● 4. There's no way we can make any broad assumption about melting points. That's like saying "all alcohols should melt at X °C". ● 5. Hydrates are just like any other compound; they can have higher or lower melting points, depending on their structures. The only compounds that have melting points that are always "extremely high" are salts (ionic compounds). ● ● Question 17 ● 6 out of 6 points ● ● ● ● You look up the melting point of serine (an amino acid) in the CRC Handbook and it reads, "228d". What does that reported melting point mean? ● ● ● ● ● ● ●
● Selected Answer: ● "d" stands for decomposition ● Answer Feedback: ● A "d" indicates that the sample decomposes (turns a darker color) at the given temperature. Some organic compounds are not stable and will break down before reaching their melting point. ● ● Response Feedback: ● All temperatures given in the CRC are in degrees Celcius (just a "228" would imply 228 °C). (Degrees Farenheit are not typically used in scientific literature.) ● STP (standard temperature and pressure) of the surroundings have no significant effect on the mp measurement. ●
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