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Unformatted text preview: L E C T U R E N O T E S LECTURE 6 Dimensional Analysis (5.6) GENERAL CHEMISTRY Fall 2009 Updated: 11/22/2011 5.6 Dimensional Analysis I. Dimensional Analysis (also known as factor-labeling) A. An approach to solving problems a. Think of ratios (e.g., cow example) i. 1 cow makes 3 moos; therefore, 3 cows make how many moos? The ratio 1 cow / 3 moos is important. B. Converting between units a. One step b. Two step C. Basics Yesterday we showed that there are 2 parts to a problem, the numbers and the units. 112.07 g 9.2 mL = 12.181521739 g/mL We round the answer to 12 g/mL because 9.2 mL has 2 significant figures. The sig. fig. rule to remember is that in multiplication and division the answer is rounded to the least significant figure from the variable terms. (1) Do the math on your calculator (2) Do the units a. Never forget the units. We do not say someone is 6 tall but 6 Never forget the units....
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This note was uploaded on 11/22/2011 for the course CHEMISTRY CHM1025 taught by Professor Laurachoudry during the Fall '10 term at Broward College.
- Fall '10