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Ch2(1-3)Aug29Fa08a - CHEM 109 General Chemistry University...

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CHEM 109 General Chemistry University of Nebraska Friday 29 August 2008
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Density is a physical characteristic ( a measure of “compactness ”) and is an __________________. Defined as mass divided by volume: Units: g/cm 3 . Sometimes this is written as g • cm –3 . Frequently used as a conversion factor (mass to volume) Density Mass and volume are __________________ , they are dependant on the amount of substance.
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The density of a solid or liquid is constant ____________________ Almost always, density _________ with ______________ temperature (why?) ________ is the most common exception (density increases from 0°C to 4 °C) Additional Notes on Density
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Bromine is one of two elements that is a liquid at room temperature (mercury is the other). The density of bromine at room temperature is 3.12 g/mL. What volume of bromine is required if a chemist needs 36 g for an experiment?
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A bag of Hershey’s Kisses contains the following information: Serving size: 9 pieces = 41 g Calories per serving: 230 Total fat per serving 13 g. 1. How many kisses are in a 2.0 lb bag? 2. If the density of a Hershey’s kiss is 1.4 g/mL, what is the volume of a single piece?
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Early Philosophy of Matter Some philosophers believed that matter had an ultimate ______________________ Leucippus and Democritus Other philosophers believed that matter was _______________________ Plato and Aristotle Since there was no experimental way of proving who was correct, the best debater was the person assumed correct, i.e., Aristotle
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Atomic Theory Modern atomic theory began 200 years ago and is based on work by ____________ .
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