CHEM 112 Lecture Notes - Lecture 2: Significant Figures, Gas Constant
14 Nov 2018
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Homework: ch2 #"s 3,5,11,51,57,63 and added calculations from ch 2. 7, 2. 8, 6. 3. Systematic error (determinate error): it"s something that happens regularly. Random error (indeterminate error): more random, due to someone misreading an instrument (meniscus) Accuracy: how close something is to the real value, how close are two scale readings to the true value. Precision: how reproducible something is, how close are two scale readings to each other. Exceptions: numbers from log calculations (for example ph) only numbers after the decimal are, defined coefficients are exact numbers with an infinite number of significant figures significant (mantissa) Multiplication: sig figs to number with least amount of them. Logs: sig figs but only after the decimal. Don"t round until the very last step at the end but make sure i do. Dimensional analysis: units must cancel out, check this before we do the actual calculation (what wayling did all of the time)
