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Unformatted text preview: Chapter 20 Chemical Reactivity Quiz: Did you read Chapter 20 for today? ) es a) Yes b) No Earth What is the molecular weight of water H 2 O? a) 3 amu b) 16 amu 3 c) 18 amu d) 1 x 10 18 amu Chapter 20 a) Made total senseIve seen this before b) Seemed reasonable but I need to see it again c) Im struggling to put the pieces together So far, Unit 3 is a) Easier than Unit 2 b) Harder than Unit 2 c) About the same (easy) ) bout the same (hard) d) About the same (hard) The gasoline engine of an automobile is only about 20% efficient. Which of the following best explains why? a) Engineers and scientists simply havent figured it out yet. b) There is too much friction in the engine. c) All engines, regardless of type, have exactly the same efficiency, which is less than 100%. d) Some of the chemical potential energy in the gasoline must become ambient thermal energy to supply the kinetic energy of the automobile. e) The automobile engine is actually nearly 100% efficient as long as the automobile isnt traveling uphill, where some of the energy must be converted to gravitational potential energy. Review s Electrons reside in orbitals about atoms. s The orbital sets where the valence electrons reside usually are not completely filled. s Atoms will exchange or share electrons in order s Atoms will exchange or share electrons in order to fill orbital sets. This creates bonds. s The act of creating bonds will naturally minimize energy and maximize disorder (entropy). What happens to orbitals when atoms bond together?...
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This note was uploaded on 11/30/2011 for the course PHY S 100 taught by Professor Staff during the Winter '08 term at BYU.
- Winter '08