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Questions and Answers
What is the main cause of Brownian motion?
What is the main cause of Brownian motion?
- Electric charge
- Thermal bombardment (correct)
- External application of force
- Gravitational force
How does the velocity of particles change with decreasing particle size?
How does the velocity of particles change with decreasing particle size?
- Remains constant
- Decreases
- Increases (correct)
- Stops completely
What is the main driving force behind diffusion?
What is the main driving force behind diffusion?
- Gravitational force
- Applied external force
- Brownian movement (correct)
- Electrically induced motion
What does Fick's first law relate to?
What does Fick's first law relate to?
What type of colloids are systems containing colloidal particles that interact significantly with the dispersion medium?
What type of colloids are systems containing colloidal particles that interact significantly with the dispersion medium?
How are lyophilic colloidal sols usually obtained?
How are lyophilic colloidal sols usually obtained?
What is the term for the attachment of solvent molecules to the molecules of the dispersed phase in hydrophilic colloids?
What is the term for the attachment of solvent molecules to the molecules of the dispersed phase in hydrophilic colloids?
Which of the following materials produce lyophilic colloids in aqueous dispersion media?
Which of the following materials produce lyophilic colloids in aqueous dispersion media?
What does the negative sign in the equation for diffusion signify?
What does the negative sign in the equation for diffusion signify?
Which particles diffuse faster in a given media?
Which particles diffuse faster in a given media?
What is the relationship between osmosis and diffusion?
What is the relationship between osmosis and diffusion?
What does the van't Hoff equation π = cRT describe?
What does the van't Hoff equation π = cRT describe?
What does the negative sign in the equation for diffusion signify?
What does the negative sign in the equation for diffusion signify?
What is the van't Hoff equation used to calculate?
What is the van't Hoff equation used to calculate?
In which type of media do smaller particles diffuse faster?
In which type of media do smaller particles diffuse faster?
What is the main action involved in osmosis?
What is the main action involved in osmosis?
What is the basis of classifying dispersed systems according to the mean particle diameter of the dispersed material?
What is the basis of classifying dispersed systems according to the mean particle diameter of the dispersed material?
Which types of dispersed systems are generally considered based on the size of the dispersed phase?
Which types of dispersed systems are generally considered based on the size of the dispersed phase?
What is the size range assigned to colloidal dispersions?
What is the size range assigned to colloidal dispersions?
What is the dispersed material in dispersed systems?
What is the dispersed material in dispersed systems?
What characterizes lyophobic colloids?
What characterizes lyophobic colloids?
In which dispersion medium may a material form a lyophilic colloidal system?
In which dispersion medium may a material form a lyophilic colloidal system?
What is a characteristic of association or amphiphilic colloids?
What is a characteristic of association or amphiphilic colloids?
What type of particles are generally found in lyophobic colloids?
What type of particles are generally found in lyophobic colloids?
Which characteristic best describes colloidal dispersion based on particle size?
Which characteristic best describes colloidal dispersion based on particle size?
What technique can be used to separate colloidal particles from molecular particles?
What technique can be used to separate colloidal particles from molecular particles?
Which type of dispersion medium allows the formation of lyophobic colloidal systems?
Which type of dispersion medium allows the formation of lyophobic colloidal systems?
What is the size range assigned to colloidal dispersions based on the text?
What is the size range assigned to colloidal dispersions based on the text?
What are the factors affecting the sedimentation of particles in a dispersion medium?
What are the factors affecting the sedimentation of particles in a dispersion medium?
What is the lower size limit of particles obeying Stokes's equation when subjected only to the force of gravity?
What is the lower size limit of particles obeying Stokes's equation when subjected only to the force of gravity?
What device is used to produce a force one million times that of gravity to bring about the sedimentation of colloidal particles?
What device is used to produce a force one million times that of gravity to bring about the sedimentation of colloidal particles?
What promotes mixing instead of sedimentation due to gravity for particles below the lower size limit obeying Stokes's equation?
What promotes mixing instead of sedimentation due to gravity for particles below the lower size limit obeying Stokes's equation?
What is the term for the process in which dispersed particles come together to form aggregates over a narrow concentration range?
What is the term for the process in which dispersed particles come together to form aggregates over a narrow concentration range?
In which type of colloidal dispersion would the diameter of each micelle be approximately 50 Ã…?
In which type of colloidal dispersion would the diameter of each micelle be approximately 50 Ã…?
What is the main effect on the viscosity of the dispersion medium when lyophobic colloidal particles are present?
What is the main effect on the viscosity of the dispersion medium when lyophobic colloidal particles are present?
What is the term for the primary cause of the desolvation of lyophilic molecules in the presence of high concentrations of very soluble electrolytes?
What is the term for the primary cause of the desolvation of lyophilic molecules in the presence of high concentrations of very soluble electrolytes?
In which type of dispersion system does the critical micelle concentration decrease with the addition of electrolytes in aqueous solutions?
In which type of dispersion system does the critical micelle concentration decrease with the addition of electrolytes in aqueous solutions?
What is the term for the process where a sol may become a gel at sufficiently high concentrations of dispersed phase?
What is the term for the process where a sol may become a gel at sufficiently high concentrations of dispersed phase?
What property generally characterizes lyophobic colloids in the presence of electrolytes?
What property generally characterizes lyophobic colloids in the presence of electrolytes?
What is the term for when colloidal aggregates are formed spontaneously when the concentration of amphiphile exceeds a certain value?
What is the term for when colloidal aggregates are formed spontaneously when the concentration of amphiphile exceeds a certain value?
What happens to the velocity of particles as micelles increase in number and become asymmetric in an association (amphiphilic) dispersion?
What happens to the velocity of particles as micelles increase in number and become asymmetric in an association (amphiphilic) dispersion?
What is the term for when dispersed particles come together to form aggregates over a narrow concentration range?
What is the term for when dispersed particles come together to form aggregates over a narrow concentration range?
What is the term for the process that causes lyophobic dispersions to be unstable in the presence of even small concentrations of electrolytes?
What is the term for the process that causes lyophobic dispersions to be unstable in the presence of even small concentrations of electrolytes?
