prequiz1r.125

prequiz1r.125 - (Show all work.) H S O 4 & 5....

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Dr. Zellmer Chemistry 125 Thursday Time: 30 mins Winter Quarter 2012 January 5, 2012 Pre-quiz Name Rec. TA/time ---------------------------------------------------------------------------------------------------------------------------------------- Show ALL your work or EXPLAIN to receive full credit. R = 0.08206 L C atm/mol C K = 8.314 J/mol C K 1. (7 pts) The amount of NO 2 in the air on a particular day is 1.55 x 10 ! 6 kg/m 3 . How many pounds of NO 2 are present in 2.00 ft 3 ? (1 in = 2.54 cm, 1.000 lb = 453.6 g) (You MUST use dimensional analysis to receive full credit !) 2. (8 pts) A quantity of heat equal to 600.0 cal is ADDED to 40.0 g of water at an initial temperature of 35.0 o C. Calculate the FINAL temperature (in o C). (The specific heat of water is 1.00 cal/g C °C) Show your work . Copyright R. J. Zellmer, January 5, 2012 OVER . ..
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3. (3 pts) Correctly name or write the formulas for the following compounds. Also , are they ionic or molecular? Chromium (VI) oxide K 3 PO 4 P 2 O 5 4. (2 pts) Determine the oxidation number of the underlined element in the following compound.
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Unformatted text preview: (Show all work.) H S O 4 & 5. (2 pts) In the following reaction, which element is being oxidized and which is being reduced? Cu(s) + 4 HNO 3 (aq) v Cu(NO 3 ) 2 (aq) + 2 H 2 O( R ) + 2 NO 2 (g) 6. (2 pts) Internal energy, E, is a state function . What does this mean? Copyright R. J. Zellmer, January 5, 2012 7. (3 pts) The standard enthalpies of formation, ) H f , at 25C for SO 2 (g) and SO 3 (g) are -296.9 kJ/mol and -395.2 kJ/mol, respectively. What is the enthalpy of reaction, ) H AND is the reaction endothermic or exothermic? 2 SO 2 (g) + O 2 (g) v 2 SO 3 (g) 8. (12 pts) Consider the following molecules and list their molecular shapes (NOT the electron domain geometries) and whether they are polar or nonpolar. Provide a short explanation for your choices. H 2 S BH 3 NF 3 CH 3 Cl 9. (1 pt) What volume (in mL) of a 5.0 M NaCl solution is needed to make 500.0 mL of a 2.0 M NaCl? Copyright R. J. Zellmer, January 5, 2012 OVER . .....
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prequiz1r.125 - (Show all work.) H S O 4 & 5....

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