Problem 83
Clean Skin Disposable wipes used to clean the skin prior to getting an immunization shot contain ethanol. After wiping your arm, your skin feels cold. Why?
Problem 91
Explain why carboxylic acids tend to be more soluble in water than aldehydes with the same number of carbon
Problem 95
Can we use combustion analysis to distinguish between ketones and aldehydes with the same number of carbon atoms?
Problem 96
Can we use combustion analysis to distinguish between ethers and ketones with the same number of carbon atoms?
Problem 99
What distinguishes an amine from an amide?
Problem 100
Explain why nylon reacts with acid, whereas polyethylene is inert toward acid.
Problem 113
Consult tables of thermochemical data in Appendix 4 for any values you may need to solve Problems 19.111 through 19.114 Calculate \(\Delta H_{\mathrm{mn}}^{\circ}\) for the following reactions of methanogenic bacteria, given $$\Delta H_{f, \mathrm{HCOOH}}^{\circ}=-425.0 \mathrm{kJ} / \mathrm{mol}$$ (1) \(\quad \mathrm{CH}_{3} \mathrm{COOH}(\ell) \rightarrow \mathrm{CH}_{4}(g)+\mathrm{CO}_{2}(g)\) (2) \(4 \mathrm{HCOOH}(\ell) \rightarrow \mathrm{CH}_{4}(g)+3 \mathrm{CO}_{2}(g)+2 \mathrm{H}_{2} \mathrm{O}(\ell)\)
Problem 114
Consult tables of thermochemical data in Appendix 4 for any values you may need to solve Problems 19.111 through 19.114 Calculate \(\Delta H_{\mathrm{mn}}^{\circ}\) for the following reactions of methanogenic bacteria: (1) \(4 \mathrm{H}_{2}(g)+\mathrm{CO}_{2}(g) \rightarrow \mathrm{CH}_{4}(g)+2 \mathrm{H}_{2} \mathrm{O}(\ell)\) (2) \(\quad 4 \mathrm{CH}_{3} \mathrm{OH}(\ell) \rightarrow 3 \mathrm{CH}_{4}(g)+\mathrm{CO}_{2}(g)+2 \mathrm{H}_{2} \mathrm{O}(\ell)\)
Problem 119
Can all of the terms enantiomer, achiral, and optically active be used to describe a single compound? Explain.
Problem 120
Could a racemic mixture be distinguished from an achiral compound based on optical activity? Explain your answer.
