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Chapter 23 Text Review QuestionsPowerPoint Presentation

Chapter 23 Text Review Questions

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### Chapter 23 Text Review Questions

Answers

CH 23 TEXT #1-26 KEY

- 1.B 9. POSITIVE
- 2.B 10. ENTROPY & ENTHALPY
- 3.A 11. TRUE
- 4.C 12 IS NONSPONTANEOUS
- 5.A 13. ΔH
- 6.C 14. TEMPERATURE
- 7.A 15 Keq << 1
- 8.C 16.LESS

Ch Review Questions

- 17. A spontaneous rxn is one that proceeds on its own without outside intervention
- 18. Quantitative measure of disorder of substances involved in a reaction. Solids changing to liquids and combustion of fuels.

ΔG = ΔH - T ΔS

#19.

- ΔH / +ΔSALWAYS be spontaneous!

+ΔH / + ΔSSpontaneous at HIGH Temperatures

+ ΔH / – ΔSALWAYS NONSPONTANEOUS.

-ΔH / -ΔSSpontaneous at LOW Temperatures

Ch Review Questions

- 20. Free energy incorporates both entropy and enthalpy. It determines a reaction’s spontaneity. Spontaneous rxns have negative free energy values
- 21. ΔG = ΔH - T ΔSAt high temps the T ΔSterm will cause ΔG to be negative. The driving force is only entropy. Entropy increases as temp increases.

Ch Review Questions

- 22. a) + b) - c) +
- 23.
- a) + ; depends on values of S,H, and T
- b) +; spontaneous
- c) +; spontaneous
- 24. OMIT

Ch Review Questions

- 25. a) - b) - c) -
- 26. a) + b) - c) –
- END CHAPTER REVIEW QUESTIONS

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