CHEM 130 Lecture Notes - Lecture 1: Kelvin, Scientific Notation, Metric System
16 Sep 2016
School
Department
Course
Professor
Document Summary
Scientific notation (sn: write the following in sn. 64,000 g = 6. 4 x 10^4 g. Time = seconds (s: si system. Kelvin scale for temp. begins at lowest possible temp: 0k. Significant figures (sf: a # is a sf if it is: Not a zero (4. 5 g = 2sf) A zero between digits (205 m = 3sf) A zero at the end of a decimal # (50. l = 2sf, 3. 0 cm = 2sf) In the coef cient of a # written in scienti c notation (4. 8 x 10^5 m = 2sf: a zero is not a sf if it is: At the beginning of a decimal # Rounding: 8. 4234: 3sf = 8. 42, 2sf = 8. 4, 14. 780: 3sf = 14. 8, 2sf = 15, 3256: 3sf = 3260 (3. 26 x 10^3), 2sf = 3300 (3. 3 x 10^3) Multiplication & division: nal answer written so it has the same # of sf as the measurement with the least # of.
