A colloid is a substance in which microscopically dispersed insoluble particles are suspended throughout another substance.
Questions tagged [colloids]
93 questions
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Colloids dispersion classification
I've been teaching chemistry for 25 years, but now I'm confused. Is a colloidal dispersion a heterogeneous or homogeneous mixture? I've seen both answers on the web.
Elene F.
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Why don't particles of a colloid settle?
Why don't particles of a colloid settle but those of a suspension do?
- Is it because they are really small and so remain in constant motion which overcomes the force of gravity and prevents them from settling?
- Is it because they are charged and…
Arpita Karkare
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Movement of solid particles in colloids
A liquid is made up of tiny vibrating particles of matter, such as atoms, held together by intermolecular forces. Where a solid is the same, but the atoms have much less freedom of movement.
Even if the water is still, its molecules are still moving…
Renier
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Temperature and zeta potential
What is the temperature effect on zeta potential?
My problem was assigned by my teacher for the final exam preparation: "When the temperature is increased, and given in this temperature range, there is no desorption of potential-determining ions on…
Shira
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Why does a low concentration of soap in water behave as a strong electrolytes?
According to my text, "a colloid in which the dispersed phase consists of micelles is called an association colloid." An example would be soap in water. They use the term 'associated colloid' and 'association colloid' interchangeably.
They state…
Arnab Chowdhury
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Scattering of light
How does the path of light become visible due to scattering of light?
According to me it only indicates the presence of colloidal particles, but my book gives the example of a cinema hall projector and says that you could see the path of light due…
user47125
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How does total depth affect the colloid gradient?
When a colloid reaches diffusion–sedimentation equilibrium, it creates a gradient where the solute concentrates toward the surface or the bottom of the vessel based on its density relative to the solvent even though it never completely…
Nosajimiki
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Charges in colloidal dispersion
How does charge come on dispersion medium in colloidal sols ? (It is said that in electro-osmosis flow of dispersion medium takes because it is also electrically charged, but why ? )
user47125
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Why is micelle formation endothermic?
Most websites mention that it is endothermic and some mention that it is endothermic at low temp. and exothermic at high temp. Nor do I know the correct answer neither I can guess the reason for any of them. An explanation would be a great help.
dishant ranparia
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Particle tracking in colloids and uniformity in fractional part function
I don't know if its right place to ask this question since chemistry and programming both are involved.
I was working on particle tracking of series of pictures (.tiff) of colloids. And I was Using trackpy in python.
The code gives me the position…
crabNebula
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Why does Tyndall scaterring produce conical shape?
When light is passed through a collidal solution, due to Tyndall scattering, the path of light appears to be a bright cone. Why does it have to form only a conical shape?
The conditions for Tyndall effect are that the diameter of dispersed particles…
user600016
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