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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
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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2 3 QUESTION 7 W 4 5 21 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. Click Save and Submit to save and submit. Click Save All Answers to save all answers. E 7 D 80 F3 8 $ 4 888 F4 R LL F 10 % S x / c I v X C V 5 T G #tv MacBook Air 6 Fo Y B & Ve 7 H A ad F7 5 * N 00 8 DII FB J 1 ( 9 F9 M ) O F10
Transcribed Image Text:2 3 QUESTION 7 W 4 5 21 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. Click Save and Submit to save and submit. Click Save All Answers to save all answers. E 7 D 80 F3 8 $ 4 888 F4 R LL F 10 % S x / c I v X C V 5 T G #tv MacBook Air 6 Fo Y B & Ve 7 H A ad F7 5 * N 00 8 DII FB J 1 ( 9 F9 M ) O F10
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