Exam4.1 - Chemistry 115 Exam 4_009B If 10.0 gram samples of...

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Unformatted text preview: Chemistry 115: Exam 4_009B November 17, 2009 . If 10.0 gram samples of the each of the metals below initially at 100°C, were separately placed into 10.0 g of water initially at 25 °C, which metal will the temperature of the water the most? Shown after each metal is its specific heat in J/(g °C). [THINK! !] a. aluminum (0.902) b. copper (0.385) 0. Gold (0.129) d. iron (0.450) . Calculate the heat needed to raise the temperature of 2.75 liter of water from 21 . 1°C to 385°C. Assume density of water is one gram per milliliter. See title page for potentially usefirl information a. 1.00x102 k] b. 275 kJ c. 2.00x102 1d d. 3.50x102 M e. 4.00x102 kJ . The standard heat of formation, AH‘}, is zero for all of the following except 1312(1) \ I2(5) 02(3) Fe(s) C0(g) 9999‘s» . What is the oxidation half reaction in the chemical reaction Cr2072' (aq) + 6Cl” (aq) + 14H+ (aq) —-> 2Cr3+ (aq) + 3C12 (aq) + 7H20(l) ? a. Cr2072‘(aq) +14H+(aq) + 66‘ —> 2Cr3+ (aq) + 7H20(l) b. Cr2072‘(aq) +14H+(aq) —+ 2Cr3+ (aq) +_ 7H20(l) + 6e' - 0- 2C1' (aq) ——> C12 (aq) + 2e" (1. C12 (aq) + 26‘ —) 2C1" (aq) . Write a balanced net ionic equation for the reaction of CdC12(aq) with NaZS(aq) . a. CdC12(aq) +-NaZS(aq) —) CdS(aq) + 2NaCl(aq) b. Cd2+ (aq) + 2Cl' (aq) + 2Na+ (aq) + 82' (aq) ——> CdS(s) + 2NaCl(aq) ’ c. Cd2+ (aq) + 32" (aq) —> CdS(s) d Cd2+ (aq) + 2C1' (aq) + 2Na+ (aq) + 82‘ (aq) —-) CdS(s) + 2Na+ (aq) ...
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