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Colloid - Wikipedia, the free encyclopedia

Many familiar substances are colloids, as shown in the chart below. ... 8 Colloids in biology; 9 Colloids in the environment; 10 Use in intravenous therapy ... For example, if a colloid consists of a solid phase dispersed in a liquid, ...


From Yahoo Answers

Question:Colloids, Suspensions, and Solutions? What are they? Examples would be nice.

Answers:colloid- a type of mechanical mixture in which extreamly small particles are evenly and stably distributes in on or more others (e.g., whipped cream is a colloid of cream particles in the air) - so basically it is a soluble solid +liquid suspension-a mechanical mixture consisting if liquid or gas with small particles that are distributed through it, but that separate out if the suspension is left undisturbed -so basically a solid+liquid solution-a homogeneous mixture of 2 or more pure substances (e.g., vinegar, because only 1 form is visible, it is uniformed throughout)

Question:Describe each, base on particle size. Please give examples. 10 points for best answer P.S. open till 3 hours, it is my assigned work

Answers:A solution is a homogeneous mixture composed of two or more substances. In such a mixture, a solute is dissolved in another substance, known as a solvent. A common example is a solid, such as salt or sugar, dissolved in water, a liquid. Gases may dissolve in liquids, for example, carbon dioxide or oxygen in water. Liquids may dissolve in other liquids. A suspension is a heterogenous fluid containing solid particles that are sufficiently large for sedimentation. An example of a suspension would be sand in water. Unlike colloids, suspensions will eventually settle. A colloid is a type of mechanical mixture where one substance is dispersed evenly throughout another. http://en.wikipedia.org/wiki/Colloids#Classification_of_colloids

Question:i need to no it for exam tomorrow so please help me. 10 points best answer

Answers:solutions are things in which the two things completely dissolve into eachother. The particles are all smaller than 10^-9 meters like sugar water, salty water, ect.. things like that. Heterogeneous mixtures include all colloids and suspensions Colloids are things like toothpaste, milk, some sodas, the particles are in between 10^-7 and 10^-9 meters in size. The main difference between this and suspension is that colloidal particles never settle to the bottom, they all travel in zigzag movements called brownian movement Suspensions are ones in which the particles are all larger than 10^-7 meters in diameter. The particles settle to the bottom, some examples are muddy water. Sandy water, the particles settle to the bottom eventually.

Question:A student was given liquid and told that it contained a mixture. How could the student determine whether or not the mixture was a solution, suspension, or colloid?

Answers:Suspensions A suspension is a mixture between two substances, one of which is finely divided and dispersed in the other. Common suspensions include sand in water, dust in air, and droplets of oil in air. Particles in a suspension are larger than those in a solutions; they are visible under a microscope and can often be seen with the naked eye. Particles in a suspension will settle out if the suspension is allowed to stand undisturbed. Many particles of a suspension can be separated through a filter. An example of a simple suspension would be flour in water, or sand in water. Colloids A colloid is a type of mixture intermediate between a homogeneous mixture (also called a solution) and a heterogeneous mixture with properties also intermediate between the two. The particles in a colloid can be solid, liquid or bubbles of gas. The medium that they are suspended in can be a solid, liquid or gas (although gas colloids cannot be suspended in gas).The particles are approximately 10 to 10,000 angstroms in size and generally cannot be filtered, or settled out in an easy manner. Colloids may be colored or translucent because of the Tyndall effect, which is the scattering of light by particles in the colloid. Colloid particles may be seen in a beam of light such as dust in air in a "shaft" of sunlight. Brownian movement may be used to distinguish between solutions and colloids. Brownian motion is the random movement of colloidal particles suspended in a liquid or gas, caused by collisions with molecules of the surrounding medium. The particles in solutions and colloids are in constant motion. However colloid particles are large enough to be observed and are small enough to still be affect by the random molecular collisions. Colloid particles resist settling rapidly to the bottom of a vessel due to Brownian motion. Emulsions are a type of colloid Emulsions are an example of colloids composed of tiny particles suspended in another immiscible (unmixable) material. An emulsion is a suspension of two liquids that usually do not mix together. These liquids that do not mix are said to be immiscible. An example would be oil and water. If you mix oil and water and shake them a cloudy suspension is formed. Let the mixture rest and the oil and water will separate. An emulsifying agent (emulsifier) is any substance that keeps the parts of an emulsion mixed together. For example if we mix oil and water a suspension will form that over time separates. But now, if we add a few drops and shake the mixture the oil and water will stay mixed much longer. Examples of emulsions include butter and margarine, and mayonnaise. Examples of Colloids Dispersed Medium Gas Liquid Solid Continuous Medium Gas NONE (All gases are soluble) Liquid Aerosol Examples: Fog, Mist Solid Aerosol Examples: smoke, dust Liquid Foam Examples: Whipped cream Emulsion Examples: Milk, Mayonnaise, hand cream Sol Examples: Paint, pigmented ink, blood, Milk of Magnesia Solid Solid Foam Examples: Aerogel, Styrofoam, pumice Gel Examples: Gelatin, cheese Solid Sol Examples: ruby glass

From Youtube

Cornstarch Colloid :October 10th Science Experiment Cornstarch (amylose) and water can be considered a colloidal suspension. A colloidal suspension is a two-phase system in which the starch and water are not dissolved but simply mixed into a permanent suspension that will not settle on standing.

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