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lect_2sep29f08 - Outline#2 Using Units 7-JAN-2008 Review...

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1 Outline #2 7-JAN-2008 1. Review - Chemistry, Matter (Classify), Using Units – 2. Scientific Process Based in Observations (Measurements) 3. Temperature conversions Examples 4. Measurements Sig Figs; Precision & Accuracy examples
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2 Review: Using Units (Converting) Given: V (element?) has a density of 5.96 g/cm 3 . Find: Express this in kg/m 3 Soln: Use units. # kg/m 3 = 5.96 g/cm 3 * ???? Chalk or Paper!
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3 Review: density, volume, mass Given: V has a density of 5.96 g/cm 3 . Find: Volume of 50.0 g? Is it (a) 50.0*5.96? (b) 5.96/50.0? (c) 50.0/5.96? Soln: Use units. Work each one out with units. Chalk or Paper!
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4 Scientific Process Observe Draw Conclusions (Hypothesize) Test Conclusions (Design & Do Experiments) If Hypothesis “Survives”, it becomes a Law Ex: Conservation of Mass Reactants’ Mass = Products’ Mass See Quiz #1, Next Slide
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5 Name___________ Quiz 1 TA Name___________ or Lab Section 1. (3) 20.0 g of acetic acid soln. are added to 15.9 g sodium carbonate making CO 2 (g) and leaving a 29.3 g soln. What is the mass of gas released? SHOW WORK.
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