assuming there were no significant experimental errors, do you think the percent recovery of a recrystallization...
assuming there were no significant experimental errors, do you think the percent recovery of a recrystallization is the same as the percent of the impure sample that is the desired compound? for example, if you recovered 90% of the sample, does that mean 10% of the sample was the impurity? why or why not?
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assuming there were no significant experimental errors, do you
think the percent recovery of a recrystallization...
please answer all 5. Suppose you started with 10 g of impure compound A which was...
please answer all
5. Suppose you started with 10 g of impure compound A which was 80% pure, and after recrystallization you recovered 5 g of pure A. Calculate percent recovery. (5 points) 6. Should recrystallization increase or decrease the melting point range of the product you purified in class? Why? (5 points)
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...
in advance thank you! Post-Lab Worksheet 1. Do you think a dry sample of solid rubidium...
in advance thank you!
Post-Lab Worksheet 1. Do you think a dry sample of solid rubidium fluoride would conduct electricity? Why or why not? A scientist tested an unknown solid compound, and made the following observations: • • A sample of the unknown compound dissolved in water. The solution of the unknown compound in water conducted electricity A separate sample of the unknown compound dissolved in hexane. A dry sample of the unknown compound had a melting point of 750°C....
Why do you think you think meat consumption has a higher ecological impact than plant consumption?...
Why do you think you think meat consumption has a higher ecological impact than plant consumption? How does food packaging and the location of where food comes from having an ecological impact? What type of housing do you think would have a lower ecological impact, a single-family home development on large lots or a condominium building of the same square footage of living space? Describe your reasoning. (no wrong answer, just add your reasoning) If you were in charge of...
1. Why do you think it is so important that people label each other with regards...
1. Why do you think it is so important that people label each other with regards to race and ethnicity? 2. Think about your childhood, describe expressions that were focused on a certain gender. For example, "Act like a lady" How do you think this influences boys and girls. 3. How do you think that gender influences your career path? Are there certain careers that you feel should ONLY be for a certain group? Why or why not? 4. How...
Why do you think diffrent volumes of acetic anhydride were used in the diffent ester sysnthesis...
Why do you think diffrent volumes of acetic anhydride were used in the diffent ester sysnthesis even though the same volume of alcohol was used for each?
i) If you were going to buy an engine to drive a pump which requires 3 HP at 3000 RPM, do you think it would be more efficient to use an engine which produces 3 HP at 100 percent throttle or a larger...
i) If you were going to buy an engine to drive a pump which requires 3 HP at 3000 RPM, do you think it would be more efficient to use an engine which produces 3 HP at 100 percent throttle or a larger engine which produces 3 HP at 40 percent throttle? Why?
i) If you were going to buy an engine to drive a pump which requires 3 HP at 3000 RPM, do you think it would be more...
Problem #8. The strain energy of a cyclic hydrocarbon can be estimated using the experimental enthalpy...
Problem #8. The strain energy of a cyclic hydrocarbon can be estimated using the experimental enthalpy of formation of that compound and the calculated enthalpy of formation for a hypothetical strain-free ring. This would be a ring containing an infinite number of methylene (CH2) groups. Calculated AH for AH per CH2 strain-free (kcal/mol) molecule (kcal/mol) Strain Energy per CH2 (kcal/mol) + 4.2 - 14.7 Strain Energy (kcal/mol) 27.4 26.4 5.8 9.1 + 1.7 - 19.6 - 3.7 - 24.5 Measured...
1. Why do you think that the ilities are considered a part of systems engineering rather...
1. Why do you think that the ilities are considered a part of systems engineering rather than design? 2. Contrast the “traditional” ilities of reliability and maintainability with those of human factors and environmental engineering. In what ways are they similar? In what ways are they different? 3. Do the same disciplines apply to software and hardware? For example, does software “break” in the way that hardware does? Does it break without warning and unpredictably at all?
Can you be healthy at any size? Do you think people can be overweight and healthy...
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please answer all
5. Suppose you started with 10 g of impure compound A which was 80% pure, and after recrystallization you recovered 5 g of pure A. Calculate percent recovery. (5 points) 6. Should recrystallization increase or decrease the melting point range of the product you purified in class? Why? (5 points)
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...
in advance thank you!
Post-Lab Worksheet 1. Do you think a dry sample of solid rubidium fluoride would conduct electricity? Why or why not? A scientist tested an unknown solid compound, and made the following observations: • • A sample of the unknown compound dissolved in water. The solution of the unknown compound in water conducted electricity A separate sample of the unknown compound dissolved in hexane. A dry sample of the unknown compound had a melting point of 750°C....
1. Why do you think it is so important that people label each other with regards to race and ethnicity? 2. Think about your childhood, describe expressions that were focused on a certain gender. For example, "Act like a lady" How do you think this influences boys and girls. 3. How do you think that gender influences your career path? Are there certain careers that you feel should ONLY be for a certain group? Why or why not? 4. How...
i) If you were going to buy an engine to drive a pump which requires 3 HP at 3000 RPM, do you think it would be more efficient to use an engine which produces 3 HP at 100 percent throttle or a larger engine which produces 3 HP at 40 percent throttle? Why?
i) If you were going to buy an engine to drive a pump which requires 3 HP at 3000 RPM, do you think it would be more...
Problem #8. The strain energy of a cyclic hydrocarbon can be estimated using the experimental enthalpy of formation of that compound and the calculated enthalpy of formation for a hypothetical strain-free ring. This would be a ring containing an infinite number of methylene (CH2) groups. Calculated AH for AH per CH2 strain-free (kcal/mol) molecule (kcal/mol) Strain Energy per CH2 (kcal/mol) + 4.2 - 14.7 Strain Energy (kcal/mol) 27.4 26.4 5.8 9.1 + 1.7 - 19.6 - 3.7 - 24.5 Measured...
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