Macroscale and Microscale Organic Experiments
7th Edition
ISBN: 9781305577190
Author: Kenneth L. Williamson, Katherine M. Masters
Publisher: Brooks Cole
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Textbook Question
Chapter 3, Problem 9Q
You have an unknown with an observed melting point of
Is your unknown compound A with a reported melting point of
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4. A student has an unknown with an observed melting point of 82.5 °C -86 °C. Is it
Compound X with a reported melting point of 84.5 °C - 85 °C, Compound Y with a
reported melting point of 83. °C – 84 °C or Compound Z with a reported melting point of
88 °C – 89 °C. Explain your reasoning.
Three samples labelled A,B, and C possess identical melting points: 99 degrees. When a 75/25 mixture of A and B is prepared, it’s melting point is 90-95 degrees. The melting point of a 50/50 mixture of A and C is 79-91 degrees. The melting point of a 25/75 mixture of B and C is 97-98 degrees. What information does this tell you about the identity of the 3 compounds? What would you expect an an approximate melting range for a 75/25 mixture of B and C?
Rank the following compounds from HIGHEST to LOWEST melting point and explain
why they are in that order.
CH3F CaF2 CH3OH KF F2
Chapter 3 Solutions
Macroscale and Microscale Organic Experiments
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- What type of compound is this? H CH, C-N-CH₂arrow_forwardCircle the compound with the highest melting point. Indicate the compound with the lowest melting point.arrow_forwardGiven the information listed below, identify the compound. Physical description: This substance is a colorless but fragrant liquid that is oily in appearance. Chemical information: Observed Melting point: -78.5 °C Observed Boiling point: 138-142 °C Calculated MW: 130 g/mol Density: 0.876 g/cm3 Solubility in water: Minimally soluble, Other: Flash Point: 77 °F Spectroscopic information: IR bands indicate this compound contains C-H functionalities and the appearance of a strong stretch near 1700 cm-1 as well as several strong bands between 1500 and 1000 cm-1. The C-13 NMR spectrum for this compound indicates 6 unique carbon atoms and no cyclic structure. The proton NMR data indicate 5 sets of unique protons. C-13 NMR data of : PPM: 171.08, 63.13, 37.48, 25.18, 22.51, 20.96 Int: 222, 887, 645, 635, 1000, 473 Assign: 1, 2, 3, 4, 5, 6 H-1 NMR Assign: A, B, C, D, E Shift: 4.095, 2.037, 1.693, 1.521, 0.926arrow_forward
- 5. Ftorotane is: A) Transparent colorless crystals with a characteristic odor B) Transparent colorless liquid with a pungent odor C) Transparent, colorless, heavy, highly volatile liquid; not flammable D) Colorless or pale yellow oily liquid; practically immiscible with water.arrow_forwardIf a sample of benzoic acid (m.p. 121-122 degree C) was contaminated with a small amount of phenol (m.p. 40-42 degree C) , its melting point range would be observed : higher than 121-122 degree C and have a narrow range raised higher than 121-122 degree C and have a broad range lower than 121-122 degree C and have a narrow range lower than 121 -122 degree C and have a broad range O000arrow_forwardWhich of the following statements about molecules A-D is false? OH HO. HO Br HO HO.. OH HO Br Br Br Br Br Br Br A D. Molecule A and molecule B have the same boiling point A 50:50 mixture of molecules A and B is optically inactive OA solution of molecule D rotates plane-polarized light Molecule B and molecule C have different boiling pointsarrow_forward
- An experiment was carried out to separate a mixture containing the following. Boiling Point Methyl Alcohol- 65 Ethyl Alcohol- 78 Toluene-114 Which component would be first to separate out?arrow_forwardN CH3 K₂Cr₂O7 H* Iarrow_forwardIdentify the compound which has the highest boiling point.arrow_forward
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