Homework Answers
The answer is option (a) that is melting point of the purest sample is 143-146 degree Celsius. Because adding impurity decreases melting point and increases the melting point range. So considering this fact we can say that purest sample will have little higher melting point and thus we can safely choose the option (a).
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10. The melting point of known compound has been reported to be around 145 °C. One...
6. Which of the following compounds will have higher boiling point? a)CH CH2CH2OH b)CH,CH2CH2CH.CH c)HOCH CH2OH 7....
6. Which of the following compounds will have higher boiling point? a)CH CH2CH2OH b)CH,CH2CH2CH.CH c)HOCH CH2OH 7. What is the difference between alkane, alkene and alkyne? 8. Which of the following compound can participate in hydrogen bonding? i. 2-propanol Acetic acid ii. The side chain of serine iv. The side chain of phenylalanine a. i and il b. i only c. Iiland ly d. and iv 9. Rotation around each C-C bond is not possible for which compound? a. Propanol-2...
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...
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...
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 110-111°. 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...
When performing a melting point on a solid compound, 2 melting point determinations were made. One...
When performing a melting point on a solid compound, 2 melting point determinations were made. One sample, which was 1 mm in height in the capillary, possessed a melting point of 150-151°C. The other sample was 25 mm in height. What would you expect the approximate melting point to be for this 25 mm sample, if the heating rate for both samples was 2 degrees per minute? (Hint: use algebra to solve the mp range) 4.
Compound X has just been successfully synthesized. Crystals of the crude product had a melting point...
Compound X has just been successfully synthesized. Crystals of the crude product had a melting point range of 120 - 130 °C. After recrystalization, the new melting point range was 124.5 - 125.5 °C. Which sample was more pure, the crude product or recrystallized product? Why?
A solid unknown has a melting point range of around 115-117 deg C and has a...
A solid unknown has a melting point range of around 115-117 deg
C and has a IR spectrum shown below. What is the likely
structure/name of the compound?
compound with an IR peak around 1700 em gave a yellow pecipitate with iodoform test. The...
compound with an IR peak around 1700 em gave a yellow pecipitate with iodoform test. The compound was reacted with Tollen's reagent but no silver mirror formed. A probable structure for this compound is 8. Read the table below Boiling Point °C 182-185 Benzylamine 184 Compound Derivatives melting point (C) Benzamide 105 163 Picrate 199 198 Acetamide 60 144 Aniline For an unknown sample, if its boiling point is about 183-184 °C, which derivative test is not suitable to identify...
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...
6. Which of the following compounds will have higher boiling point? a)CH CH2CH2OH b)CH,CH2CH2CH.CH c)HOCH CH2OH 7. What is the difference between alkane, alkene and alkyne? 8. Which of the following compound can participate in hydrogen bonding? i. 2-propanol Acetic acid ii. The side chain of serine iv. The side chain of phenylalanine a. i and il b. i only c. Iiland ly d. and iv 9. Rotation around each C-C bond is not possible for which compound? a. Propanol-2...
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...
Question 14 The melting point of a pure compound is known to be 110-111°. 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...
When performing a melting point on a solid compound, 2 melting point determinations were made. One sample, which was 1 mm in height in the capillary, possessed a melting point of 150-151°C. The other sample was 25 mm in height. What would you expect the approximate melting point to be for this 25 mm sample, if the heating rate for both samples was 2 degrees per minute? (Hint: use algebra to solve the mp range) 4.
A solid unknown has a melting point range of around 115-117 deg
C and has a IR spectrum shown below. What is the likely
structure/name of the compound?
compound with an IR peak around 1700 em gave a yellow pecipitate with iodoform test. The compound was reacted with Tollen's reagent but no silver mirror formed. A probable structure for this compound is 8. Read the table below Boiling Point °C 182-185 Benzylamine 184 Compound Derivatives melting point (C) Benzamide 105 163 Picrate 199 198 Acetamide 60 144 Aniline For an unknown sample, if its boiling point is about 183-184 °C, which derivative test is not suitable to identify...
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...
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