Answer Happy

2 2 0/1.75 points Use the dropdown boxes below to provide the general correlation between impurities and melting point. (Fill in the Blank Dropdown: All portions of the dropdown require a selection, and all dropdowns must be correct to receive credit) Adding an impurity to a pure solid will typically raise and narrow the melting range.
What is the predominant reason that 2-napthol has a higher melting point than naphthalene? OH Naphthalene 2-Naphthol mp = 120-122°C mp = 80-82°C (Multiple Choice: Only one answer is correct, and only one answer can be selected) Surface Area Symmetry Polarity / Hydrogen Bonding
You suspect a given substance, unknown X, to be either pure acetaminophen (melting point = 169°C) or pure 1,4-dihydroxybenzene (melting point - 172°C). Subsequently, you perform a mixed melting point analysis by making the following three samples that yield the results below: Unknow X alone yielded a melting range of 162-166°C Unknown X mixed in a 50/50 ratio with acetaminophen yielded a melting range of 165-168°C Unknown X mixed in a 50/50 ratio with 1,4-dihydroxybenzene yielded a melting range of 153-160°C Given the data above, what is the identity of unknown X? . (Multiple Choice: Only one answer is correct, and only one answer can be selected) 1.4-Dihydroxybenzene Neither acetaminophen or 1,4-dihydroxybenzene A mixture of acetaminophen and 1,4-dihydroxybenzene Acetaminophen
Given the TLC (thin layer chromatography) plate below determine the approximate Ry value for "Known Compound C." . • The following TLC plate has been fully developed and marked so that all spots are indicated. The stationary phase of the TLC plate is composed of relatively polar silica gel. In other words, a standard stationary phase is being used. • The "starting line" represents where a given compound or multiple compounds have been spotted before development of the TLC plate (see key). . The "solvent front" represents the distance traveled by the eluent (solvent) up the TLC plate. Solvent Front Symbol Designation Unknown B Known Compound A Known Compound B Known Compound Known Compound D c. 5 1 4 3 1 2 Starting Line U А B C D Ocm 1