A student thinks they may have one of two possible compounds. Compound A, has a melting...
A student thinks they may have one of two possible compounds.
Compound A, has a melting point of 160°C, compound B has a melting
point of 161°C. The student’s unknown melts
at 160.5. The student test the unknown again and gets 160.4…160.6.
How can students use compound A or B to determine the identity of
the unknown?
Homework Answers
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A student thinks they may have one of two possible compounds.
Compound A, has a melting...
please answer them 7 and 8 7. A student was given an unknown compound X, which...
please answer them 7 and 8
7. A student was given an unknown compound X, which is one of the four compounds listed below. Substance Literature Melting Point (°C) o-toluic acid 102 122 m-aminophenol benzoic acid Phenyl succinate 122 121 . A mixture of X with benzoic acid melts at 92°C, a mixture of X with phenyl succinate melts at 120°C and a mixture of X with m-amino phenol melts at 102°C. The student wrote that the unknown compound is...
- 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...
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...
A unknow compound was found to have an experiment melting point , MPexp, of 126.0-130.2 degree...
A unknow compound was found to have an experiment melting point , MPexp, of 126.0-130.2 degree Celsius.Assume the thermometer in the experiment was pre -calibrated to read accurate temperature.(a) .Comment on the purity of the unknow. Briefly explain. (b) . Achemist is given a list of possible identities for the solid unknown. which is the likely identity? Explain your decision. Compound melting point. A 87.5-88.5 degree Celsius B 125.5-127.0 degree Celsius C 132.5-134.5 degree celsius
17. A pure compound melts at 48-49 degrees Celsius. If a trace amount of an impure...
17. A pure compound melts at 48-49 degrees Celsius. If a trace amount of an impure compound, whose melting point is 80-82 degrees Celsius, is mixed in with the first compound, what happens to the melting point of the pure compound? A. The second compound would lower the melting point of the first one B. It is impossible to determine without knowing the identity of the two compounds. C. The second compound would raise the melting point of the first...
what could be the possible structure of this nmr? The unknown compounds has melting point range...
what could be the possible
structure of this nmr? The unknown compounds has melting point
range of 93-96 degree Celsius
#4. Aqueous layer 59-4-1 1 1 /opt/topepin3.6.1/data/jing/rime [rel] NOCOWO 8.1610 8.1481 في نطا 30 1.0000 0.4966 1.0024 Ippm]
Question text You may have noticed that % composition vs Melting Point graphs are given in...
Question text You may have noticed that % composition vs Melting Point graphs are given in % Mole not % Weight. This is because melting point depression is a colligative property (review in your general chemistry text) that depends on the moles of impurity, the same number of moles of impurity of two different compounds will cause the same melting point depression! Before the advent of mass spectrometry this was one of the techniques used to determine the molecular weight...
You may have noticed that % composition vs Melting Point graphs are given in % Mole...
You may have noticed that % composition vs Melting Point graphs are given in % Mole not 96 Weight. This is because melting point depression is a colligative property (review in your general chemistry text) that depends on the moles of impurity, the same number of moles of impurity of two different compounds will cause the same melting point depression! Before the advent of mass spectrometry this was one of the techniques used to determine the molecular weight of compounds....
A student performs two melting-point determinations on a crystalline product. In one determination, the capillary tube...
A student performs two melting-point determinations on a crystalline product. In one determination, the capillary tube contains a sample about 1−2 mm in height and the melting range is found to be 141−142°C. In the other determination, the sample height is 4−5 mm and the melting range is found to be 141−145°C. Explain the broader melting-point range observed for the second sample. The reported melting point for the compound is 143°C. Explain what may have caused the broader melting range...
Please right an in depth discussion about part C. We we’re not able to get any...
Please right an
in depth discussion about part C. We we’re not able to get any
recrystallization from our unknown. Talk about possible failures
that could of happen that prevented us to not get any or our
unknown to recrystallize. Thanks so much!
Experiment 1: Solids: Recrystallization and Melting Point Learning Outcomes: Upon completion of this lab, students will be able to perform the technique of recrystallization of an impure solid as well as be able to determine an appropriate...
please answer them 7 and 8
7. A student was given an unknown compound X, which is one of the four compounds listed below. Substance Literature Melting Point (°C) o-toluic acid 102 122 m-aminophenol benzoic acid Phenyl succinate 122 121 . A mixture of X with benzoic acid melts at 92°C, a mixture of X with phenyl succinate melts at 120°C and a mixture of X with m-amino phenol melts at 102°C. The student wrote that the unknown compound is...
- 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...
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...
what could be the possible
structure of this nmr? The unknown compounds has melting point
range of 93-96 degree Celsius
#4. Aqueous layer 59-4-1 1 1 /opt/topepin3.6.1/data/jing/rime [rel] NOCOWO 8.1610 8.1481 في نطا 30 1.0000 0.4966 1.0024 Ippm]
You may have noticed that % composition vs Melting Point graphs are given in % Mole not 96 Weight. This is because melting point depression is a colligative property (review in your general chemistry text) that depends on the moles of impurity, the same number of moles of impurity of two different compounds will cause the same melting point depression! Before the advent of mass spectrometry this was one of the techniques used to determine the molecular weight of compounds....
Please right an
in depth discussion about part C. We we’re not able to get any
recrystallization from our unknown. Talk about possible failures
that could of happen that prevented us to not get any or our
unknown to recrystallize. Thanks so much!
Experiment 1: Solids: Recrystallization and Melting Point Learning Outcomes: Upon completion of this lab, students will be able to perform the technique of recrystallization of an impure solid as well as be able to determine an appropriate...
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