CHEM 001W Lecture Notes - Lecture 2: Graduated Cylinder, Significant Figures, Scientific Notation
Document Summary
9/28/2016 - ch 1 pt ii measurement & calculations. In order to collect data in the course of scientific inquiry, we often need to make measurements. We also need to manipulate measurements in order to interpret them. Using a graduated cylinder to make a volume measurement. Read from bottom of meniscus (ex: 9. 51ml 3 significant digits sig figs ) 47 openstax: addition/subtraction, multiplication/division, multi-step calculations, rounding off numbers/measurements to the correct number of sigfigs. Ex: report the answer of the calculation to the correct number of sig digits: (80. 21g - 80. 21 - 79. 93 = 0. 28g / 65. 22ml = 0. 00429 g/ml. Lowest number of sig digits determine where you round = 0. 0043 g/ml. Expressing very large or very small numbers more easily: 1,700,525 g = 1. 7 x 10^6 g, 0. 000575 = 5. 75 x 10^-4 g. Ex: 7. 0 x 10^6 / 3. 5 x 10^-3. Divide the numbers before the exponent and subtract the exponents.
