Chem Chapter 2 PP - Important Read Before Using Slides in...

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Important – Read Before Using Slides in Class Instructor: This PowerPoint presentation contains photos and figures from the text, as well as selected animations and videos. For animations and videos to run properly, we recommend that you run this PowerPoint presentation from the PowerLecture disc inserted in your computer. To run the animations on these slides please click on the icon on each still. If you prefer to customize the presentation or run it without the PowerLecture disc inserted, the animations and videos will only run properly if you also copy the associated animation and video files for each chapter onto your computer. Follow these steps: 1. Go to the disc drive directory containing the PowerLecture disc, and then to the “Media” folder, and then to the “PowerPoint_Lectures” folder. 2. In the “PowerPoint_Lectures” folder, copy the entire chapter folder to your computer. Chapter folders are named “chapter1”, “chapter2”, etc. Each chapter folder contains the PowerPoint Lecture file as well as the animation and video files. For assistance with copying the slide and video files, please visit our Technical Support at www.cengage.com/support or call (800) 423-0563. Thank you.
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2 2 Chemical Formulas and Composition Stoichiometry
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3 Chapter Goals 1. Chemical Formulas 2. Ions and Ionic Compounds 3. Names and Formulas of Some Ionic Compounds 4. Atomic Weights 5. The Mole
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4 Chapter Goals 1. Formula Weights, Molecular Weights, and Moles 1. Percent Composition and Formulas of Compounds 2. Derivation of Formulas from Elemental Composition 3. Determination of Molecular Formulas 4. Some Other Interpretations of Chemical Formulas 5. Purity of Samples
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5 Chemical Formulas Chemical formula shows the chemical composition of the substance. ratio of the elements present in the molecule or compound He, Au, Na – monatomic elements • O 2 , H 2 , Cl 2 – diatomic elements • O 3 , P 4 , S 8 - more complex elements • H 2 O, C 12 H 22 O 11 – compounds Substance consists of two or more elements
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6 Chemical Formulas Compound 1 Molecule Contains HCl H 2 O NH 3 C 3 H 8 3 C atoms & 8 H atoms
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7 Ions and Ionic Compounds Ions are atoms or groups of atoms that possess an electric charge. Two basic types of ions: Positive ions or cations one or more electrons less than neutral Na + , Ca 2+ , Al 3+ • NH 4 + - polyatomic cation Negative ions or anions one or more electrons more than neutral F - , O 2- , N 3- • SO 4 2- , PO 4 3- - polyatomic anions
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8 Ions and Ionic Compounds Sodium chloride table salt is an ionic compound
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This note was uploaded on 12/18/2010 for the course CHEM 1101 taught by Professor Crespen during the Spring '10 term at Aberystwyth University.

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Chem Chapter 2 PP - Important Read Before Using Slides in...

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