Suppose you have too different and miscible substances, A and B, that happen to have the same melting point 120.0-121.0 °C. If you make a 1:3 mixture of A and B, briefly describe what would happen to the melting temperature and melting range.
Suppose you have too different and miscible substances, A and B, that happen to have the...
3. A mixture of two miscible liquids with widely different boiling points is distilled. The temperature of the vapor is observed to plateau and then drop before rising again. Explain this temperature drop. (3 points) 4. If you doubled the length of the fractional distillation column, what would be the advantages and disadvantages? (3 points) 5. Why is better separation of two liquids achieved by slower heating of a mixture? (3 points)
4. Use this melting-point-composition diagram for two substances, A and B, to answer the following questions : 120 100 + O nas 80 + + + mol % A mol 8 B + 100 0 + + + 80 - 60 40 200 20 40 60 80 100 Composition (mol ) A. What are the melting point and composition of the eutectic ? B. What is the theoretical melting temperature range for a mixture of 90 mol % A and...
Fraction Distillation 1. Draw and explain phase diagram of a mixture of two miscible components in a solution. 2. Describe the following terms in gas chromatography a. Carrier gas b. Column packing 3. What would happen to retention time? a. If we increase flow rate b. Decrease molecular weights of components
If you have equal masses of two different substances (A and B), and the density of A is twice the density of B, then the volume of A is ________ the volume of B. a. The same as b. One-half c. Two times d. One-quarter e. Four times
need help on 1,2,3,4 1. The starting material for aspirin is salicylic acid which is a phenol. • (2 pts) Which chemical test will you use to test for unreacted phenol when the aspirin synthesis is completed? (It's a chemical test you have used earlier in the semester) (2 pts) What does a positive test for phenol look like using this test? 2. When finding a melting point experimentally, it is always reported as a range T1-T2. 2a. (3 pts)...
Fraction Distillation Fraction Distillation 1. Draw and explain phase diagram of a mixture of two miscible components in a solution. 2. Describe the following terms in gas chromatography a. Carrier gas b. Column packing 3. What would happen to retention time? a. If we increase flow rate b. Decrease molecular weights of components
How would a mixture of naphthalene and benzophenone behave on a TLC plate with hexanes / acetone as the eluent? Compare the polarity of these two compounds. Outline the most commonly used procedure for the purification of an impure solid material using the technique of recrystallization. Why is acetone such a popular solvent? Point out one drawback in terms of safety considerations. Your final product might be impure since you suspect decomposition might have occurred. When determining the melting point...
Station 5 Compounds A, B, and C all have a melting point range of 94-96 °C. When mixed together, A and B melt at 82-95 °C. When mixed together, A and C melt at 95-97 °C a. Are compounds A and B identical (yes or no) b. Are compounds A and C identical (yes or no)? c. What would you expect the melting point range for a mixture of B and C to be? Station 5 Compounds A, B, and...
PART B MELTING POINTS OF SOME ORGANIC SUBSTANCES Circle the pair of substances of which you measured the melting point range 7 2-naphthol (A) and naphthalene (B) benzophenone (A) and benzil (B Complete the following table: [6 marks] Hint Molecules containing only Cand H can be assumed to be non-polar Present in Present in А Stronger in which substance? Why? Intermolecular Force В (yes or no) (yes or no) London Dispersion Dipole-Dipole Hydrogen Bonding Which of the two substances that...
W cepted. Please do not ask for special treatment. 1. The starting material for aspirin is salicylic acid which is a phenol • 2 pts) Which chemical test will you use to test for unrearted phenol when the aspirin sync (it's a chemical test you have used earlier in the semester) cted phenol when the aspirin synthesis is completed? • (2 pts) What does a positive test for phenol look like using this test? 2. When finding a melting point...