2011_Spring_1_key - CHEMISTRY 1A SPRING 2011 EXAM 1 KEY...

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1 CHEMISTRY 1A SPRING 2011 EXAM 1 KEY CHAPTERS 1-4 You might find the following useful. Electronegativities H 2.2 Li Be B C N O F 0.98 1.57 2.04 2.55 3.04 3.44 3.98 Na Mg Al Si P S Cl 0.93 1.31 1.61 1.9 2.19 2.58 3.16 K Ca Ga Ge As Se Br 0.82 1.0 1.81 2.01 2.18 2.55 2.96 Rb Sr In Sn Sb Te I Xe 0.82 0.95 1.78 1.96 2.05 2.1 2.66 2.6 Cs Ba Tl Pb Bi Po 0.79 0.89 2.33 2.02 2.0 2.2 Densities Substance Density g/mL Substance Density g/mL battery acid 1.29 magnesium, Mg 1.74 benzene, C 6 H 6 0.879 nitrobenzene, C 6 H 5 NO 2 1.20 blood (whole) 1.05 oleic acid 0.895 bromine, Br 2 3.12 sea water 1.025 copper, Cu 8.94 sodium chloride, NaCl 2.16 chromium(III) oxide, Cr 2 O 3 5.2 sulfuric acid (concentrated) 1.84 gasoline 0.7025 triethylene glycol 1.12 Gold, Au 19.0 trinitrotoluene, TNT 1.654 Iron, Fe 7.87 water at 20 C 0.997
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2 Answer the following by writing the word, words, letter, letters or number in each blank that best completes each sentence. (1 point each blank) 1. Isotopes are atoms that have the same number of protons but different numbers of neutrons. They have the same atomic number but different mass numbers. 2. Electronegativity is a measure of the electron-attracting ability of an atom in a chemical bond. 3. A(n) oxyanion is a polyatomic ions with the general formula H a X b O c d- . (The a can be 0.) 4. Isomers are compounds that have the same molecular formula but different molecular structures. 5. Molar mass is the mass in grams of one mole of substance. 6. A(n) formula unit is a group represented by a substance’s chemical formula, that is, a group containing the kinds and numbers of atoms or ions listed in the chemical formula. It is a general term that can be used in reference to elements, molecular compounds, or ionic compounds. 7. The accepted SI unit for amount of substance is the mole , which has an abbreviation of mol . 8. The accepted SI base unit for energy is the joule with an abbreviation of J . 9. The chemical symbol for cobalt is Co , for potassium is K , and for silver is Ag .
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This note was uploaded on 03/03/2012 for the course CHEM 100 taught by Professor Mark during the Fall '06 term at Monterey Peninsula College.

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2011_Spring_1_key - CHEMISTRY 1A SPRING 2011 EXAM 1 KEY...

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