why coloured soap makes white foam?
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I think I heard this answered before somewhere. If I remember corretly it's that the amount of coloured pigment in the soap is tiny. When 'foamed up' the actual foam is only a few microns thick...so thin that the colour pigment (which was a small % in the first place) can't be seen?
558973
I think the question is: Why is the perspiration stains yellow on a white shirt during the summertime?\n\nIt may be a chemical reaction to your deodorant or a medicine.
846935
The only agent used that is white (it actually looks like milk) is a drug called propofol (diprivan) and is used as an induction agent. I don't know of anything called "purple foam"  unless it is a street name for this drug.  Propofol is short acting and has fewer side effects than Pentothal (such as nausea/vomiting).  The down-side is that it burns if administered too fast, but this can be prevented by giving xylocaine prior to the propofol.  I can't imagine anyone using propofol as a recreational street drug as it is extremely potent and will render a person unconscious easily to the point of death.  This is a drug that should only be used while under the care of your anesthesia provider !!
768318
I hate to point out the obvious, but white-wash is a type of wood covering, much like painting, but cheaper. It uses lime and chalk in water to paint over a wooden surface to protect it from decay. It washes off after a while, and has to be repeated, but doesn't cost that much.\n\nThere are no negative or racial connotations to the term white-wash. Unless you're not really that bright.
971090
A soap bubble falls to the bottom of an open tank filled with air. When the same tank is filled with gaseous carbon dioxide, a similar bubble floats.\n\nCabbage juice is placed in a large flask. Vinegar is added to the point of color change. Aqueous ammonia is then added to the point of color change. Vinegar is then added again to show the reversibility of the color change.
963521
I'll answer the last part of your question first. Soap is made up of polar molecules. That just means that one end of each molecule is different from the other like the poles of a magnet. One end dissolves in grease and fats while the other end dissolves in water. Since most really dirty things are fatty and greasy, this means that one end of each soap molecule sticks to the dirt on your hands while the other end sticks to the water running over them. This washes the dirt away. Why not use plain water? If you don't have soap plain water will help get you clean but because of surface tension water won't stick to grease so you will never get completely clean. Another class of cleaners solves this problem. Detergents reduce the surface tension of water allowing it to clean better. Look at the list of ingredients on your cleanser. If one of them is Sodium Lauryl Sulfate, your cleanser is a detergent. Now for the first part of your question. Long ago people found that you could make a cleaner by heating lard (renderings from animals killed for food) with potash, an alkali produced by burning wood, probably for cooking the aforementioned food. This discovery was probably accidental, the result of being in the right place at the right time. It took place so long ago that the discoverer (or discoverers, it probably happened in several places at different times) is lost in history. BTW. It's no coincidence that many of today's soap producers are owned by or connected to slaughter houses and meat producers. Do some research on Procter and Gamble. Your teacher will be proud of you.
320794
Aeration of the liquid causes the whitish tinge, but essentially it is not white. You can compare two liquid's froth and notice a slight color difference in the froth. It may just be a hint, but it's there.
1022325
The CD's concentric ridges separates white light into all the colours that make it up. The colours you see reflecting from a CD are INTERFERENCE of colors , like the colours you see on a soap bubble or an oil slick.
563015
actually its the friction that removes the germs not the soap.the soap binds with oils,grease and dead skin cells to remove them.
904092
A soap is a surface active agent, which  means it attaches to the surface of a substance or slightly alters the surface energy of the substance.  When two materials are brought into contact suchs as two liquids or a solid and a liquid, or two solids, the differences in the surface energies will determine whether the are immiscible or , in the case of solids, one wets the surface of another or simply beads up on it.  \n\nThe best "soap" needs to be chosen based on what the liquid chemistry is.  For example, if you want to mix a material in water or alcohol or oil.  Each could require a different "soap" to be used.
1118703
your ovalating! it like clear mucousy stuff that come out but after it dries it becomes white.
993994
This is because some of the protein from the meat  comes out while you are cooking it, and that is what the white foam is at the top of the water.
98561
The manufacture of soap is based on a chemical reaction (saponification) in which an alkali acts upon a fat to form a metal salt (soap) and an alcohol (glycerol).\n\nYou can get more information in the link below.
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Soaps are water-soluble sodium or potassium salts of fatty acids.Saponification of fats and oils is the most widely used soapmaking process.\nDetergent surfactants are made from a variety of petrochemicals (derived from petroleum) and/or oleochemicals (derived from fats and oils). \n\nCheck these links to find more information On Soaps & detergents to help your chemistry Project.
352333
Shower gel is basically just a detergent (like mild green Fairy Liquid!), and what a detergent does is to break down the surface tensions of water & oils to make them more "mixable", so you can wash away the grime.  In doing so, millions of tiny little bubbles form (plus of course bigger ones that you can see) and these bubbles have trapped air in them. All the little bubbles act as  reflecting surfaces, so since most of the light reaching them is white (from the sun or your light bulb) the reflected and scattered light coming back at you looks white.
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foam \n \nBeach foam.The most general definition of foam is a substance that is formed by trapping many gas bubbles in a liquid or solid. It can also refer to anything that is analogous to such a phenomenon, such as quantum foam. Often people mean polyurethane foam (foam rubber), Styrofoam or some other manufactured foam when they are using the term.\n\nFrom the early 20th century, various types of specially manufactured solid foams came into use. The low density of these foams made them excellent as thermal insulators and flotation devices, and their lightness and compressibility made them ideal as packing materials and stuffings. Some liquid foams, called fire retardant foams, found use in extinguishing fires, especially oil fires.\n\nFoam, in this case meaning "bubbly liquid", is also produced as an often unwanted by-product in the manufacture of various substances. For example, foam is a serious problem in the chemical industry, especially for biochemical processes. Many biological substances, for example proteins, easily create foam on agitation and/or aeration. Foam is a problem because it alters the liquid flow and blocks oxygen transfer from air (therefore preventing microbial respiration in fermentation processes). For this reason, anti-foaming agent compounds, like silicone oils, are added to prevent these problems.\n\nIf foaming is desired, a foaming agent may help.\n\nFoaming around the mouth can be a symptom of rabies in animals. The term sea foam is used to describe the foam that forms on top of seawater from the action of waves. In some ways, leavened bread is a foam, as the yeast causes the bread to rise by producing tiny bubbles of gas in the dough.\n\n\nStructure of foams\nReal-life foams are typically disordered and have a variety of bubble sizes. The study of idealised foams is closely linked to the mathematical problems of space-filling and minimal surfaces. The Weaire-Phelan structure is believed to be the best possible (optimal) unit cell of a perfectly ordered foam, while Plateau's laws describe how the soap-films form structures in foams.\n\nSolid foams form an important class of lightweight cellular engineering materials. These foams can be classified into two types based on their pore structcture. The first type of foams are called open cell structured foams. These foams contain pores that are connected to each other and form an interconnected network. The second type of foams do not have interconnected pores and are called closed cell foams. Normally the closed cell foams have higher compressive strength due to their structures. A special class of closed cell foams is known as syntactic foam, which contains hollow particles embedded in a matrix material.\n\nThe closed cell structure foams have higher dimensional stability, low moisture absorption coefficient and higher strength compred to open cell structured foams. All types of foams are widely used as core material in sandwich structured composite materials.
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