CHAPTER 07 - Important Read Before Using Slides in Class...

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Unformatted text preview: 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. 7 Chemical Bonding 3 Chapter Goals 1. Lewis Dot Formulas of Atoms Ionic Bonding 1. Formation of Ionic Compounds Covalent Bonding 1. Formation of Covalent Bonds 2. Bond Lengths and Bond Energies 3. Lewis Formulas for Molecules and Polyatomic Ions 4 Chapter Goals 1. Writing Lewis Formulas: The Octet Rule 2. Formal Charges 3. Writing Lewis Formulas: Limitations of the Octet Rule 4. Resonance 5. Polar and Nonpolar Covalent Bonds 6. Dipole Moments 7. The Continuous Range of Bonding Types 5 Introduction Attractive forces that hold atoms together in compounds are called chemical bonds. The electrons involved in bonding are usually those in the outermost (valence) shell. 6 Introduction Chemical bonds are classified into two types: o Ionic bonding results from electrostatic attractions among ions, which are formed by the transfer of one or more electrons from one atom to another. o Covalent bonding results from sharing one or more electron pairs between two atoms. 7 Comparison of Ionic and Covalent Compounds Melting point comparison Ionic compounds are usually solids with high melting points Typically > 400 o C Covalent compounds are gases, liquids, or solids with low melting points Typically < 300 o C Solubility in polar solvents Ionic compounds are generally soluble Covalent compounds are generally insoluble 8 Comparison of Ionic and Covalent Compounds Solubility in polar solvents Ionic compounds are generally soluble Covalent compounds are generally insoluble Solubility in nonpolar solvents Ionic compounds are generally insoluble Covalent compounds are generally soluble 9 Comparison of Ionic and Covalent Compounds Conductivity in molten solids or liquids Ionic compounds generally conduct electricity...
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CHAPTER 07 - Important Read Before Using Slides in Class...

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