Chem102 8.27 - Quick Review- Scientific Method -...

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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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Chem102 8.27 - Quick Review- Scientific Method -...

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