Use the following data to answer 2 through 5: Temperature solid starts melting 69.5 C Temperature...
Use the following data to answer 2 through 5:
Temperature solid starts melting 69.5 C
Temperature solid ends melting 70.0 C
2. The melting point of the unknown solid is ________.
3.The identity of the unknown solid is ________.
4.The range for the previous solid is ________.
5. Based on the range, we can conclude the sample is ________.
Homework Answers
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Use the following data to answer 2 through 5:
Temperature solid starts melting 69.5 C
Temperature...
3. The melting point of unknown A was measured to be 110-120°C and unknown B was...
3. The melting point of unknown A was measured to be 110-120°C and unknown B was measured to be 105-109°C. What statement would make the best conclusion about the identity and purity of the product? (4 pts) A. Unknown A range of 110-120°C is the pure substance. Unknown B range of 105-109°C contains impurities. B. Unknown B range of 105-109°C is the pure substance. Unknown A range of 110-120°C contains impurities. C. Both Unknown A and B are pure substances....
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.
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...
Use the phase diagram of Substance X below to find the melting point of X when the pressure above the solid is 0.43...
Use the phase diagram of Substance X below to find the melting point of X when the pressure above the solid is 0.43 atm. solid pressure (atm) liquid gas temperature (K) Note: your answer must be within 12.5 °C of the exact answer to be graded correct. X 5 ?
Use the data to sketch the phase diagram for xenon (Xe) and then answer the questions...
Use the data to sketch the phase diagram for xenon (Xe) and then answer the questions that follow. Normal boiling point: 165 K Normal melting point: 161 K Triple point: 152 K, .37 atm Critical temperature: 290 K Critical pressure: 57 atm A. What phase is xenon at atmospheric conditions? B. Is liquid xenon more or less dense than solid xenon? Use the diagram to justify your answer. C. What is the appropriate maximum pressure of gas that can exist...
4. Use this melting-point-composition diagram for two substances, A and B, to answer the following questions...
4. Use this melting-point-composition diagram for two substances, A and B, to answer the following questions : 120 100 + O nas 80 + + + mol % A mol 8 B + 100 0 + + + 80 - 60 40 200 20 40 60 80 100 Composition (mol ) A. What are the melting point and composition of the eutectic ? B. What is the theoretical melting temperature range for a mixture of 90 mol % A and...
1-What solvent you use to determine the density of zinc chloride? 2-The density of a solid...
1-What solvent you use to determine the density of zinc chloride? 2-The density of a solid with a melting point of 42 to 44 C was determined to be 0.87+- 0.02 g\mL. what is the solid? 3-The density of a liquid whose boiling point is 55 to 57 C was determined to be 0.77+- 0.05 g\mL. what is the liquid? 4-Is diphenylmethane a solid or a liquid at room temperature? 5-What solvent would you use to measure the density of...
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....
3. The melting point of unknown A was measured to be 110-120°C and unknown B was measured to be 105-109°C. What statement would make the best conclusion about the identity and purity of the product? (4 pts) A. Unknown A range of 110-120°C is the pure substance. Unknown B range of 105-109°C contains impurities. B. Unknown B range of 105-109°C is the pure substance. Unknown A range of 110-120°C contains impurities. C. Both Unknown A and B are pure substances....
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.
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...
Use the phase diagram of Substance X below to find the melting point of X when the pressure above the solid is 0.43 atm. solid pressure (atm) liquid gas temperature (K) Note: your answer must be within 12.5 °C of the exact answer to be graded correct. X 5 ?
4. Use this melting-point-composition diagram for two substances, A and B, to answer the following questions : 120 100 + O nas 80 + + + mol % A mol 8 B + 100 0 + + + 80 - 60 40 200 20 40 60 80 100 Composition (mol ) A. What are the melting point and composition of the eutectic ? B. What is the theoretical melting temperature range for a mixture of 90 mol % A and...
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....
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