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Week 2 Lectures - Chem 139 - Fundamental Units SI System...

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Fundamental Units SI System Examples: Mass (weight): Length: Temperature: Time: Pressure: Other measurement units are derived from the base units; accordingly, they are called Derived Units Examples: Density, Speed, Concentration Kilogram (kg) Meter (m) Kelvin (K) Second (s) Pascal (Pa)
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Mass vs. Weight Weight = mass x acceleration due to gravity Mass ≠ Weight!
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Length leads to Volume Fundamental Unit of Length = 1 meter Defined as distance traveled by light in 1 / 299,792,468 second 1 / 100 of a meter is a centimeter (cm) A cube of water that is 1 cm on a side has a volume of 1 cm 3 This volume of water is one milliliter (ml) 1 ml = 1 cm 3 (remember this!) It has a mass of 1 gram at 4C thus, 1 ml (of water ) weighs 1 gram at 4C. 1000 ml = 1 liter; how much does this weigh? 1 liter = 1 dm 3 (handy to know) 1 cubic meter has 1000 liters …. How much does this weigh?
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4 Temperature http://climate.uvic.ca/climate-lab/front_page_pics/temperature.html http://www.sensorprod.com/dynamic/temperature_mapping.php
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8 Fig. 3-8, p. 77 Note that the “size” of a degree is different in the Fahrenheit and Celsius scales. F = 9/5*C + 32 The Celsius and Kelvin scales have the same degree size. K = C + 273 http://www.sizes.com/units/tempera ture_Fahrenheit.htm
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Temperature Conversions 1. Convert 38 F to Celsius. 2. Convert 295 K to Celsius. 3. Convert 58 F to Kelvin.
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Chemical Kinetic Energy Petrucci, Fig. 7.9 How do molecules move around? Translation: motion through space Rotation : motion about the center of mass Vibration: motion directed through chemical bonds
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Kinetic Molecular Theory Temperature = movement of particles Hot objects have (fast/slow) _______moving particles Cold objects have (fast/slow) _______moving particles Increasing the speed of particles (increases/decreases) __________ temperature Only temperature without particle movement is ___________________________ How do particles in a solid move vs. in a liquid or gas?
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Faster water molecules Slower water molecules Lukewarm water (50 o C) Faster, slower?
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