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Unformatted text preview: Chapter 21 Bonding in Metals, Alloys, and Semiconductors Quiz: Did you read Chapter 21 for today? ) es a) Yes b) No Earth The energy released in some chemical The energy released in some chemical reactions comes from reactions comes from a) a) Gravitational potential energy of the atoms Gravitational potential energy of the atoms b) b) Electrical potential energy of electrons in Electrical potential energy of electrons in atoms atoms ) uclear potential energy of neutrons and uclear potential energy of neutrons and c) c) Nuclear potential energy of neutrons and Nuclear potential energy of neutrons and protons in atoms protons in atoms d) d) Kinetic energy of electrons in atoms Kinetic energy of electrons in atoms Why do things react? Reminder: Things happen in nature for two possible reasons: the system proceeds to ________ and/or the universe proceeds to _________? a) lower entropylower energy b) lower energyhigher entropy c) higher energylower entropy d) higher energyhigher entropy Which reaction is balanced? A. C + O 2 b 2CO B. 4Na + 2O 2 b 2Na 2 O . Al + 3O Al C. 4Al + 3O 2 b 2Al 2 O 3 D. C 6 H 12 O 6 + 6O 2 b 3CO 2 + 3H 2 O E. 2K + S b 2K 2 S A catalyst (Pd) ignites hydrogen without needing a match because it A. raises the activation energy of the reaction....
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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