CH 101 - Week 1 Review of Significant Figures
CH 101 - Week 1 Review of Significant Figures CH 101
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This 2 page Class Notes was uploaded by Alexis Elston on Wednesday August 31, 2016. The Class Notes belongs to CH 101 at University of Alabama - Tuscaloosa taught by Dr. Bakker in Fall 2016. Since its upload, it has received 13 views. For similar materials see General Chemistry 1 in Science at University of Alabama - Tuscaloosa.
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Date Created: 08/31/16
Review of Significant Figures: Any digit that is not zero is significant o 1.234 = 4 significant figures Any zeros between nonzero digits is significant o 606 = 3 significant figures Any zeros to the left of the first nonzero digit are NOT significant o 0.08 = 1 significant figure If a number is greater than 1, then all digits to the left of the decimal are significant o 2.0 = 2 significant figures If a number is less than 1, then all digits at the end and in between are significant o 0.004020 = 4 significant figures Addition and Subtraction of Significant Figures: Round to the lowest number of significant figures used in problem after the decimal point. o 89.332 + 1.1 = 90.432 Round to 1 significant figure after decimal because of 1.1 90.4 is the correct answer o 3.70 – 2.9133 = .7867 Round to 2 significant figures after the decimal because of 3.70 .79 is the correct answer Multiplication and Division: Round to the lowest number of significant figures used in the original problem regardless of a decimal point o 4.51 x 3.6666 = 16.536366 Round to 3 significant figures because of 4.51 16.5 is the correct answer Exact Numbers: Numbers from definitions or objects are considered to have infinite significant figures and should be excluded from rounding purposes o Take the average of 6.64, 6.68, and 6.70 6.64+6.68+6.70 3 = 6.67333 Round to 3 significant figures because 3 is not included (definition of average is how we determined that we would divide by 3) o 6.67 is the correct answer NOTE: No measurement can be more accurate than half the smallest division of the measuring tool
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