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Suppose that you have two different solutions made using the same solvent. When you cool the firs...
Suppose that you have two different solutions made using the same solvent. When you cool the...
Suppose that you have two different solutions made using the same solvent. When you cool the first one, the entire solution freezes at a single temperature. When you cool the second one, however, the solution startsfreezing at one temperature, but the temperature is different when it finishes freezing. Which of the two solutions has the lower freezing point, and why?
Two aqueous solutions are found to have different freezing points: Solution A freezes at 260 K...
Two aqueous solutions are found to have different freezing points: Solution A freezes at 260 K and Solution B freezes at 250 K. Which statement is true? Select one: Solution A has a higher osmolar concentration, Solutions A and B have equal osmolar concentrations, Solution B has a higher osmolar concentration The identity of the solute must be known to compare freezing points. The volume of the solutions must be known before the freezing points can be compared Which of...
You have three solutions each containing the same concentration of a different protein. Two of these...
You have three solutions each containing the same concentration of a different protein. Two of these proteins have 2 Trp in their sequence, whereas the third one only contains one Tyr and one Phe. Which protein solutions will show the highest absorbance at 280nm? Why?
QUESTION 4 If you take a 171 mL of a 1.4 M NaCl solution and dilute...
QUESTION 4
If you take a 171 mL of a 1.4 M NaCl solution and dilute it to
500 mL, what is the molarity of the final solution?
Enter the numerical answer in decimal notation
QUESTION 10
Information - Colligative
Properties
Colligative properties of solutions are those properties which
depend only on the number of dissolved solute particles in solution
not the chemical properties of the solute. For example when a
solute is dissolved in a solvent, vapor pressure
depression...
1. Explain how a fractionating column increases the separation of two liquids. 2. What is an...
1. Explain how a fractionating column increases the separation of two liquids. 2. What is an azeotrope? Do you think the mixture used in the lab is an example of an azeotrope? Explain. 3. Explain how the boiling point of a liquid is affected by the addition of a non-volatile solute (hint: it is a colligative property). Is the temperature above such solution lower, higher or the same as the pure liquid? Explain why. 4. You were asked to record...
You have two solutions that emit the same amount of fluorescence when excited at 488 nm....
You have two solutions that emit the same amount of fluorescence when excited at 488 nm. One has a fluorescence lifetime of 1 ns and the other has a fluorescence lifetime of 5 ns. You mix the two solutions in the ratio 2:1 in a cuvette (2 times the 1 ns solution and 1 time the 5 ns solution) in a cuvette. Calculate the value of the average fluorescence lifetime tav for this mixture in the cuvette.
Same Question and data but different parts. Please solve for all three. Last attempt left QUESTION...
Same Question and data but different parts. Please solve for all
three. Last attempt left
QUESTION 1 The data given in question-1 is used in the remainder of the postlab assignment questions. A 2.0 g of unknown material was dissolved in 9.00 mL of water (density of water = 1.0 g/mL) The freezing point of pure water is 0.00 °C and Kf of water is 1.86 °C/m. If the solution made above shows a new freezing point at -2.76 °C,...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography?...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography? 3. Why is it important to keep the spots on the paper as small as possible? 4. If the solvent pool at the bottom of the beaker touched the spots on the 1.5cm line, what would happen to the spots? How would you address this error? 5. If you were teaching a student how to do paper chromatography, what three pieces of...
Recrystallization of Acetanilide was conducted using water as our solvent. First we had to choose a...
Recrystallization of Acetanilide was conducted using water as our solvent. First we had to choose a solvent based (water was chosen as our solvent due to it not dissolving acetanilide at room temp but dissolved it when heated) Then we performed recrystallizaation, vacuum filtration and then melting point measurements. For the post lab discussion for recrystallization of acetanilide report we have to address several different arguments. The ones below I'm not sure what to focus on to completely defend what...
Answer the following questions using complete sentences and support your answers with calculations, if desired. Attach...
Answer the following questions using complete sentences and support your answers with calculations, if desired. Attach additional pages as necessary. Handwritten or typed answers are acceptable. (5 pts per question) 1. Describe in your own words or figures why the addition of non-volatile solutes lower the freezing point of a solvent. 2. If salicylic acid dissociated into two particles when dissolved into myristic acid (it does not), would this change your calculated K value? Explain why. (Hint: look over your...
Two aqueous solutions are found to have different freezing points: Solution A freezes at 260 K and Solution B freezes at 250 K. Which statement is true? Select one: Solution A has a higher osmolar concentration, Solutions A and B have equal osmolar concentrations, Solution B has a higher osmolar concentration The identity of the solute must be known to compare freezing points. The volume of the solutions must be known before the freezing points can be compared Which of...
QUESTION 4
If you take a 171 mL of a 1.4 M NaCl solution and dilute it to
500 mL, what is the molarity of the final solution?
Enter the numerical answer in decimal notation
QUESTION 10
Information - Colligative
Properties
Colligative properties of solutions are those properties which
depend only on the number of dissolved solute particles in solution
not the chemical properties of the solute. For example when a
solute is dissolved in a solvent, vapor pressure
depression...
Same Question and data but different parts. Please solve for all
three. Last attempt left
QUESTION 1 The data given in question-1 is used in the remainder of the postlab assignment questions. A 2.0 g of unknown material was dissolved in 9.00 mL of water (density of water = 1.0 g/mL) The freezing point of pure water is 0.00 °C and Kf of water is 1.86 °C/m. If the solution made above shows a new freezing point at -2.76 °C,...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography? 3. Why is it important to keep the spots on the paper as small as possible? 4. If the solvent pool at the bottom of the beaker touched the spots on the 1.5cm line, what would happen to the spots? How would you address this error? 5. If you were teaching a student how to do paper chromatography, what three pieces of...
Answer the following questions using complete sentences and support your answers with calculations, if desired. Attach additional pages as necessary. Handwritten or typed answers are acceptable. (5 pts per question) 1. Describe in your own words or figures why the addition of non-volatile solutes lower the freezing point of a solvent. 2. If salicylic acid dissociated into two particles when dissolved into myristic acid (it does not), would this change your calculated K value? Explain why. (Hint: look over your...
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