct number of significant figures. a. 6.43 mL + 2.016 mL b. 2.50 g / 0.04 cm3 c. 6.821 m + 2.0 m + 0.45 m d. 107.38 L - 65 L e. 26.50 dm 0.062 dm f. 1.30 g / 0.02 cm3 &()Cae Y  ? K   " 6 J L  T h n !;ŽŹŹhxh 56>* h >*h h >*hxh 56hxh|5CJaJhxh 5CJaJh hxh'gh|h|h|56 h|56h|h|5CJaJhh5CJaJhh5CJaJ-BCa 2 Y  B g ? K 6 L dhgd 0 j ;b%@ $:]sdhgd89hhH*hhxhx5CJaJdhgd,1h/ =!"#$% @@@ NormalCJ_HaJmH sH tH DAD Default Paragraph FontViV  Table Normal :V 44 la (k(No List BCa2YBg ?K&|;b%@ $:]s0000000000000000000000000000000000000000000000000000000000    !#JMKFOel  %&;<^_tu333333333333333333 | 'gx@x(@@@ @@UnknownGz Times New Roman5Symbol3& z Arial"qhQsFl *J[J[!42HX ?2)Ch 2 Wks #1-Rounding and Significant FigsnvolkernvolkerOh+'0 $0 P \ ht|,Ch 2 Wks #1-Rounding and Significant Figsnvolker Normal.dotnvolker3Microsoft Office Word@| @N~@J[՜.+,0 hp  crsd' *Ch 2 Wks #1-Rounding and Significant Figs Title  "#$%&'(+Root Entry F'-1TablewWordDocument.SummaryInformation(DocumentSummaryInformation8!CompObjq  FMicrosoft Office Word Document MSWordDocWord.Document.89q