CHAPTER 23- ENTROPY AND GIBBS FREE ENERGY 🤎 Flashcards
(related to chapter 19)
State and explain two factors affecting entropy
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State the three conditions that must be met to make comparisons of entropy values
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Define entropy and a spontaneous reaction, explain what the surroundings of a system are
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Define the standard molar entropy & write a symbol that represents this concept, state it’s units, state whether this is positive or negative
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Explain IN DETAIL the changes of entropy that occur during: a change in state (use a graph in your explanation), a temperature change, a change in the number of gaseous molecules, state how entropy increases in gases when both reactant and product molecules are gases
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Explain the relationship between stability, disorder of a system and entropy
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AS level recap- define an exothermic and endothermic reaction
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Using an identified equation equation, calculate the entropy change of a system using the example in your notes, what is the meaning of a negative and positive value of the entropy of a system?
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Draw and explain how the entropy changes as and equilibrium reaction progresses
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Write an equation for calculating the enthalpy change of surroundings & it’s units, state the effect of temperature on this enthalpy change and explain how to predict whether a reaction will be spontaneous or not
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Define Gibbs free energy, write an equation for calculating Gibbs free energy (Gibbs equation) & it’s units
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Define a spontaneous reaction, state what what happen for a reaction to be spontaneous, explain the effect of feasibility on the value of Gibbs free energy
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What is the standard molar Gibbs free energy of formation? state it’s units
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State the equation for the Gibbs free energy change, calculate this change using energy cycles if necessary (use the four examples in your notes)
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Using a relevant equation, predicting the effect of temperature change on the feasibility of an exothermic and endothermic reaction (explain this in detail)
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