GEOL 202 Lecture Notes - Lecture 7: Unified Atomic Mass Unit, Atomic Number, Chemical Energy
Document Summary
Lecture 7: physics, chemistry, & energy flow 9/9/16. Energy: society"s most important problem: goals: to understand the physical and chemical basis of energy , understand this relationship to society, relate this parameters to energy demands, sources and associated problems, determine how society can respond. Things to know: ions, isotopes, electrons; the nucleus, different forms of energy, the carbon problem. What is energy: the ability to do work, ultimately, matter and energy relate, remember we burn coal & petroleum (matter) in order to collect heat (energy) Energy has many forms: chemical, electrical, mechanical, nuclear, electromagnetic (heat, light and sound) Physical laws: first and second laws of thermodynamics, 1st law conservation: energy is neither created no destroyed, only changes form. !2: 2nd law - entropy: physical systems move from high energy states (complexity) to low energy states (less complexity) How atoms relate to elements: an element is defined by the number of protons.
