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Showing revision 4
Part I : Answer the following showing all work and/or in a clear and concise manner.
1) In Thermodynamics, what is the difference between the system and the surroundings?
2) What is heat and give three different units for heat?
3) What is the definition of activation energy (Eac)?
4) Potential energy of the reactant (PEr) is _________ compared to the potential energy of the product (PEp) in an Exothermic rxn.
5) ___________________ is the average kinetic energy of all the particles in a substance.
6) State "our" definition of the 2nd Law of Thermodynamics.
7) Absolute zero is the condition where __________________________. The parts of the condition of absolute zero is _________________ and _________________.
8) Entropy is the measurement of _______________________________ or of energy _________.
9) If a system (for example water) has a delta H that is "-", the system (i.e. water) would be releasing or absorbing energy/heat? Circle correct answer.
10) How does the concept of Entropy affect or explain one or more of the conditions for absolute zero? (3rd Law of Thermodynamics)?
11) Explain the difference between a Relative temperature scale (i.e. Celsius) and Absolute temperature scale (i.e. Kelvin).
12) If you have substance at a specific temperature, which temperature value will always be Greater than the other, Celsius or Kelvin?
13) "Ambient temperature" is the name scientist use to express "normal" room temperature, if that is 20.0°C, how is the temperature value in K?
14) Someone stated that "energy was lost in the chemical reaction". State if you agree or disagree with that statement. Justify your answer using your knowledge of Thermo.
15) What is the Activated complex?
15). What type of energies compose Enthalpy?
16) On the back of this sheet, draw the Potential Energy (PE) Diagram including showing appropriate axes, Potential energy (also called enthalpy) of Reactants, Potential energy (also called enthalpy) of the products, location and Potential energy of the Activated completed, Heat of Reaction (also called Enthalpy Change of the Reaction). What sign of ΔHrxn for this Endothermic reaction.