Chemistry - system Temperature Scales ° F ° C K T F = T...

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Chemistry 9/13/07 1.5 Energy: A fundamental part of physical and chemical chance Energy is the capacity to do work Work = force x distance Total energy = potential energy(position, composition) + kinetic energy(motion) + thermal energy (heat, temperature, kind of kinetic energy) Law of conservation of energy Energy is neither created nor destroyed 1.6 Units of Measurement Measurement Quantitative observation consisting of two parts… 1) Number 2) Scale (unit) standard Quantity = number x unit SI Units (system international) Based on the metric system and on units derived from the metric system
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Unformatted text preview: system Temperature Scales ° F ° C K T F = T c * (180 ° F/100 ° C) + 32 ° F ° C = 273.15 K = 32 ° F T K = T C + 273.15 K Prefixes Use prefixes to express smaller and larger units Kilo- (k) = 1,000 Centi- (c) = 1/100 Milli- (m) = 1/1000 Micro- ( μ ) = 10-6 Nano- (n) = 10-9 Density = mass/volume Units – kg/m 3 or g/mL (also g/cm 3 ) D water = 1 g / mL 1.7 Reliability (and Uncertainty) in Measurements Measurements always have some degree of uncertainty (“error”) Significant digits = the certain digits and the 1 st uncertain (rounded/estimated) digit...
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