Explain about redox reaction in fuel combustion, bleaching of hair, and corrosion of iron.?
All redox reactions involve two simultaneous processes: oxidation and reduction. Oxidation and reduction involve the exchange of electrons. Redox reactions will always be accompanied by changes in the oxidation numbers of two elements. When a hydrocarbon burns in oxygen, the carbon atoms in the hydrocarbon are oxidized to form carbon in the +4 oxidation state in CO2 and oxygen gas (O2) is reduced to the oxide radical in CO2 and H2O, where oxygen has an oxidation number of -2. Iron rusts in the presence of oxygen and water to form FeO(OH). Iron is oxidized to the +3 oxidation state and oxygen is reduced to the -2 oxidation state. 4Fe(s) + 3O2(g) + 2H2O(l) --> 4FeO(OH)(s) There are three forms of rust. Fe(OH)3 occurs under water, FeO(OH) is the most common form of rust, and what we see most often. Fe2O3 occurs as rust is dehydrated.
What type of reaction would you suspect that bleach is doing to the colored organic compounds that cause stain?
Household bleach is sodium hypochlorite Na(+1) OCl(-1). There are other common ones such as hydrogen peroxide (H2O2). They are oxidizing agents, that is they remove electrons from the substance that causes the stain. In many cases, but not all, the oxidized form of the stain is colorless, or at least less highly colored than the reduced form, so the stain disappears. There are many mechanisms by which a substance is colored. All that is required is that the substance absorb some wavelength of visible light (wavelength between about 400-700 nm). How effective one bleaching agent (oxidizing agent) is over another is difficult to predict. One example is a blood stain. Household bleach will bleach a blood stain, but not so effectively, while hydrogen peroxide bleaches the blood stain instantaneously. So the general mechanism of a bleach is a chemical reaction in which the reactants are colored but the products are not.
How does bleaching is actualyl a redox reaction? what is oxidized and reduced? oxidizing and reducing agent?
First, you may desire to comprehend what a redox reaction is; it quite is a reaction wherein the climate substitute fee. For H3O+--->H2O, hydrogen and oxygen to do no longer substitute fee with the aid of fact on the two sides of the reaction hydrogen has a a million+ fee and oxygen has a 2- fee. So H30+ isn't decreased or oxidized. MnO2 is an oxidizing agent with the aid of fact the fee on the Mn modifications from 4+ to 2+. An oxidizing agent is the factor that has it particularly is fee decreased. Cl- is a reducing agent with the aid of fact the fee on Cl is going from a million- to 0. A reducing agent is the factor that loses electrons, or gets an more desirable fee.
What is the reaction form of bleaching powder and water?
Bleaching powder is Ca(ClO)2 known as calcium hypochlorite. The commercial powder form is a mixture of Ca(OH)2, CaCl2 and Ca(ClO)2. In water the powder hydrolyses to hypochlorous acid, HOCl, which hydrolyses to HCl and reacts further to produce chlorine, the active chemical of bleaching powder, thus:HOCl + HCl = H2O + Cl2The bleaching mechanism depends on the pH of the solution of the powder in water.In strongly acidic solution, HOCl is formed which produces HCl and chloric acid, HClO3:3HOCl = HClO3 + 2HClThe reason for the mixture of above chemicals in bleaching powder is that it maximises available chlorine for bleaching or disinfections. All of the Ca+ ions end up associated with Cl- ions as the chloride.
Why are all combustion reactions redox reactions?
Hello! You almost answered your own question, and you're on the right track. I don't know if your class has talked about oxidation numbers yet, but that's how you track what is being oxidized and what is being reduced. (Just Google "How to assign oxidation numbers") So, once you know about assigning oxidation numbers you can see what is being oxidized and reduced when you apply the principles you said in the first part of your question: When something is oxidized, it's oxidation number increases. When something is reduced, it's oxidation number decreases. Now apply that to your redox reaction: The combustion of propane. C3H8 + 5O2 ------> 3CO2 + 4H2O On the left, in propane, the oxidation number of carbon is -8/3 and the oxidation number of oxygen is 0. On the right, the oxidation number of carbon is +4 and the oxidation number of oxygen is -2. So, the oxidation number of carbon increased (it was oxidized) and the oxidation number of oxygen decreased (it was reduced) I'm sorry if that was a bit too complication for your class, but I hope it helped. Good luck!
