F10HW2-CH2 - HOMEWORK WEEK 2 CHAPTER 2 2.15 A molecular...

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HOMEWORK WEEK 2, CHAPTER 2 2.15 A molecular formula gives the exact number of different atoms of an element in a molecule. A structural formula is a picture that shows how the atoms are bonded to one another in a molecule. More examples of the molecular formula are found on pages 970-4 (CH 4 , C 2 H 6 , C 3 H 8 , C 4 H 10 , etc), etc. Examples of structural formulas are found on these pages. The other representation on these pages is the condensed structural formula , such as CH 3 CH 2 CH 3 , which shows the number of H atoms bonded to each C atom. 2.16 Organic molecules contain carbon combined with other elements such as hydrogen, oxygen, and nitrogen. Most contain chains of 2 or more C atoms. An inorganic molecule is usually composed of elements other than carbon. Some inorganic molecules that contain carbon are carbon monoxide (CO), carbon dioxide (CO 2 ), carbonates, and cyanides. 2.17 Ionic binary compounds: NaCl and AlF 3 ; molecular binary compounds: H 2 O, C 52 H 106 . Possible ambiguous cases: HCl: it is molecular, but produces ions in solution – very confusing; PbS: many compounds involving metals towards the right side of the periodic table are neither completely ionic nor completely molecular – we won’t worry about such cases in Chem 0110. Non-binary examples: Ionic: Na 2 SO 4 (contains the SO 4 2- ion); NH 4 Cl: no metals present, but it is ionic: NH 4 + and Cl - . Molecular: A zillion organic compounds, such as ethanol, C 2 H 6 O. 2.18 a. The elements are represented by B, F, and I . b. The compounds are represented by A, E, and G. c. The mixtures are represented by C, D, and H. d. The ionic solid is represented by A. e. The gas made up of an element and a compound is represented by C. f. The mixture s of elements are represented by D and H. g. The solid element is represented by F. h. The solids are represented by A and F. i. The liquids are represented by E, H ?, and I. {OCL} Focus, based on careful observation of the pictures Figure A looks to be a compound composed of two elements in the solid phase. No individual molecules are present. The atoms appear to be ions and interact in such a way that they form a crystal lattice. Figure A is a compound (b), an ionic solid (d), and a solid (h). Figure B.
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This note was uploaded on 02/20/2011 for the course CHEM 110 taught by Professor Dr.huston during the Spring '06 term at Pittsburgh.

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F10HW2-CH2 - HOMEWORK WEEK 2 CHAPTER 2 2.15 A molecular...

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