CONTENTS Preface xxv INTRODUCTION he Origins of Organic Chemistry 1 Berzelius, Wohler. and vitalism 1 The Structural Theory 3 Electronic Theories of Structure and Reactivity 3
this chapter and the next we extend our coverage of conjugated systems to include arenes. Arenes are hydrocarbons based on the benzene ring as a structural unit. Ben- are zene, toluene, and naphthalene, for example, are arenes
tructure* is the key to everything in chemistry. The properties of a substance depend on the atoms it contains and the way the atoms are connected. What is less 0 obvious, but very powerful, is the idea that someone who is trained in chemistry can look at a structural formula of a substance and tell you a lot about its properties
Indicated Airspeed a Indicated on Instrument a Measurement of pressure on Aircraft(ie Load) O Used for structural operating limits Calibrated Airspeed a Pitot-Static Errors calibrated out a Used for Flight test and performance Groundspeed a Achieved speed over ground
Three Ways to Describe Crystal Structures Three Structural sketches of P4O10 molecules: (a)Stick-ball model：showing that the P-O chemical bond is the tetrahedral coordination and sp3 covalent bonds
Overview Definition : Osteoporosis is a bone disease in which the amount of bone is decreased and the structural integrity of trabecular bone is impaired. Cortical bone becomes more porous and thinner. This makes the bone weaker and more likely to fracture
