QUESTION 7 How can a sample be loaded into the melting point capillary tube? O Push the open end of the tube into the sample. Tap the tube against the lab countertop, closed-end-down. O Push the closed end of the tube into the sample. Tap the tube against the lab countertop, open-end-down. O Push the closed end of the tube into the sample. Tap the tube against the lab countertop, closed-end-down. O Push the open end of the tube into the sample. Tap the tube against the lab countertop, open-end-down. QUESTION 8 A student working next to you complains that their recrystallized sample has a broad melting range, usually about 50-59 °C. This is not close to the melting point of any possible unknowns they may have been assigned. What advice can you offer this student? O Use the higher end of this range, 59 °C, to estimate the melting point and try to identify your unknown based on that. O Use the lower end of this range, 50 °C, to estimate the melting point and try to identify your unknown based on that. O Your crystals may not be dried yet. Leave the crystals to dry for at least a day before checking the melting point again. O You are using too low of a heat ramp. Try a heat ramp of 2.0 or 5.0 to give the sample enough heat to melt properly. QUESTION 9 Unknown #5 and stearic acid both have a melting range of 69-71 °C. How can you describe unknown # 5? O Unknown #5 might be pure stearic acid. It could also be another compound with the same melting range as stearic acid. Unkonwn #5 can not possibly be stearic acid. O Unknown #5 is impure stearic acid. O Unkonwn #5 must be pure stearic acid and could not be anything else.
QUESTION 7 How can a sample be loaded into the melting point capillary tube? O Push the open end of the tube into the sample. Tap the tube against the lab countertop, closed-end-down. O Push the closed end of the tube into the sample. Tap the tube against the lab countertop, open-end-down. O Push the closed end of the tube into the sample. Tap the tube against the lab countertop, closed-end-down. O Push the open end of the tube into the sample. Tap the tube against the lab countertop, open-end-down. QUESTION 8 A student working next to you complains that their recrystallized sample has a broad melting range, usually about 50-59 °C. This is not close to the melting point of any possible unknowns they may have been assigned. What advice can you offer this student? O Use the higher end of this range, 59 °C, to estimate the melting point and try to identify your unknown based on that. O Use the lower end of this range, 50 °C, to estimate the melting point and try to identify your unknown based on that. O Your crystals may not be dried yet. Leave the crystals to dry for at least a day before checking the melting point again. O You are using too low of a heat ramp. Try a heat ramp of 2.0 or 5.0 to give the sample enough heat to melt properly. QUESTION 9 Unknown #5 and stearic acid both have a melting range of 69-71 °C. How can you describe unknown # 5? O Unknown #5 might be pure stearic acid. It could also be another compound with the same melting range as stearic acid. Unkonwn #5 can not possibly be stearic acid. O Unknown #5 is impure stearic acid. O Unkonwn #5 must be pure stearic acid and could not be anything else.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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QUESTION 7
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How can a sample be loaded into the melting point capillary tube?
O Push the open end of the tube into the sample. Tap the tube against the lab countertop, closed-end-down.
O Push the closed end of the tube into the sample. Tap the tube against the lab countertop, open-end-down.
O Push the closed end of the tube into the sample. Tap the tube against the lab countertop, closed-end-down.
O Push the open end of the tube into the sample. Tap the tube against the lab countertop, open-end-down.
QUESTION 8
A student working next to you complains that their recrystallized sample has a broad melting range, usually about 50-59 °C. This is not close to the melting point of any possible
unknowns they may have been assigned. What advice can you offer this student?
O Use the higher end of this range, 59 °C, to estimate the melting point and try to identify your unknown based on that.
O Use the lower end of this range, 50 °C, to estimate the melting point and try to identify your unknown based on that.
O Your crystals may not be dried yet. Leave the crystals to dry for at least a day before checking the melting point again.
O You are using too low of a heat ramp. Try a heat ramp of 2.0 or 5.0 to give the sample enough heat to melt properly.
*3
6
QUESTION 9
Unknown #5 and stearic acid both have a melting range of 69-71 °C. How can you describe unknown #5?
O Unknown #5 might be pure stearic acid. It could also be another compound with the same melting range as stearic acid.
O Unkonwn # 5 can not possibly be stearic acid.
O Unknown #5 is impure stearic acid.
O Unkonwn # 5 must be pure stearic acid and could not be anything else.
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