AP Chapter 1 - Complex sig figs What if it uses both...

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1 More Preliminaries Scientific Method Metric System Uncertainty Complex sig figs What if it uses both addition and multiplication rules? Round when you change rules. 9.23 8.4 4.53 1.882 - × = ( 29 2.5 1.8 (3.3 2.7) × + × = Scientific method. A way of solving problems Observation- what is seen or measured Hypothesis- educated guess of why things behave the way they do. (possible explanation) Experiment- designed to test hypothesis leads to new observations, and the cycle goes on Scientific method. After many cycles, a broad, generalizable explanation is developed for why things behave the way they do Theory Also regular patterns of how things behave the same in different systems emerges Law Laws are summaries of observations Often mathematical relationship Scientific method. Theories have predictive value. The true test of a theory is if it can predict new behaviors. If the prediction is wrong, the theory must be changed. Theory- why Law – how Law – equation of how things change Observations Hypothesis Experiment Law Theory (Model) Prediction Experiment Modify
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2 Metric System Every measurement has two parts Number Scale (unit) SI system (le Systeme International) based on the metric system Prefix + base unit Prefix tells you the power of 10 to multiply by - decimal system -easy conversions Metric System Base Units Mass - kilogram (kg) Length- meter (m) Time - second (s) Temperature- Kelvin (K) Electric current- ampere (amp, A) Amount of substance- mole (mol) Prefixes giga- G 1,000,000,000 10 9 mega - M 1,000,000 10 6 kilo - k 1,000 10 3 deci- d 0.1 10 -1 centi- c 0.01 10 -2 milli- m 0.001 10 -3 micro- μ 0.000001 10 -6 nano- n 0.000000001 10 -9 Deriving the Liter Liter is defined as the volume of 1 dm 3 gram is the mass of 1 cm 3 Mass and Weight Mass is measure of resistance to change in motion Weight is force of gravity. Sometimes used interchangeably
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This note was uploaded on 09/28/2009 for the course CHEM 102 taught by Professor Freeman during the Spring '08 term at South Carolina.

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AP Chapter 1 - Complex sig figs What if it uses both...

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