1. An organic student did an experiment extracting benzoic acid from a mixture of other organic substances. Other analyses of the obtained sample confirmed the presence of benzoic acid. The student also measured the melting point of the white solid, 117.4-121.6 oC. The literature mp of benzoic acid is 122.3oC. What can you conclude about the sample? Select one. Group of answer choices The sample of benzoic acid contains soluble impurities. The student obtained a good yield of benzoic acid. The sample of benzoic acid contains insoluble impurities. The student obtained pure benzoic acid from the extraction. The student obtained a poor yield of benzoic acid.
1. An organic student did an experiment extracting benzoic acid from a mixture of other organic substances. Other analyses of the obtained sample confirmed the presence of benzoic acid. The student also measured the melting point of the white solid, 117.4-121.6 oC. The literature mp of benzoic acid is 122.3oC. What can you conclude about the sample? Select one.
Group of answer choices
The sample of benzoic acid contains soluble impurities.
The student obtained a good yield of benzoic acid.
The sample of benzoic acid contains insoluble impurities.
The student obtained pure benzoic acid from the extraction.
The student obtained a poor yield of benzoic acid.
2. Which phenomenon are sometimes confused with melting during mp analysis?
Select all that apply.
Group of answer choices
decomposition
cracking
shaking
sagging/shrinking
sweating
solidifying
3. Study the bond types in the compound shown. Select the type(s) of intramolecular force(s) you predict the substance to exhibit.
Select all that apply.
CH3CH2CH(NH2)CH2CH3
Group of answer choices
Dipole-dipole forces
London dispersion forces (or VdW)
Hydrogen bonding forces
Ion-dipole forces
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