Homework Answers
soluion:
correct option D) B
To determine the melting point of a compound the capillary tube is filled with sample for about 3mm. From the given figures capillary B has correct filling of sample
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Which of the melting point capillaries in the picture below is filled to the proper level...
Question 1 5 pts - What is the purpose of melting point? All the answers To...
Question 1 5 pts - What is the purpose of melting point? All the answers To check the purity of solids To check identity of unkown solids To publish for new solids for future characterization Question 2 5 pts How does impurity change melting point value and range? increase-narrowing decrease-narrowing decrease-broadening O increase-broadening Question 3 5 pts What is the reason of an impurity affecting melting point of a solid? Watch Mel. Point Theory video. Not known Obc it weakens...
Question 1 5 pts - What is the purpose of melting point? All the answers To...
Question 1 5 pts - What is the purpose of melting point? All the answers To check the purity of solids To check identity of unkown solids To publish for new solids for future characterization Question 2 5 pts How does impurity change melting point value and range? increase-narrowing decrease-narrowing decrease-broadening O increase-broadening Question 3 5 pts What is the reason of an impurity affecting melting point of a solid? Watch Mel. Point Theory video. Not known Obc it weakens...
Which of the following is NOT a factor that influences the melting point range of a...
Which of the following is NOT a factor that influences the melting point range of a solid? The size of the crystals The rate of heating Density of packing the sample Melting point apparatus
Answer the following True or False When heating substances: 1.All melting point capillaries with melting point...
Answer the following True or False When heating substances: 1.All melting point capillaries with melting point samples must be disposed of in the proper containers. 2.Give heated glass adequate time to cool; it looks cool long before it is safe to handle. 3.Avoid heating any object too suddenly. Apply the flame intermittently at first. 4.Never apply the direct heat of a flame to heavy glassware such as volumetric flasks, burets, graduate cylinders, bottles, mortars, pestles, and thermometers 5.If a mercury...
Recrystallization: Percent error of melting point and how impurities affect melting point: Please explain both questions...
Recrystallization: Percent error of melting point and
how impurities affect melting point:
Please explain both questions below:
(Part A) During a recrystallization experiment, the literature melting point of a compound is 105-107 °C. The melting point temperature you obtain from your recrystallized compound is 103-105 °C. Which of the following would be the proper way to set up the percent error of your mp? (a) (104/106)*100 (b) [(106-104)/106] *100 (c) (107/105)*100 (d) [(107-105)/107] *100 (Part B) For a recrystallization experiment...
O by proper solvent. T u decreases as the pressure of the system increases, Melting point...
O by proper solvent. T u decreases as the pressure of the system increases, Melting point test, if the sample is containing some solvent, the melting point will be higher than it should be. d) The catalyst is the substance that can speed up the reaction without consumption during F D) the reaction process e) The purpose of Na2SO4 is to remove water from the aqueous layer. If any solvent turns the pH paper into blue, the solvent is alkaline....
Question 14 The melting point of a pure compound is known to be 110-111º. Describe the...
Question 14 The melting point of a pure compound is known to be 110-111º. Describe the melting behavior expected if this compound is contaminated with 5% of an impurity. 90-96 111-113 90-91 110-111 5 pts Question 15 You and your lab partner take melting points of the same sample. You observe a melting point of 101-107°C, while your partner observes a value of 110-112°C. Explain how you can get two different values with exactly the same sample. One of the...
which one of these has the highest melting point? Which of these has the highest melting...
which one of these has the highest melting point?
Which of these has the highest melting point? Select one: o a. sodium O b. bromine C. iron O d. diamond
- A student is trying to identify an unknown solid based on its melting point. She...
- A student is trying to identify an unknown solid based on its melting point. She noted that the compound began to melt at 182°C and finished melting at 187°C. Knowing it is possible for there to be impurities in the sample, is this compound more likely to be camphor or hydroquinone. Explain your reasoning. A young chemist has synthesized what he believed to be acetaminophen. He measured the melting point of this newly formed compound to be 163-178°C. If...
Decide which element probably has a melting point most and least similar to the melting point...
Decide which element probably has a melting point most and least similar to the melting point of sodium. Comparing melting point: potassium indium thallium oxygen most similar to sodium least similar to sodium x 5 ?
Question 1 5 pts - What is the purpose of melting point? All the answers To check the purity of solids To check identity of unkown solids To publish for new solids for future characterization Question 2 5 pts How does impurity change melting point value and range? increase-narrowing decrease-narrowing decrease-broadening O increase-broadening Question 3 5 pts What is the reason of an impurity affecting melting point of a solid? Watch Mel. Point Theory video. Not known Obc it weakens...
Question 1 5 pts - What is the purpose of melting point? All the answers To check the purity of solids To check identity of unkown solids To publish for new solids for future characterization Question 2 5 pts How does impurity change melting point value and range? increase-narrowing decrease-narrowing decrease-broadening O increase-broadening Question 3 5 pts What is the reason of an impurity affecting melting point of a solid? Watch Mel. Point Theory video. Not known Obc it weakens...
Which of the following is NOT a factor that influences the melting point range of a solid? The size of the crystals The rate of heating Density of packing the sample Melting point apparatus
Recrystallization: Percent error of melting point and
how impurities affect melting point:
Please explain both questions below:
(Part A) During a recrystallization experiment, the literature melting point of a compound is 105-107 °C. The melting point temperature you obtain from your recrystallized compound is 103-105 °C. Which of the following would be the proper way to set up the percent error of your mp? (a) (104/106)*100 (b) [(106-104)/106] *100 (c) (107/105)*100 (d) [(107-105)/107] *100 (Part B) For a recrystallization experiment...
O by proper solvent. T u decreases as the pressure of the system increases, Melting point test, if the sample is containing some solvent, the melting point will be higher than it should be. d) The catalyst is the substance that can speed up the reaction without consumption during F D) the reaction process e) The purpose of Na2SO4 is to remove water from the aqueous layer. If any solvent turns the pH paper into blue, the solvent is alkaline....
Question 14 The melting point of a pure compound is known to be 110-111º. Describe the melting behavior expected if this compound is contaminated with 5% of an impurity. 90-96 111-113 90-91 110-111 5 pts Question 15 You and your lab partner take melting points of the same sample. You observe a melting point of 101-107°C, while your partner observes a value of 110-112°C. Explain how you can get two different values with exactly the same sample. One of the...
which one of these has the highest melting point?
Which of these has the highest melting point? Select one: o a. sodium O b. bromine C. iron O d. diamond
- A student is trying to identify an unknown solid based on its melting point. She noted that the compound began to melt at 182°C and finished melting at 187°C. Knowing it is possible for there to be impurities in the sample, is this compound more likely to be camphor or hydroquinone. Explain your reasoning. A young chemist has synthesized what he believed to be acetaminophen. He measured the melting point of this newly formed compound to be 163-178°C. If...
Decide which element probably has a melting point most and least similar to the melting point of sodium. Comparing melting point: potassium indium thallium oxygen most similar to sodium least similar to sodium x 5 ?
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