If water, isopropanol, toluene, and ethylene glycol were to be placed on a PDMS surface, which...
If water, isopropanol, toluene, and ethylene glycol were to be placed on a PDMS surface, which will be the order of greatest contact angle to smallest?
Homework Answers
Pdms is a organic polymer . It is basically a silicone . So it is attracted more towards electrons since silicon is electron defecient . So attraction is more towards toulene followed by ethylene glycol , isopropanol and water . So contact angle , i.e., tha angle between tangents drawn to surfaces , is more for more attracted molecules . So order is Toulene > Ethylene glycol > isopropanol > water .
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If water, isopropanol, toluene, and ethylene glycol were to be
placed on a PDMS surface, which...
In an ethylene glycol-water solution, there are 20.0 g ethylene glycol for every 80.0 g water....
In an ethylene glycol-water solution, there are 20.0 g ethylene glycol for every 80.0 g water. This solution is used for filling a 450.0 gallon reservoir. Suppose the density of this mixture solution is ρ= 1.0529 g/ml. (a) What is the molarity of this solution? (b) If you need to fill the 450.0 gallon tank in 170.0 s, what is the volumetric flow rate of the solution into the tank? (c) How many moles of ethylene glycol are in the...
An ethylene glycol contains 22.2 g of ethylene glycol (C_2H_6O_2) in 82.4 mL of water Calculate...
An ethylene glycol contains 22.2 g of ethylene glycol (C_2H_6O_2) in 82.4 mL of water Calculate the freezing point of the solution. (Assume a density of 1.00 g/mL for water.) Calculate the boiling point of the solution.
An ethylene glycol solution contains 27.6 g of ethylene glycol (C2H6O2) in 92.0 mL of water....
An ethylene glycol solution contains 27.6 g of ethylene glycol (C2H6O2) in 92.0 mL of water. (Assume a density of 1.00 g/mL for water.) Determine the freezing point of the solution. Determine the boiling point of the solution.
When water is added to ethylene glycol, the viscosity of the solution decreases when compared to...
When water is added to ethylene glycol, the viscosity of the solution decreases when compared to pure ethylene glycol. Which of the following is the BEST explanation of why this occurs? Ethylene glycol is thick and water is thin, so when mixed together it makes a medium thick solution The water molecules increase the intermolecular interactions between the ethylene glycol molecules, which allow them interact with other molecules, the resulting solution less viscous. The water molecules increase the intermolecular interactions...
An ethylene glycol solution contains 24.4 g of ethylene glycol (C2H6O2) in 85.4 mL of water....
An ethylene glycol solution contains 24.4 g of ethylene glycol (C2H6O2) in 85.4 mL of water. (Assume a density of 1.00 g/mL for water.) 1.Determine the freezing point of the solution. 2.Determine the boiling point of the solution.
An ethylene glycol solution contains 30.0g of ethylene glycol (C2H6O2) in 95.6mL of water. (Assume a...
An ethylene glycol solution contains 30.0g of ethylene glycol (C2H6O2) in 95.6mL of water. (Assume a density of 1.00 g/mL for water.) 1.Determine the freezing point of the solution. Express you answer in degrees Celsius 2.Determine the boiling point of the solution. Express you answer in degrees Celsius.
The liquid in automobile cooling systems is prepared by dissolving ethylene glycol (HOCH_2CH_2OH) in water. Ethylene...
The liquid in automobile cooling systems is prepared by dissolving ethylene glycol (HOCH_2CH_2OH) in water. Ethylene glycol has a molar mass of 62. 07 g/mol and a density 1. 115 g/ml at 50. 0 degree C. Calculate the vapor pressure at 50 degree C of a coolant solution that is 51. 0: 49. 0 ethylene glycol to water by volume At 50. 0degree C the density of water is 0. 9880 g/ml, and its vapor pressure is 92 torr. The...
An ethylene glycol solution contains 14.2 g of ethylene glycol (C2H6O2) in 83.4 mL of water....
An ethylene glycol solution contains 14.2 g of ethylene glycol (C2H6O2) in 83.4 mL of water. A.Calculate the freezing point of the solution. (Assume a density of 1.00 g/mL for water.) Express your answer in degrees Celsius using three significant figures. B. Calculate the boiling point of the solution. Express your answer in degrees Celsius using two decimal places.
A solution of ethylene glycol in water at 20 degrees celsius has a mass percent of...
A solution of ethylene glycol in water at 20 degrees celsius has a mass percent of 9.78% of ethylene glycol with a density of 1.0108 g/mL. The freezing point depression constant for water (solvent for all solutions) is Kf=-1.86 percent celsius kg/mol and the boiling point elevation constant is Kb=0.512 degrees celsius kg/mol. The density of neat water at 20.0 degrees celsius is 0.9982 g/mL. Answer the following: 1. What is the molarity of the solution? 2. What is the...
A solution of ethylene glycol in water at 20.0°C has a mass percent of 8.25% of...
A solution of ethylene glycol in water at 20.0°C has a mass percent of 8.25% of ethylene glycol with a density of 1.0087 g/mL. The freezing point depression constant for water (which you can assume is the solvent for all solutions) is K1.86°C kg/mol and the boiling point elevation constant is Kb the following: 0.512°C kg/mol. The density of neat water at 20.0°C is 0.9982 g/ml. Answer 1. What is the molarity of the solution? 2. What is the molality...
In an ethylene glycol-water solution, there are 20.0 g ethylene glycol for every 80.0 g water. This solution is used for filling a 450.0 gallon reservoir. Suppose the density of this mixture solution is ρ= 1.0529 g/ml. (a) What is the molarity of this solution? (b) If you need to fill the 450.0 gallon tank in 170.0 s, what is the volumetric flow rate of the solution into the tank? (c) How many moles of ethylene glycol are in the...
An ethylene glycol contains 22.2 g of ethylene glycol (C_2H_6O_2) in 82.4 mL of water Calculate the freezing point of the solution. (Assume a density of 1.00 g/mL for water.) Calculate the boiling point of the solution.
When water is added to ethylene glycol, the viscosity of the solution decreases when compared to pure ethylene glycol. Which of the following is the BEST explanation of why this occurs? Ethylene glycol is thick and water is thin, so when mixed together it makes a medium thick solution The water molecules increase the intermolecular interactions between the ethylene glycol molecules, which allow them interact with other molecules, the resulting solution less viscous. The water molecules increase the intermolecular interactions...
The liquid in automobile cooling systems is prepared by dissolving ethylene glycol (HOCH_2CH_2OH) in water. Ethylene glycol has a molar mass of 62. 07 g/mol and a density 1. 115 g/ml at 50. 0 degree C. Calculate the vapor pressure at 50 degree C of a coolant solution that is 51. 0: 49. 0 ethylene glycol to water by volume At 50. 0degree C the density of water is 0. 9880 g/ml, and its vapor pressure is 92 torr. The...
A solution of ethylene glycol in water at 20.0°C has a mass percent of 8.25% of ethylene glycol with a density of 1.0087 g/mL. The freezing point depression constant for water (which you can assume is the solvent for all solutions) is K1.86°C kg/mol and the boiling point elevation constant is Kb the following: 0.512°C kg/mol. The density of neat water at 20.0°C is 0.9982 g/ml. Answer 1. What is the molarity of the solution? 2. What is the molality...
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