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 / +ΔS ALWAYS be spontaneous!

+ΔH / + ΔS Spontaneous at HIGH Temperatures

+ ΔH / – ΔS ALWAYS NONSPONTANEOUS.

-ΔH / -ΔS Spontaneous 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