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This 3 page Class Notes was uploaded by Peggie Leffler on Saturday October 3, 2015. The Class Notes belongs to CHM122 at California State Polytechnic University taught by TimothyCorcoran in Fall. Since its upload, it has received 34 views. For similar materials see /class/218225/chm122-california-state-polytechnic-university in Chemistry and Biochemistry at California State Polytechnic University.
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Date Created: 10/03/15
Kelly Linck Colleen Tin CHM122 Dr Corcoran 1 N 9 P Uquot 0 l 00 Mock Midterm 2 What is exchanged in an open system mass ll nothing lll energy a only b ll only c l and Ill d lll only A dinner roll has a mass of 629 g and is flying across a room at a velocity of 3410 cms What is its kinetic energy How much heat needs to be added to 25 L of water already at 100 C to convert it to H20 9 True or False Temperature is the same thing as thermal energy Calculate the value of the standard enthalpy of the following reaction AH 239 20F2ltggt gt 3029 SF4lt9gt from the following enthalpy changes OF2g H200 gt 029 2HF9 AH 277 kJ SF49 2H20 gt 8029 4HFQ AH 828 kJ 39 029 gt 8029 AH 297 kJ What does a buffer solution consist of a a weak acid and the salt of a weak acid b a weak base and the salt of a weak acid c a weak acid and the salt of a weak base d a weak base and the salt of a weak base e either a or d Calculate the pH of a buffer solution made from 019 M HC2H302 and 047 M C2H30239 The Ka for HC2H302 is 18 x105 Which of the following processes are spontaneous l Boiling of Water at 50 C and 1 atm ll Dissolving a sugar cube in hot coffee III the flow of heat from a cold object to a hot object IV uniform mixture of bromine vapor and nitrogen gas a I only b II and III c II only d II and IV e I II III and IV Predict the sign of A8 for each of the following equations a Mg s C2 g gt MgC2 s b N2 9 3H2 g gt 2NH3 9 c 2H3O aq C03239aq gt C02 g 3H20 I A 0 You have a buffer solution containing 60 mL of 0450 M HC3H502 Ka 130 x 1039s and 60 mL of 0450 M NaC3H502 To it you add 0003 moles of HNO3 Assume that the nitric acid has no effect on the volume 11 Calculate the standard entropy of the reaction at 25 C CO 9 3H2 g 6 CH4 9 H20 9 CO g AS 1976 JKx moI H2 g AS 1306 JKx moI CH4 g AS 1862 JKx moI H20 I AS 1887 JKx moI 12 Calculate the standard Gibbs free energy AG X of the following reaction at 25 C N2ltggt 3H2g 8 2 H 39 13 True or False The entropy of the universe increases in a spontaneous process and remains unchanged in an equilibrium process A A It takes 4875 J to heat 0025 kg of copper from 308 K to 358 K What is the specific heat in Joulesg C Answer Key 1 e and 111 mass and Energy 2 E Varer H mm 629 kg34 1 rns2 BBB kg rrFs1 SEE J luunrnL L0 1 1110 4411 3 Z39OLX 1L X xxsu 1 17111 4900 4 Fa1se Temperature 1 a measure unnerrna1energy 5 H 1 r 1 L 1 L 1 a e enneraeru 7 pH 514 usmg the HendersuwHasse bath Equatmn a a 11 anm a a Jnegauve b Jnegatwe pus1t1ve 1D pH 4 7a 11 7214 5 JKx rne1 32 a 1 14 El 39 Jg C
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