124Workbook2011-4

124Workbook2011-4 - Chem124 Fall2011 Dr.Neff...

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Chem 124 Fall 2011 Dr. Neff Chem 124 Workbook I recommend printing this out in sections rather than printing the entire document at once. You will work on some of these problems with your partner in class, so you should bring this workbook to every class. We will go over some problems together as a group, and solutions to some of the other problems MAY be posted online. Problems like these, as well as the suggested text problems, could show up on quizzes and/or exams. NOTE that you should work these out in your notebooks – there isn’t necessarily enough space to work the problems on these pages.
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Chem 124 Fall 2011 Dr. Neff Thermochemistry  Read in Chapters 6, 12 and 20 as listed on online syllabus. Useful Equations that you need to memorize! E = q + w ( ατχονσταντΠρεσσυρε, Ε= Η+Π ς ) q = mc T    q = n H Η ρξν ο = Σ ν φ ο (προδυχτσ29- Σ ο (ρεαχταντσ29 Σ ο Σ ο Σ ο Γ ο Σ ο Σ ο G =  H - T S Most Constants will be given to you on quizzes and exams – but you need to  memorize c for water(l) = 4.184 J/g˚C workbook can be found in text or online Substance Specific Heat, J/g•K Al 0.900 Fe 0.450 Cu 0.387 Au 0.129 ∆Η fusion of water = 6.02 kJ/mol ∆Η vaporization of water = 40.7 kJ/mol Internal Energy, Calorimetry, Enthalpy, Phase Changes :
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Chem 124 Fall 2011 Dr. Neff 1. What are the two main components of internal energy of a substance? What are the symbols for internal energy and its two components? 2. A system which undergoes an adiabatic change is one in which no heat is transferred. For an adiabatic change that does work on its surroundings, indicate if q, w and E for such a process should be positive, negative, or equal to zero. Explain. 3. For each of the following, define the system and the surroundings, and indicate the direction of heat transfer. a) Natural gas is burned in a gas furnace in your home. b) Water drops, sitting on your skin after a dip in the pool, evaporate. 4. If you pour hot tea over a cup of ice, what are all the factors that will affect the final temperature of the mixture? 5. Does a negative H rxn mean that the heat of reaction can be thought of as a reactant or a product? 6. a) What is the difference between an endothermic and an exothermic reaction or process? How does this relate to the sign of the enthalpy change for each process? b) Would the products or reactants of an exothermic reaction have higher thermal energy on
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124Workbook2011-4 - Chem124 Fall2011 Dr.Neff...

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