CHM1045 Lecture 3 Outline of Last LectureI. Comparison of TemperatureII. Scientific NotationIII. Addition/ SubtractionIV. Multiply/ DivisionV. Significant FiguresVI. Subtraction/ Addition of SignificantVII. Multiplication/ Division of SignificantVIII. Exact NumbersOutline of Current LectureI. Dimensional Analysis Method of Solving ProblemsCurrent LectureDimensional Analysis Method of Solving Problems1. Determine which unit conversion factor(s) are needed2. Carry units to the calculation3. If all units canceled except for the desired units, then the problem was solved correctlyGiven unit = desired unit = desired unit Given unitEX.1 A person’s average daily intake of glucose (a form of sugar) is 0.0833 pound (lb). Whatis this mass in milligrams (mg)? (1 lb = 453.6 g.).0833lb * 453.6 g * 1000mg = 3.78*10^4 mg 1 lb gEX. 2An average adult has 5.2 L of blood. What is the volume of blood in m3?5.2L * 1dm^3 * 1^3M^3 = 5.2* 1^3 = 5.2*10^3 m^3 1 L 10^3 dm^3 10^3EX.3Liquid nitrogen is obtained from liquefied air and is used to prepare frozen goods and in low-temperature research. The density of the liquid at its boiling point (−196°C or 77 K) is 0.808 g/cm3. Convert the density to units of kg/m3. .808g * 1 kg * 100^3cm^3 = 808kg = 808 kg/m^3 1 cm^3 1000g 1m^3
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