CHEM 001A Lecture Notes - Lecture 1: Sodium Bicarbonate, Macroscopic Scale, Significant Figures
8 Mar 2018
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Scientific method: observation - collect information, hypothesis - intuitive explanation, experiment - gather evidence to test, reject/confirm hypothesis - formulate theory or make a new one. Matter: matter is physical material of the universe that has mass and takes up space. Matter: pure or mixture: pure: element or compound, mixture: homogeneous or heterogeneous. Macroscopic scale (top-down) - explaining observations we can see or measure in a laboratory. Length - meter - m: mass - kilogram - kg, time - second - s, temperature - kelvin - k, electric current - amphere - a. Size: tera 12, giga 9, mega 6, kilo 3, hecto 2, deka 1, deci -1, centi -2, milli -3, micro -6, nano -9, pico -12, femto -15. Problem 1: we need 0. 353 kg of baking soda, express mass in milligrams, answer: 353,000 mg of baking soda. Problem 2: to wire your stereo equipment, you need 325 centimeters (cm) of speaker wire that sells for $. 15/ft.
