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Question 14 The melting point of a pure compound is known to be 110-111°. Describe the...
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...
Organic chemistry d 1.43 grams of caffeine from 10 tea bags. If each tea bag weighs...
Organic chemistry
d 1.43 grams of caffeine from 10 tea bags. If each tea bag weighs 3.3 grams, what is the percent yield caffeine in the tea. 7. If the density of a certain liquid material is 1.27 gyml, caleulate the volume of the material that would be equivalent to 10 grams of the materials. The melting point of a pure compound is known to be 110-111°. Describe the melting behavior expected if this compound is contaminated with a 10...
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...
True/False When determining a melting point, it is desirable to use as much material as possible,...
True/False When determining a melting point, it is desirable to use as much material as possible, thus ensuring that you can observe a true equilibrium between solid and liquid phases. True/False Although a preliminary melting point can be done quickly to get an estimate of the approximate melting range, a sharp and accurate melting point value requires heating no faster than 1o – 2o per minute. True/False If you wish to repeat a melting point experiment, it is desirable to...
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...
30pts total) 1. Irwo known substances have the same melting point as an unknown substance that...
30pts total) 1. Irwo known substances have the same melting point as an unknown substance that you obtained, how could you determine if either of the two known substances is your unknown compound? 2. You are given an impure mix of substances that contains a solid substance, Chemical X, that is soluble in ethanol at all temperatures. You know there is an insoluble impurity in the mix as well as a very soluble impurity, both in ethanol. Can you recrystallize...
Boys 111 107 100 The data to the left are IQ test scores for 47 seventh...
Boys 111 107 100 The data to the left are IQ test scores for 47 seventh grade boys and 31 seventh grade girls from a Midwestern school district. 107 115 111 104 106 Do a test of hypothesis to see whether the mean test scores of the two groups are the same or different. Assume that the data represent a random sample from the population of 7th grade boys and girls from this school district. 113 109 113 128 128...
Powder (shor sten FUNNELS Fitering (long stem 63 Chapter 4 Melting Points, Boiling Points, and Refractive Indices Q...
Powder (shor sten FUNNELS Fitering (long stem 63 Chapter 4 Melting Points, Boiling Points, and Refractive Indices Questions 1. What effect would poor circulation of the melting point bath liquid have on the observed melting point? 2. What is the effect of an insoluble impurity, such as sodium sulfate, on the observed melting point of a compound? 3. Three test tubes, labeled A, B, and C, contain substances with approxi- mately the same melting points. How could you prove the...
Question 17 1 pts What solubility properties are important in the selection of a solvent for...
Question 17 1 pts What solubility properties are important in the selection of a solvent for recrystallisation? sparingly soluble in hot solvent and readily soluble in cold solvent readily soluble in both hot and cold solvent sparingly soluble in both hot and cold solvent readily soluble in hot solvent and sparingly soluble in cold solvent Question 18 1 pts How would you modify the procedure given in the Laboratory Manual if you did not know which solvent to use? if...
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...
Organic chemistry
d 1.43 grams of caffeine from 10 tea bags. If each tea bag weighs 3.3 grams, what is the percent yield caffeine in the tea. 7. If the density of a certain liquid material is 1.27 gyml, caleulate the volume of the material that would be equivalent to 10 grams of the materials. The melting point of a pure compound is known to be 110-111°. Describe the melting behavior expected if this compound is contaminated with a 10...
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...
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...
30pts total) 1. Irwo known substances have the same melting point as an unknown substance that you obtained, how could you determine if either of the two known substances is your unknown compound? 2. You are given an impure mix of substances that contains a solid substance, Chemical X, that is soluble in ethanol at all temperatures. You know there is an insoluble impurity in the mix as well as a very soluble impurity, both in ethanol. Can you recrystallize...
Boys 111 107 100 The data to the left are IQ test scores for 47 seventh grade boys and 31 seventh grade girls from a Midwestern school district. 107 115 111 104 106 Do a test of hypothesis to see whether the mean test scores of the two groups are the same or different. Assume that the data represent a random sample from the population of 7th grade boys and girls from this school district. 113 109 113 128 128...
Powder (shor sten FUNNELS Fitering (long stem 63 Chapter 4 Melting Points, Boiling Points, and Refractive Indices Questions 1. What effect would poor circulation of the melting point bath liquid have on the observed melting point? 2. What is the effect of an insoluble impurity, such as sodium sulfate, on the observed melting point of a compound? 3. Three test tubes, labeled A, B, and C, contain substances with approxi- mately the same melting points. How could you prove the...
Question 17 1 pts What solubility properties are important in the selection of a solvent for recrystallisation? sparingly soluble in hot solvent and readily soluble in cold solvent readily soluble in both hot and cold solvent sparingly soluble in both hot and cold solvent readily soluble in hot solvent and sparingly soluble in cold solvent Question 18 1 pts How would you modify the procedure given in the Laboratory Manual if you did not know which solvent to use? if...
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