Homework Answers
2) Addition of impurity to pure solvent causes depression in freezing point i.e. freezing point solution will be lower than the pure solvent.
Hence, addition of CaF2 to tert-butanol will cause depression in freezing point. Yes
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a) Yes b) No c) Depends on the nature of the impurny 2) Would the freezing...
Chem 1312-1112 LAB VI-Molar Mass by Freezing Point-(Colligative Properties) 1) Would the boiling point of tert-butanol...
Chem 1312-1112 LAB VI-Molar Mass by Freezing Point-(Colligative Properties) 1) Would the boiling point of tert-butanol also be affected by the same impurity you used in the freezing point depression experiment? a) Yes b) No c) Depends on the nature of the impurity
4) Tert-butanol is an alcohol. Would the addition of another alcohol as the impurity have affected the freezing poi...
4) Tert-butanol is an alcohol. Would the addition of another alcohol as the impurity have affected the freezing point and boiling point of tert-butanol? a) Yes, because colligative properties depend on the number of impurity particles and NOT on their chemical properties b) No, because colligative properties depend on the chemical properties of the impurity and NOT on the amount of particles c) Only if the same amounts of the alcohol impurity and tert-butanol are mixed
Lab 3: Determination of Molar Mass by Freezing Point Depression 1 During winter, several different "salts"...
Lab 3: Determination of Molar Mass by Freezing Point Depression 1 During winter, several different "salts" are used to melt ice sodium chloride (NaCI), a mix of sodium chloride and magnesium chloride (NaCl and MgCla calcium magnesium acetate (CaMg(CHO)). Assume you have 1 mole of each of these in 1 kg of water. Compare the freezing point depressions of these three "salts." a. b. What is the ratio of moles of "salt" to freezing point depression for each? What is...
A Freezing-Point Depression experiment is done using 2 different test tubes to find the molecular weight...
A Freezing-Point Depression experiment is done using 2 different test tubes to find the molecular weight of an unknown mixture. Tube 1 consists of pure Lauric acid, and Tube 2 consists of Lauric acid + an unknown solute mixture. From the calculations of this experiment, the molecular weight of the unknown acid can be found. A) How would the loss of some Lauric acid from Test Tube 1 have affected the calculation of a molecular weight? Would the calculated molecular...
Hi, I need some help with Chemistry. Q1: Q2: Here is some background for the questions: Thank y...
Hi, I need some help with Chemistry.
Q1:
Q2:
Here is some background for the questions:
Thank you in advance.
You add 0.0336 moles of benzoic acid solute to 16.00 g of an unknown solvent, which lowers the freezing point of the solvent by 8.6 °C. Calculate the freezing point depression constant (Kf) of the unknown solvent. You dissolve 1.00 g sample of an unknown solute is in 8.00 g of lauric acid, which lowers the freezing point by 5.0...
If the freezing point of the solution had been incorrectly read 0.3 °C lower than the...
If the freezing point of the solution had been incorrectly read 0.3 °C lower than the true freezing point, would the calculated molar mass of the solute have been too high or too low? Explain. Select all that apply. Select all that apply. The resulting molar mass (g/mol) would be smaller since the mol term is in the denominator. A larger ΔT results in a lower calculated molality of the solution, and thus smaller number of moles. The resulting molar...
5) If you had measured the vapor pressure of the tert-butanol solution that you prepared in...
5) If you had measured the vapor pressure of the tert-butanol solution that you prepared in the lab, would you have expected the vapor pressure to be: a) Elevated b) Lowered c) Stay the same
Colligative Properties: Freezing Point Depression Lauris acid is added to a test tube and heated. The...
Colligative Properties: Freezing Point Depression Lauris acid is added to a test tube and heated. The test tube is placed in water to freeze the lauric acid. After measuring the temperature, an unknown is added. The lauric acid and unknown are heated to a liquid and placed in cold water(Part B). In doing part B of this experiment, Group 1 removes the thermometer and stirring wire to add the unknown, and wipes them off, losing 0.25 g of lauric acid....
What freezing point depression would have resulted if the 0.59 g of hexane had been dissolved...
What freezing point depression would have resulted if the 0.59 g of hexane had been dissolved in 20.6 g of PDB instead (K_f = -7.10 degree C/m). The answer is negative, function, include the negative sign)
A. A B. B C. A or B D. A and B . It depends if...
A. A B. B C. A or B D. A and B . It depends if the organism is prokaryotic or eukaryotic. 7. You have performed the following mating experiment using Hfr and F- strains of Escherichia coli: Hfr (thr+ leu- strs) x F- (thr- leu- str). Which of the following selective media would you use to grow only recombinant colonies? A) Complete media B) Minimal Media C) Minimal Media + streptomycin D) Minimal Media + leucine E) Minimal Media...
Chem 1312-1112 LAB VI-Molar Mass by Freezing Point-(Colligative Properties) 1) Would the boiling point of tert-butanol also be affected by the same impurity you used in the freezing point depression experiment? a) Yes b) No c) Depends on the nature of the impurity
4) Tert-butanol is an alcohol. Would the addition of another alcohol as the impurity have affected the freezing point and boiling point of tert-butanol? a) Yes, because colligative properties depend on the number of impurity particles and NOT on their chemical properties b) No, because colligative properties depend on the chemical properties of the impurity and NOT on the amount of particles c) Only if the same amounts of the alcohol impurity and tert-butanol are mixed
Lab 3: Determination of Molar Mass by Freezing Point Depression 1 During winter, several different "salts" are used to melt ice sodium chloride (NaCI), a mix of sodium chloride and magnesium chloride (NaCl and MgCla calcium magnesium acetate (CaMg(CHO)). Assume you have 1 mole of each of these in 1 kg of water. Compare the freezing point depressions of these three "salts." a. b. What is the ratio of moles of "salt" to freezing point depression for each? What is...
Hi, I need some help with Chemistry.
Q1:
Q2:
Here is some background for the questions:
Thank you in advance.
You add 0.0336 moles of benzoic acid solute to 16.00 g of an unknown solvent, which lowers the freezing point of the solvent by 8.6 °C. Calculate the freezing point depression constant (Kf) of the unknown solvent. You dissolve 1.00 g sample of an unknown solute is in 8.00 g of lauric acid, which lowers the freezing point by 5.0...
5) If you had measured the vapor pressure of the tert-butanol solution that you prepared in the lab, would you have expected the vapor pressure to be: a) Elevated b) Lowered c) Stay the same
What freezing point depression would have resulted if the 0.59 g of hexane had been dissolved in 20.6 g of PDB instead (K_f = -7.10 degree C/m). The answer is negative, function, include the negative sign)
A. A B. B C. A or B D. A and B . It depends if the organism is prokaryotic or eukaryotic. 7. You have performed the following mating experiment using Hfr and F- strains of Escherichia coli: Hfr (thr+ leu- strs) x F- (thr- leu- str). Which of the following selective media would you use to grow only recombinant colonies? A) Complete media B) Minimal Media C) Minimal Media + streptomycin D) Minimal Media + leucine E) Minimal Media...
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