Chapter 17 Winter 2011

Chapter 17 Winter 2011 - Did you read chapter 17 before...

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Did you read chapter 17 before coming to class? A. Yes B. No Orbitals a) Are figments of my professor’s imagination b) Describe the path that an electron travels as it orbits the nucleus c) Are standing probability waves that surround an atom and describe where an electron may be found d) Were proposed by Rutherford to explain his experiments On to Chemistry s Having established the existence of molecules and atoms, we now take several chapters to explore their properties. What varieties are there? What are the natures of the pure elements? Why? How do atoms interact and combine together when they form molecules? Chemical properties can vary widely even when other physical properties are similar
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Chemical properties can vary widely even when other physical properties are similar Chlorine Nitrogen How can we explain the enormous variety of chemical behaviors with a single model? Early work led to the law of constant composition: s Compounds contain a fixed definite proportion of the elements. Example: Water By mass: 2 parts hydrogen for 16 parts oxygen An oxygen is 16 times more massive than a hydrogen atom, so we have two hydrogen atoms per oxygen John Dalton proposed the atomic theory s Matter is composed of small indivisible particles called atoms s An element contains only a single kind of atom. Atoms of a given element are
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Chapter 17 Winter 2011 - Did you read chapter 17 before...

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