Chapter03_StudentLecture_Fall09

Chapter03_StudentLecture_Fall09 - Chapter 3 Molecules...

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Chapter 3: Molecules, Compounds, and Chemical Equations Learning Objectives: 3.2 Chemical Bonds 3.3 Chemical Formulas and Molecular Models 3.4 An Atomic-Level View of Elements and Compounds 3.5 Ionic Compounds: Formulas and Names 3.6 Molecular Compounds: Formulas and Names 3.7 Formula Masses and the Mole Concept for Compounds 3.8 Compositions of Compounds 3.9 Determining a Chemical Formula from Experimental Data 3.10 Writing and Balancing Chemical Equations Homework: 24, 28, 32, 34, 38, 40, 44, 46, 48, 50, 52, 54, 56, 58, 66, 76, 82, 86, 88, and 100.
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Tro, Chemistry: A Molecular Approach 2 Elements and Compounds elements combine together to make an almost limitless number of compounds the properties of the compound are totally different from the constituent elements
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Tro, Chemistry: A Molecular Approach 3 Formation of Water from Its Elements
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Tro, Chemistry: A Molecular Approach 4 3.2 Chemical Bonds compounds are made of atoms held together by chemical bonds bonds are forces of attraction between atoms the bonding attraction comes from attractions between protons and electrons
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Tro, Chemistry: A Molecular Approach 5 Bond Types two general types of bonding between atoms found in compounds, ionic and covalent ionic bonds result when electrons have been transferred between atoms, resulting in oppositely charged ions that attract each other generally found when metal atoms bonded to nonmetal atoms covalent bonds result when two atoms share some of their electrons generally found when nonmetal atoms bonded together
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Tro, Chemistry: A Molecular Approach 6
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7 3.3 Representing Compounds with Chemical Formula compounds are generally represented with a chemical formula the amount of information about the structure of the compound varies with the type of formula all formula and models convey a limited amount of information – none are perfect representations all chemical formulas tell what elements are in the compound use the letter symbol of the element
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Tro, Chemistry: A Molecular Approach 8 Types of Formula Empirical Formula Empirical Formula describe the kinds of elements found in the compound and the ratio of their atoms they do not describe how many atoms, the order of attachment, or the shape the formulas for ionic compounds are empirical
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Tro, Chemistry: A Molecular Approach 9 Types of Formula Molecular Formula Molecular Formula describe the kinds of elements found in the compound and the numbers of their atoms they do not describe the order of attachment, or the shape
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Tro, Chemistry: A Molecular Approach 10 Types of Formula Structural Formula Structural Formula describe the kinds of elements found in the compound, the numbers of their atoms, order of atom attachment, and the kind of attachment they do not directly describe the 3-dimensional shape, but an experienced chemist can make a good guess at it use lines to represent covalent bonds each line describes the number of electrons shared by the bonded atoms
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