What is the redox reaction between hydrogen sulphide and chlorine?
H2S(gas)+ Cl2(gas) have a redox reaction,S (sulfur) drops out ( solid) and 2HCl (g) is formed.Cl2 is the oxidiser and get it self reduced to HCl.thus H2S is the reducing agent, the sulfur gets oxidized to S.Like a little video as dessert?
How stain are useful to determine oxidation reduction reaction?
Some stains are used as ‘Redox indicators’-an oxidation-reduction indicator. These are indicators which undergo specific colour change when subjected to an electrode potential. Egs include,Safranine and Methylene blue.Methylene blue solution turns colourless when exposed to a reducing agent/environment (Stays blue in oxidizing environment.)Safranine is reddish-pink in oxidizing environment,and turns colourless when exposed to areducing environment/agent.
How do you get a bleach stain out of a carpet?
Here is my answer:For the most part, as indicated in other answers given, bleach removes colors and weakens the fabrics rather than stains them. There are, however, some specific fabrics that the bleach will actually stain. I assume those fabrics are the basis of the question, and my answer is below:Special notesBe sure to test on a hidden area to ensure carpet is colour-fast. Do not proceed until you are certain not to cause further damage.If in doubt, don't! Call Reliable Carpet & Upholstery Care or a reputable carpet professional in your area.Chemical solvents and suppliesDetergentWhite vinegarNOTICEThese solutions contain chemicals that may permanently alter the colour of your carpet. You should follow the procedures below to make sure that all of the chemical is removed from your carpet to prevent further damage.Scoop up and blot as much of the spill as possible. .Mix 1/4 teaspoon mild liquid dish soap with one cup warm water.Apply the cleaning solution to the stain area. Work from the outside of the stain toward the center.Allow the cleaning solution to remain on the spill for at least five minutes.Blot with a clean white cloth until no more stain transfers to the cloth. Do not rub the stain area or you might damage the carpet fibers.Rinse with cold water. Be sure all cleaning solution is removed from carpet.If you can still see the stain, repeat the process until either the stain is removed or the stain no longer transfers to the cloth.If the stain remains, mix 2 tablespoons white vinegar with 4 cups warm water and follow the same protocol above. If the stain persists after trying each solution listed, contact Reliable Carpet & Upholstery Care or a reputable professional in your area for advice.Once the stain is removed, place layers of white paper towel on the site to absorb any moisture. Weigh down the towels with a non-staining glass or ceramic object. You can let them sit overnight.When the carpet is dry, vacuum to restore the texture.
Does bleaching your hair with peroxide damage it?
Yep. Bleaching your hair with any bleaching agent damages it. What you're doing is opening up the hair's cuticle and destroying the melanin inside using a redox reaction (which can happen with other chemicals as well, not just hydrogen peroxide). This dries out the hair and weakens it, removing some of its proteins that provide strength. Your hair will be more susceptible to heat damage. It'll be dry and frizzy. It may even break off if damaged too much.However, there are some new additives out which claim to mitigate this damage so that it is negligible and allows for more frequent bleaching. One is called Olaplex. I'll be trying it soon to see how it goes.
Can bleaching hair damage it?
Oh yes. Very much so.Bleaching always damages hair, it's really a matter of how much. Bleach is mostly hydrogen peroxide. Free hydrogen peroxide will damage any tissue it encounters via oxidative stress. It basically melts skin and hair if you leave it on long enough.Hydrogen peroxide works to bleach hair through a redox reaction. This removes the pigment in the hair shaft. The trick is to leave the bleach on just long enough to remove the pigment without melting the hair or burning the scalp. All methods of hair lightening work via a redox reaction, so they all have the ability to damage hair and skin if not carried out properly.