why lyophobic sols are called irreversible sols?
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In Lyophobic sol, weak forces of interaction exist between colloidal particles and liquid. ... 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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As their name suggests, these packs can only be used for cold therapy, and not the other way around. They're also single-use packs, so once the chemical reaction is done, you have to dispose of the packs properly. You can't refreeze or reuse them after that.
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But there is another type of reaction that will also push the reactants to products and that is an Oxidation-Reduction (Redox) reaction which is driven by the irreversible transfer of electrons. I say this reaction is "irreversible" because the spontaneous transfer of electrons only proceeds in one direction.
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Because ice's thermal conductivity is low, like the thermal conductivity of air, an igloo works by stopping heat being transferred into the surroundings, even when the temperature is really low. The ice and the still, unmoving air both act as highly effective insulators.
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Arsenious sulphide, As2S3 is a lyophobic colloid. It is obtained by the hydrolysis of arsenious oxide (AS203) with boiling distilled water, followed by passing H2S gas through solution obtained.
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If the molecules are held tightly together by strong intermolecular forces, few of the molecules will have enough kinetic energy to separate from each other. They will stay in the liquid phase, and the rate of evaporation will be low.
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Type I fluids have a low viscosity, and are considered "unthickened". They provide only short term protection because they quickly flow off surfaces after use. They are typically sprayed on hot (130–180 °F, 55–80 °C) at high pressure to remove snow, ice, and frost.
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Reversibility and irreversibility In many cases, denaturation is reversible (the proteins can regain their native state when the denaturing influence is removed). This process can be called renaturation.
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Some oxidizing materials are also incompatible with non-combustible materials. These oxidizers can undergo dangerous reactions with water, inorganic acids or even other oxidizing materials.
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Litmus paper contains chemicals which may leach into the sample. In cases where you need a very pure solution, this means you might have to throw out the sample after testing, effectively wasting it.
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A lower critical solution temperature (LCST) occurs in this system. That is, at temperatures below the LCST, the liquids are totally miscible, but with heating, the mixture separates into two phases.
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The Brønsted-Lowry theory does not go against the Arrhenius theory in any way - it just adds to it. Hydroxide ions are still bases because they accept hydrogen ions from acids and form water. An acid produces hydrogen ions in solution because it reacts with the water molecules by giving a proton to them.
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We call substances that dissolve in water soluble. Sugar and salt are examples of soluble substances. Substances that do not dissolve in water are called insoluble. Sand and flour are examples of insoluble substances.
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If more energy is taken in than released, then the process is endothermic, making the solution feel cooler. Commercially, there are 2 other commonly sold types of instant hot packs. One heats up when exposed to air. This hot pack functions as iron reacts with oxygen to form iron (III) oxide, an exothermic reaction.
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Fluids that mix or dissolve in each other in all proportions are call miscible fluids, lacking that property fluids are called immiscible. So gases are always miscible. The number of grams of solute that can just be dissolved in 100 ml of solvent at 20 C is defined as the solubility (36g for NaCl).
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Substances that do not dissolve in water are called insoluble. Sand and flour are examples of insoluble substances.
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Condensation is the change of state from gas to liquid. Freezing is the change of state from liquid to solid.