EBK A SMALL SCALE APPROACH TO ORGANIC L
4th Edition
ISBN: 9781305446021
Author: Lampman
Publisher: CENGAGE LEARNING - CONSIGNMENT
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A student obtained a solid product in a laboratory synthesis. To verify the identity of the
solid, she measured its melting point and found that the material melted over a 12°C
range. After it had cooled, she measured the melting point of the same sample again and found that this time the solid had a sharp melting point at the temperature that is
characteristic of the desired product. Why were the two melting points different? What was responsible for the change in the melting point?
Write the ions present in solution of Sn(NO2)4.Express your answers as chemical formulas separated by a comma (NO spaces!).Identify all of the phases in your answer (e.g. NO3-(aq),Cu2+(aq) )
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Write the ions present in solution of NaHCO3.Express your answers as chemical formulas separated by a comma (NO spaces!).Identify all of the phases in your answer (e.g. NO3-(aq),Cu2+(aq) )
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Even salts that are classified as "insoluble" according to the solubility rules will dissolve a small amount in water. Write the ions present in solution of CaSO4.Express your answers as chemical formulas separated by a comma (NO spaces!).Identify all of the phases in your answer (e.g. NO3-(aq),Cu2+(aq) )
Sulfur exhibits two solid phases, rhombic and monoclinic. Use the accompanying phase diagram for sulfur given below to answer the questions that follow.
(A). How many triple points are in the phase diagram?
(B). What phases are in equilibrium at the topmost triple point?
(C). How many phase transitions are there when rhombic sulfur at 1 atm and 80°C is heated to 500°C at constant pressure?
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- Melting point of a compound is lowered when an impurity is introduced. However 1:1 mixture of A and B (benzene, mp = 5.5 °C and hexafluorobenzene, mp = 5.2 °C) leads to an elevation in melting point; the mixture melts at 23.7 °C. Provide explanation in case of impurity and 1:1 mixture of A and B. 8.arrow_forwardPure naphthalene melts at 80 °C. Pure I-naphthol melts at 123°C. All mixtures of these two components show a single peak when heated and a 50 mol% mixture shows a single broad peak around 100 °C. What type of phase diagram does this suggest? Draw a hypothetical example of this type of phase diagram.arrow_forward8. The diagram below is an example of Liquid-Solid-Temperature Composition Phase Diagram of Partially Miscible Solids.The left vertical line is B rich while the right vertical line is A-rich.Define the phases present in the region A to F. LS – TZ Phase Diagram: Partially Miscible Solids T= Tm This type of mixture is for partially miscible solids At the solid region: • The B- rich region, or the ß phase T • The A- rich region, or the a phase At each single solid- phase region, there are 2 different forms of the solid solution. T = T T = Teu Lever Rule applies to all 2– phase regions. E Zaarrow_forward
- Explain how vacancies are introduced in a solid NaCl crystal when a compound containing cation of higher valence is added to it.arrow_forwardWhich of the following phase diagrams corresponds to a system wherein the upper critical temperature is less than the boiling point at all compositions? A C E D Barrow_forwarda student obtained a solid product in a laboratory synthesis. to verify the identity of the solid, she measured its melting point and found that the material melted over a 12°C range. After it had cooled, she measured the melting point of the same sample again and found that this sharp melting point at the temperature that is characteristic of the desire product. why were the two melting point different? what was responsible for the change in the melting point?arrow_forward
- Calculate the cryoscopic and ebullioscopic constants for liquid bromine, Br2. You will need the following data: 8.89 K/molal (Kf); 4.95 K/molal (Kb)ΔfusH: 10.57 kJ/mol; MP: 27.2°CΔvapH: 29.56 kJ/mol; BP: 58.78°Carrow_forwardAromatic compound naphthalene melts sharply at 79–81 °C. The melting range will be significantly depressed when very small amounts of impurities are present. Investigate the structure of naphthalene and propose an explanation of why very minor impurities have a very significantly disrupt formation of crystals.arrow_forwardA solution of acetic acid (CH₂COOH) and water is boiling at 103.1 °C. A sample of the vapor above the solution is cooled until it condenses. This condensed sample is analyzed, and turns out to be 50.% acetic acid by mass. Calculate the percent by mass of acetic acid in the boiling solution. Here's some data you may need: acetic acid water [% normal boiling point 118. °C 100. °C density 1.1 g mL 1.00- mL vapor pressure at 103.1 °C X 568. torr Be sure your answer has the correct number of significant digits. Note for advanced students: you may assume the solution and vapor above it are ideal. 846. torr 5 ? 區 olo Ararrow_forward
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