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Unformatted text preview: Quick Review Scientific Method  qualitative and quantitative observations.  Hypothesis  possible explanation for an observation.  Theory vs. a Law  SI units and prefixes (memorize)  Significant Figures Accuracy vs. Precision  Random vs. Systematic Errors  Counting Significant Figures  Significant Figures and Calculations Dimensional Analysis Converting between units, we will always give you conversion factors, you DO NOT need to memorize them. uestion (Chapter 1 #50): You pass a road sign saying New York 112 km. If you drive at a constant speed of 65 mi/h, how long should it take you to reach New York? (0.6214 mi = 1 km and 3.785 L = 1 gal) nswer: 112 km = hr 0.6214 mi = 1 km 1 km 1 km X 0.6214 mi 1 km X 1 hr 65 mi 1.1 Importance of Proper Units Lockheed Martin used British units and NASA used metric units which caused a miscommunication and the orbiter to get dangerously close to Mars atmosphere and break into pieces. COST: 125 MILLION DOLLARS http://www.cnn.com/TECH/space/9909/30/mars.metric/ Density uestion: A kg of feathers = A kg of bricks but do they have the same density? Answer: A property of matter that is used as an identification tag. Important in designing materials. Density = mass/volume; units: g/cm3 or g/mL or kg/m3 A kg of feathers will occupy a volume 8 times greater than that of a kg of bricks. The bricks are much denser because they are packed in a smaller volume. Density Continued uestion: For a material to float on the surface of water, the aterial must have a density less than that of water (1.0 g/mL) and must not react with the water or dissolve in (1....
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 Spring '11
 Whitt

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