24. Ethanol, C2H;OH, and propane, C3H8, have approximately the same molar mass, yet ethanol has a much higher boiling point. Briefly explain why.
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- At a pH of 7.40, the carbonic acid ratio is ________. a. 35:1 b. 4:1 c. 20:1 d. 3:1Compare the densities of low-density polyethylene (LDPE) and high-density poly- ethylene (HDPE) with the densities of the liquid alkanes.How might you account for the differences between them?Carbon dioxide is dissolved in blood (pH 7.4) to form a mixture of carbonicacid and bicarbonate. Neglecting free CO2, what fraction will be present as carbonic acid? Would you expect a significant amount of carbonate (CO32-)?
- 4. Some antacids will generate carbon dioxide, CO2, when they neutralize the acid in gastric juice. Write the net ionic equation for the reaction of the antacid containing the anion carbonate, CO3 , or the anion bicarbonate, HCO3, with acid (H+). 5. Write the net ionic equation for the neutralization of the bases, magnesium hydroxide, Mg(OH)2, and aluminum hydroxide, Al(OH)3, found in Maalox, for example, with acid (H*).1. Choose the formula for threonine: a) CH₂ -CH-COOH OH NH₂ b) CH3 -CH-CH-COOH OH NH₂1. which IR stretches and bends indicate what type of functional group we have (alcohol, carboxylic acid, ester), 2. how you can then use IR to monitor the change from the starting materials to the products. 3. indicate and discussion the absorptions that are relevant to alcohol OH and C-O, carboxylic acid OH, carboxylic acid C=O, ester C=O, and C-O). the picture below is an ir spectra of ethanol
- Trans-oleic acid (18:1,D9) has a melting temperature of (44.5C) and cis-oleic acid (18:1,D9) has a melting point of (13.4C). Briefly explain the difference in melting points between the two. tw.29. A topical solution contains 3% w/v hydro- quinone. How many liters of the solution can be prepared from 30 g of hydroqui- none? 29. 1 liter1-34. Indicate whether each of the following statements about enantiomers is true or false. (a to d)
- 3). reactions of the following alkyl iodide. Danny uses potassium tert-butoxide to promote the reaction while Claire uses water and high temperatures. One of their reactions has provided a single elimination isomer while the other has provided a mixture of elimination isomers. Organic chemistry students Danny and Claire are both performing elimination Me H20, heat Danny's Reaction Claire's Reaction H. Me a) Which student's reaction (Danny or Claire) has provided a single elimination isomer? b) Draw all the elimination isomers obtained from both students' reactions. c) Which of the dienes drawn (by you) in question 3b is the most stable? Circle that diene above.1. Rank the following amines from lowest to highest boiling point. Explain your reasoning. CH3 CH2CH3 H3C CH3 ༣.མིའི་ན་བྱིན་ CH NH₂ -CH3 H₂ NH2 2. Which compound in each pair would have the higher boiling point? Why? a. H3C CH3 H3C OH b. NH2 CH3 H₂ H3C CH CH CH3 H3C -CH3 NH2 3. Circle each of the following molecules that would be significantly soluble in water. Explain. ΝΗΣ H₂ H₂ H₂ H₂ CH C- NH₂ H3C -CH3 H3C H2 H₂ CH3 CH CH3 H3C -CH3 H3C H₂1) Determine the functional group(s) in the compound having the following IR spectrum. 2) Identify the diagnotic signal(s) , explain what led you to this conclusion.