Which of the following methods is NOT suitable for concentrating a protein solution?
Simple distillation
Ultrafiltration
Lyophilization
Dialysis against a concentrated polymer solution
Related Questions
The speed of sound in air is dependent on temperature. Which of the following correctly describes this relationship?
Speed of sound decreases with increasing temperature
Speed of sound increases with increasing temperature
Speed of sound is independent of temperature
Speed of sound initially increases then decreases with increasing temperature
Which of the following physical properties of a metal is significantly affected by changes in temperature?
Density
Mass
Volume
Resistivity
A standard solution is one whose :
Concentration is 1
Concentration is unknown
Concentration is known
None of the above
A solution is prepared by dissolving 10 g of glucose in 190 g of water. What is the mass percentage of glucose in the solution?
5%
10%
2%
95%
A binary solution of liquids A and B shows positive deviation from Raoult's law. Which of the following statements is TRUE?
The intermolecular forces between A and B are weaker than those between A-A and B-B.
The intermolecular forces between A and B are stronger than those between A-A and B-B.
The solution exhibits a negative deviation from Raoult's law.
The total vapor pressure of the solution is less than the sum of the vapor pressures of the pure components.
A colloidal solution of gold nanoparticles is prepared by reduction of . Which of the following methods is MOST EFFECTIVE for purifying this solution from excess reactants and small ionic byproducts?
Filtration
Centrifugation
Dialysis
Evaporation
In chromatography, the component that travels the furthest on the chromatogram is the one that is:
Most soluble in the mobile phase and least adsorbed to the stationary phase
Least soluble in the mobile phase and most adsorbed to the stationary phase
Equally soluble in both phases
Insoluble in both phases
How many moles of solute are present in a 2 molal solution containing 250g of solvent?
0.25 moles
0.5 moles
1 mole
2 moles
In a solution containing 0.1 moles of a solute and 5 moles of solvent, what is the mole fraction of the solvent?
0.02
0.10
0.98
5.0
Which of the following describes a 0.5 molal solution?
0.5 moles of solute in 1 kg of solvent
1 mole of solute in 0.5 kg of solvent
0.5 moles of solute in 0.5 kg of solvent
1 mole of solute in 1 kg of solvent
