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?
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Compound X has just been successfully synthesized. Crystals of
the crude product had a melting point...
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...
Question 18 1 pts A compound of interest has a theoretical melting point (MP) of 162-163...
Question 18 1 pts A compound of interest has a theoretical melting point (MP) of 162-163 °C while its experimental MP was measured to be 157-161 °C. Which of the following statements reflects this observation? The compound of interest was not isolated as the MP range is not identical. The compound of interest was isolated but is slightly impure as the MP is slightly lower and has wider range. The compound of interest was not isolated as the MP had...
10. The melting point of known compound has been reported to be around 145 °C. One...
10. The melting point of known compound has been reported to be around 145 °C. One would expect the purest sample to be which of these values? a. 143-146°C b. 140-145 °C C. 142-143 °C d. 140-144 °C
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...
- 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...
please answer all parts I am trying to check my answers. Recrystallization of Acetanilide Recrystallization is...
please answer all parts I am trying to check my
answers.
Recrystallization of Acetanilide Recrystallization is an important method used by chemists to purify solid compounds. When a chemist conducts a chemical reaction as shown in Scheme 1, it will rarely go to 100% completion, and will frequently produce byproducts. These byproducts and some of the unreacted starting materials will be present in the end as impurities. Chemists need ways to remove these unwanted impurities so they can isolate their...
please help me answer those three questions according to the oother pictures į CH, CH3 1....
please help me answer those three questions according to the
oother pictures
į CH, CH3 1. NaOMe in MeOH / EtOH, reflux 2. Ethyl lodide, reflux N bolo OH Acetaminophen phenacetini erot!) DAN Procedure: Measure and dispense 0.6 ml of a 4.4 M solution of sodium methoxide in methanol and im of ethanol into a 5 mL reaction vial. Add 215 mmol of acetaminophen (-0.378 8). Set up for reflux in the Tume hood and bring reaction to reflux for...
Historically, Ericson had been the low-cost producer of vanilla and chocolate ice crema and enjoy...
Historically, Ericson had been the low-cost producer of vanilla
and chocolate ice crema and enjoyed profit margins in excess of 20%
of sales. Several years ago, Dennis Selmor, the sales manager, had
seen opportunities to expand the business by extending the product
line to new flavours that earned premium selling prices. Five years
earlier, Ericson had introduced strawberry ice cream, which
required the same basic production technology but could be sold at
prices that were 3% higher than vanilla and...
What are the desirable characteristics of a solvent to be used in the recrystallisation of a...
What are the desirable characteristics of a solvent to be used
in the recrystallisation of a solid product? (Hint: what is the
underlying purpose of doing recrystallisation, aside from making
the product look attractive?)
EXPERIMENT5 PREPARATION OF BENZOIC ACID Oxidation of a Primary Alcohol In this experiment, a primary alcohol (benzyl alcohol) is oxidised to a carboxylic acid (benzoic acid) by a strong oxidising agent (potassium permanganate) Because the synthesis reaction is carried out in basic conditions, the carboxylic acid...
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 18 1 pts A compound of interest has a theoretical melting point (MP) of 162-163 °C while its experimental MP was measured to be 157-161 °C. Which of the following statements reflects this observation? The compound of interest was not isolated as the MP range is not identical. The compound of interest was isolated but is slightly impure as the MP is slightly lower and has wider range. The compound of interest was not isolated as the MP had...
10. The melting point of known compound has been reported to be around 145 °C. One would expect the purest sample to be which of these values? a. 143-146°C b. 140-145 °C C. 142-143 °C d. 140-144 °C
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...
- 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...
please answer all parts I am trying to check my
answers.
Recrystallization of Acetanilide Recrystallization is an important method used by chemists to purify solid compounds. When a chemist conducts a chemical reaction as shown in Scheme 1, it will rarely go to 100% completion, and will frequently produce byproducts. These byproducts and some of the unreacted starting materials will be present in the end as impurities. Chemists need ways to remove these unwanted impurities so they can isolate their...
please help me answer those three questions according to the
oother pictures
į CH, CH3 1. NaOMe in MeOH / EtOH, reflux 2. Ethyl lodide, reflux N bolo OH Acetaminophen phenacetini erot!) DAN Procedure: Measure and dispense 0.6 ml of a 4.4 M solution of sodium methoxide in methanol and im of ethanol into a 5 mL reaction vial. Add 215 mmol of acetaminophen (-0.378 8). Set up for reflux in the Tume hood and bring reaction to reflux for...
Historically, Ericson had been the low-cost producer of vanilla
and chocolate ice crema and enjoyed profit margins in excess of 20%
of sales. Several years ago, Dennis Selmor, the sales manager, had
seen opportunities to expand the business by extending the product
line to new flavours that earned premium selling prices. Five years
earlier, Ericson had introduced strawberry ice cream, which
required the same basic production technology but could be sold at
prices that were 3% higher than vanilla and...
What are the desirable characteristics of a solvent to be used
in the recrystallisation of a solid product? (Hint: what is the
underlying purpose of doing recrystallisation, aside from making
the product look attractive?)
EXPERIMENT5 PREPARATION OF BENZOIC ACID Oxidation of a Primary Alcohol In this experiment, a primary alcohol (benzyl alcohol) is oxidised to a carboxylic acid (benzoic acid) by a strong oxidising agent (potassium permanganate) Because the synthesis reaction is carried out in basic conditions, the carboxylic acid...
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