# Workshop 6 answer - Exothermic reaction energy of product...

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NAMES: ____________________________________________________________________________________________ WORKSHOP 6 Practice for exam 2 Spring 2011 1. If I increase the pressure of a sample of argon at constant 298 K, the average speed of a molecule will 1. increase 2. decrease 3. stay the same correct 2. If carbon dioxide at a constant 298K is compressed from 1atm to 10 atm pressue, what happens to the energy? 1. increase 2. decrease 3. stay the same correct 3. For exothermic combustion of methane, The energy of the system ? a. Increases and Q>0 b. Decreases and Q,<0 CORRECT 4. Consider making ammonia: N 2 (g) + 3H 2 (g) 2NH 3 (g) To make ammonia this way the system gives off 46KJ of heat for every mole of ammonia formed. If 28g of nitrogen were consumed making ammonia, Q would be : a. 92 kj b. -92 kj correct c. 46kj d. -46kj 5. Consider the reaction for the formation of water :

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H 2 (g) + 1/2O 2 (g) H 2 O(g) ΔH= -242 kJ a. Is the energy of the product higher or lower than that of the reactants?
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Unformatted text preview: Exothermic reaction . energy of product is lower than reactants. b. Does the system do pressure-volume work, or is work done on the system > If so, what is the sign of the work? Gas is compressed. You have one and a half mole of reactants to give 1 mole of the product. Means volume is less. Gas is compressed. Work done on the system + sign. W= PΔV 6. Arrange the following N 2 , NH 3 , N 2 O 4 , N 2 O, N 2 H 4 , NO − 3 in order of decreasing oxidation number of the nitrogen atom. NO − 3 , N 2 O 4 , N 2 O, N 2 , N 2 H 4 , NH 3 7. Write the formula unit equation for this reaction occurring in water: Calcium sulfide and iron(II) bromide are mixed to form iron(II)sulfide and calcium bromide. CaS(aq) + FeBr 2 (aq) → FeS(s) + CaBr 2 (aq) 8. Which reactants will generate a precipitated product? 1. NaH + H 2 O 2. FeCl 2 + Na 2 SO 4 3. BaCl 2 + Na 2 SO 4 correct 4. (NH 4 ) 2 SO 4 + KOH 5. AgNO 3 + CH 3 COONa...
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## This note was uploaded on 04/21/2011 for the course CHEM 102 taught by Professor Peterpastos during the Spring '08 term at CUNY Hunter.

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Workshop 6 answer - Exothermic reaction energy of product...

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