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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...
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 17 1 pts What solubility properties are important in the selection of a solvent for...
Question 17 1 pts What solubility properties are important in the selection of a solvent for recrystallisation? sparingly soluble in hot solvent and readily soluble in cold solvent readily soluble in both hot and cold solvent sparingly soluble in both hot and cold solvent readily soluble in hot solvent and sparingly soluble in cold solvent Question 18 1 pts How would you modify the procedure given in the Laboratory Manual if you did not know which solvent to use? 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...
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...
- 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 3 (4 points) The vapor pressure of a liquid is dependent on: the temperature of...
Question 3 (4 points) The vapor pressure of a liquid is dependent on: the temperature of the liquid and intermolecular forces of attraction in the liquid the temperature of the liquid and the surface area of the liquid only on the surface area of the liquid only the temperature of the liquid O only the forces of intermolecular attraction in the liquid Question 4 (4 points) If the atmospheric pressure over a sample of liquid is increased, the boiling point...
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...
Question 16 For which molecule below, the melting point was reported wrong by student? 5 pts...
Question 16 For which molecule below, the melting point was reported wrong by student? 5 pts Compound A) Naphthalene B) Benzophenone C) D-Anisic acid D) 3-Chlorobenzoic Observed MP 79-80° 45-47° 178-182 acid 157 Question 17 5 pts
5:02 .. LED Exit Question 5 1.25 pts What intermolecular forces are important for the molecule...
5:02 .. LED Exit Question 5 1.25 pts What intermolecular forces are important for the molecule below? [Check all that apply.] Dipole-Dipole Hydrogen Bonding lon-Dipole London Dispersion Forces None of these
Question 5 2 pts After looking at the products in the reaction above, what happens to...
Question 5 2 pts After looking at the products in the reaction above, what happens to the carbonate in limestone? The carbonate becomes which harms the sculpture or monument. gas gas and a solid solid liquid and a solid liquid gas and a liquid
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 17 1 pts What solubility properties are important in the selection of a solvent for recrystallisation? sparingly soluble in hot solvent and readily soluble in cold solvent readily soluble in both hot and cold solvent sparingly soluble in both hot and cold solvent readily soluble in hot solvent and sparingly soluble in cold solvent Question 18 1 pts How would you modify the procedure given in the Laboratory Manual if you did not know which solvent to use? 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...
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...
- 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 3 (4 points) The vapor pressure of a liquid is dependent on: the temperature of the liquid and intermolecular forces of attraction in the liquid the temperature of the liquid and the surface area of the liquid only on the surface area of the liquid only the temperature of the liquid O only the forces of intermolecular attraction in the liquid Question 4 (4 points) If the atmospheric pressure over a sample of liquid is increased, the boiling point...
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...
Question 16 For which molecule below, the melting point was reported wrong by student? 5 pts Compound A) Naphthalene B) Benzophenone C) D-Anisic acid D) 3-Chlorobenzoic Observed MP 79-80° 45-47° 178-182 acid 157 Question 17 5 pts
5:02 .. LED Exit Question 5 1.25 pts What intermolecular forces are important for the molecule below? [Check all that apply.] Dipole-Dipole Hydrogen Bonding lon-Dipole London Dispersion Forces None of these
Question 5 2 pts After looking at the products in the reaction above, what happens to the carbonate in limestone? The carbonate becomes which harms the sculpture or monument. gas gas and a solid solid liquid and a solid liquid gas and a liquid
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