why tyndall effect is observed only in colloids?
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The Tyndall effect is the scattering of light as a light beam passes through a colloid. The Tyndall effect is due to the fact that colloidal particles scatter light in all directions in space. This scattering of light illuminates the path of the beam in the colloidal dispersion.
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When NaCl is added to the phenol-water system, the solution immediately shows turbidity. Organic compounds are readily soluble in phenol.
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The cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension. The molecules at the surface do not have other like molecules on all sides of them and consequently they cohere more strongly to those directly associated with them on the surface.
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Explanation: Tyndall's effect is the appearance of light scattering on the particles of colloidal dimensions. In colloid systems, the dispersed-phase particle size is 1 to 200 nm and in solutions the particle size is less than 1 nm. Because of the small particle size, the solutions do not show Tyndall's effect.
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Our model shows that as grain size increases, the weathering rate initially decreases; however, beyond a critical size no significant decrease in the rate is observed. This transition occurs when the density of reactive boundaries is less than ∼ 20 % of the entire domain.
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Particles, such as electrons, also exhibit such interference and so also behave as waves. But with only one slit in the barrier, both light and electrons behave as particles, producing no interference pattern. This principle of wave-particle duality has been challenged, but a new analysis reaffirms it.
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In alkyl halides, there exist dipole-dipole attractions where as in water van der waal's forces or the hydrogen bonding exists.. It is difficuilt for alkyl halides to break these hydrogen bonds, hence making them almost insoluble in water..
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Particles in a solution are mixed together evenly. ... This makes the solution look like one substance. Particles in a mechanical mixture are not mixed evenly. The particles stay together in groups.
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However addition of very large quantities of electrolytes can cause particles to precipitate. If large quantity of liquid is added to precipitations or the colloidal solution is stirred properly lyophilic sols can regain their original state. This shows that lyophilic sols are also reversible in nature.
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The carboxyl groups of EDTA are not dissociated at low pH. Undissociated carboxyls (COOH) have no charge because the hydrogen is covalently bound and therefore acid EDTA is almost insoluble in water.
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A small number of alpha particles being deflected at large angles suggested that there is a concentration of positive charge in the atom. Like charges repel, so the positive alpha particles were being repelled by positive charges.
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Answer and Explanation: Naphthalene is insoluble in water because it is non-polar. This means that it cannot participate in dipole-dipole interactions or hydrogen bonding...
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As the temperature of water increases, the particles of solid Potassium Nitrate, KNO3, which are absorbing energy from its surrounding, start moving more easily between the solution and its solid state this can as, according to the second law of thermodynamics, the particles will shift to the more disordered state ...
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The dark field microscope produces a light cone, which reaches the objective only when it is scattered by the sample. This reinforces the image contrast. The phase contrast microscope modifies the light trajectory so that part of the beam is modified by the sample and part is not.
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Liquid-Liquid Solutions. Nonpolar compounds do not dissolve in water. The attractive forces that operate between the particles in a nonpolar compound are weak dispersion forces. However, the nonpolar molecules are more attracted to themselves than they are to the polar water molecules.
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Addition of even small quantities of electrolytes can cause particles to precipitate. Unlike Lyophilic colloids, the precipitations of lyophobic colloids do not regain their original state as coagulated mass cannot be dispersed into colloidal form. This shows that lyophobic sols are also irreversible in nature.
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Nonpolar compounds do not dissolve in water. The attractive forces that operate between the particles in a nonpolar compound are weak dispersion forces. However, the nonpolar molecules are more attracted to themselves than they are to the polar water molecules.