A student measured the melting point range of an unknown solid to be 81.9 to 82.3 degrees celsius. a) Is the compound pure? b) Can you identify the compound from Table 2.2? c) If yes, what is the compound? Table 2.2: Solid - Melting Point (Celsius) Benzoic Acid - 122 Acentanilide - 114 Acetamide - 82 Biphenyl - 71 p-Dimethoxybenzene - 59 p-Dichlorobenzene - 54 Benzophenone - 48

A student measured the melting point range of an unknown solid to be 81.9 to 82.3 degrees celsius. a) Is the compound pure? b) Can you identify the compound from Table 2.2? c) If yes, what is the compound? Table 2.2: Solid - Melting Point (Celsius) Benzoic Acid - 122 Acentanilide - 114 Acetamide - 82 Biphenyl - 71 p-Dimethoxybenzene - 59 p-Dichlorobenzene - 54 Benzophenone - 48

Introductory Chemistry: A Foundation

9th Edition

ISBN:9781337399425

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter15: Solutions

Section: Chapter Questions

Problem 1QAP: solution is a homogeneous mixture. Can you give an example of a gaseous homogeneous mixture? A...

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solution is a homogeneous mixture. Can you give an example of a gaseous homogeneous mixture? A liquid homogeneous mixture? A solid homogeneous mixture?
What is the melting point range for both Salicylic acid and Aspirin? When I found online, different websites have different melting point range. For Salicylic acid, the melting point range I found is 158-161 Or 157- 159 degrees Celsius. For Aspirin, I found it to be 134-136 or 138-140 degrees Celsius. Which range is more "correct" ?
120- 90 60 30 Time (minutes) 90 What is the melting point of the following substances? Temperature ( C)
A sample of 75 mg of adipic acid and 75 mg of salicylic acid was dissolved in boiling water. The solution was slowly cooled to room temperature and then cooled further in an ice bath. The mass of the resulting crop was 125 mg. The melting point of the resulting crop was 124.0 - 142.1 oC (Refer to table E5.4). What is the amount of adipic acid in the crop? Group of answer choices 60 mg 50 mg 90 mg 75 mg
At 1 atm, a mixture of octane and methylbenzene boils at 135.8 degrees Celsius with a composition of 60% methylbenzene. The boiling points of methylbenzene and octane are 110.6 and 125.6 degrees Celsius, respectively. Draw a boiling point-composition diagram for the octane-methylbenzene mixture system, including all significant labels.
Masses of compounds used and observations NaCI CuSO4-5H20 Bright blue crystaline solids (NH4)2Fe(SO4)2 pale, Blue-green crystalline solid colorless Crystals Appearance of solid Mass of vial and 12.8364 12.7398 12.9445 compound (g) Mass of emptied vial (g) 11.6023 11.4888 11.9221 Mass of compound used (g) 1.2341. 1.2510. 1.0224 Volume of prepared solution = Type response here. Mass of sodium chloride used = Type response here.
Q1/Why do we use oil instead of water to determine the melting point of chemicals? Q2/What is the reason for the variation in the measured melting point of the same chemical? Q3/What is the best type of oil used to measure the melting point of chemicals? Why?
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 material melted over a 12 celcius range. After it has cooled, she measured the melting point of the same sample again and found that this time the solid had a sharp melting point. A material is said to have a sharp melting point if the range is less than 5 celcius, and a material is said to have a broad melting point if the range is greater than about 5 celcius. Pure compounds characteristically have a sharp melting range while most mixed or impure compounds have a broad melting range. Why there are the two melting points?
A student measured the boiling point of an unknown liquid to be 82.9 degrees celsius. After consulting Table 2.1, this liquid is probably __________. Is the liquid pure? Why or why not? Table 2.1 Liquid - Boiling point (Celsius) Isopropyl alcohol - 82 Ethyl acetate - 77 Methyl cyclopentane - 72 Methanol - 65 Acetone - 56 Cyclopentane - 49
A group of students performed a melting point experiment to study the physical properties of ionic and covalent solids. The data collected are shown in the table. Solid Sample Melting Point (oC) Time Elapsed (min) Table Sugar (sucrose) 186 18 Table Salt (sodium chloride) 500 (not observed) 30 Paraffin Wax 37 4 Vegetable Lard 50 >5 Using the information contained in the table, what is the BEST explanation for the results?A The melting point of sodium chloride was not observed because ionic solids do not melt, whereas sugar, wax, and lard melted because they are softer than salt.B The melting points of covalently bonded solids tend to be lower than ionic solids. The melting point of sucrose was greater than the wax or the lard because sucrose has stronger bonds than wax or lard.C The melting point of sodium chloride was not observed because ionic solids are composed of positive and negative ions that do not melt; whereas, the…
Part 2 Pour the six liquids (from part 1) into the same graduated cylinder (to the left). The liquids are immiscible and will separate into distinct layers by density. Correctly drag and drop the liquids and put them in the correct order in the graduated cylinder. Put the colored rectangles (liquids) into the correct empty rectangles in the graduated cylinder (numbered rectangles). Densest liquid will be on the bottom. The least dense liquid will be on the top. 6 5 4 3 2 1 Harrisonite Wheelernone Waltonium Osborneum SAMSUNG Kellese Popebrillium
1. What volume of toluene do you need to add to 1 mL of ethyl acetate to make an equi-molar mixture? The density of ethyl acetate (C.HO2) is 0.898 g/mL and the density of toluene (C,Hs) is 0.867 g/mLu 2. List the folloving con