CHEM23 Final Exam Review Sheet: Chapter 2 (Measurement & Problem Solving): SI units, including the more common prefixes (centi-, milli-, kilo-) Scientific notation: • Converting whole numbers to scientific notation: Significant Figures: General concept (ie: used in measurements; last digit “uncertain”) 5 Rules governing how many significant figures a value has: Calculations using significant figures w/ proper rounding of numbers:Dimensional Analysis: • Concept of the “per expression” (ie: conversion factor). o Conversion factors are just as valid if their reciprocal is used: o or if both the numerator & denominator is set to a power • General solution map of how to solve a dimensional analysis problem. o Write down given info, identify unknown value, set up equation using conversion factors, make sure units cancel each other. • Density as an IMPORTANT conversion factor, connecting mass to volume and volume to
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