i) What two criteria should you ensure about your melting point sample before you fill the melting point capillary? j) After filling the capillary, what do you do to avoid air pockets? k) You accidentally overshoot the melting point of Z and the sample melts before you get a reading. Why should you not just wait for it to cool down and redo the determination with the same sample?

i) What two criteria should you ensure about your melting point sample before you fill the melting point capillary? j) After filling the capillary, what do you do to avoid air pockets? k) You accidentally overshoot the melting point of Z and the sample melts before you get a reading. Why should you not just wait for it to cool down and redo the determination with the same sample?

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter9: Liquids And Solids

Section: Chapter Questions

Problem 18QAP: Consider the phase diagram of the compound in Problem 17 to answer the following questions. (a) What...

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Chemistry 5. You melt the substance and de-coloration occurs. Unfortunately, you weren’t paying attention and miss the melting point. Should you start over or re-melt it? Or both are options ‘okay’? 6. When measuring the melting point of a substance, it suddenly disappears. What has happened? Can you still measure the melting point? If so, how? 7. We should not re-use a sample in a capillary tube for melting point measurement. Why not? 8. It takes significant amount of time for the melting point apparatus to cool down before next measurement if your new sample has a lower melting point than your previous one. What can you do to reduce this time in between measurements when many samples of different melting points are used?
1. What phase change would occur iat a constant pressure of 0.25 atm the temperature was increased from 0C to 50C? 2.Trace the portion of the line representing melting/freezing with blue ink. Trace boiling/condensation with black ink and the portion representing sublimation in red ink? 3. At what point do all phases exist in equilibrium?
11. Melting point temperatures are frequently used to help identify unknown solids and determine their purity. How would the melting point of a pure solid sample compare to that of the same solid contaminated by a solid impurity? Explain.
X Incorrect; Try Again; 5 attempts remaining You filled in 7 of 8 blanks incorrectly. Reconsider the name for point A. You may want to review Hint 2. Define the specific characteristics of the phase diagram. Part B The phase diagram for an organic compound is shown. 1.00 - Pressure (atm) 0.50 0.10 -200 -100 100 200 Temperature (°C) What is the normal boiling point of this compound? Express your answer as an integer and include the appropriate units. > View Available Hint(s) HẢ normal boiling point = Value. Units P Pearson Ch. 2 - Chemistr..pdf Ch. 2 Note Outlin..pdf MacBook Air DII DD D00 F8 F9 F7 E5 F6 F3 F4 & #3 2$ 6 8 3
Fully describe the steps for filling a capillary tube with a powdery solid.
Q3) what is the effect of impurities on melting point?
Water rises in a glass capillary tube to a height of 17 cm. What is the diameter of the capillary tube?
Consider the phase diagram of the compound in Problem 17 to answer the following questions. (a) What is the physical state of the compound at 35 mm Hg and 120C? (b) What is the normal freezing point of the compound? (c) What is the point A called? (d) What is the point B called? (e) What is the point C called? (f) What change occurs when at a constant pressure of 33 mm Hg, the temperature is decreased from 40C to -20C? (g) Will the solid float on the liquid? (h) Can the compound exist as a liquid at 180C and 2 atm pressure?
4. When performing a melting point on a solid compound using a melting point apparatus, two melting point determinations were made. One sample, which was 1 mm in height in the capillary, possessed a melting point of 200.0-200.5°C. The other sample was 25 mm in height. What would you expect the approximate melting point to be for this sample, assuming identical heating rates of 1°/min? (Hint: heat is applied from the bottom of the sample) (Give an actual numerical approximation!) 5. For the same solid compound as the question above, if the 1 mm sample was heated at 60° per minute on a melting point apparatus, what would you expect for an approximate melting point? (note that at this heating rate, the sample will melt rather quickly, but again give an actual numerical approximation)
Aside from the features, you can also determine the normal melting and boiling points in the phase diagram. The normal melting and boiling points are those when the pressure is 1 atmosphere. Using a ruler and a pen, locate the normal melting and boiling point.