a. Many of these products … PLAY. What evidence of chemical reaction you might see in bleaching a stain was asked on May 31 2017. [] found differences between the groups only in the evaluation period following 4 weeks of dentifrice use. TAED can react with hydrogen peroxide to produce peracetic acid, an even stronger bleaching agent than hydrogen peroxide. Bleaching a stain 3. Detergents at a minimum provide: Builders that tie up water hardness ions (calcium, magnesium, etc) so they can be rinsed away without inhibiting detergency or depositing onto the clothes. colour change? "what evidence of a chemical reaction might you see in bleaching a stain"? Ordinary household bleach, sodium hypochlorite (NaClO), acts on a stain through the chemical process called oxidation reduction, or redox reaction. What evidence of a chemical reaction might you see in the following cases? Remember that some stains do not react to use of a bleach, so if two applications of a bleach are ineffective, move on to another bleach. Dropping an Alka-Seltzer^TM tablet into a glass of water b. Bleaching a stain c. Burning a match d. Rusting of an iron nail Balance the following equations: a. Mg(s) + HCl(aq) rightarrow H_2(g) + MgCI_2(aq) b. A. View the answer now. Here at Taylor, part of what I do is answer the technical calls and e-mails from homeowners, service techs, … I answer, It reacts to produce bubbles of carbon dioxide and soluble salts.What evidence of a chemical reaction might you see in the following cases? What evidence is there that such oven cleaners work by a chemical reaction? Surfactants found in detergents may be used instead with a specific chemical makeup designed to avoid hard water reaction and subsequent soap scum. There are only two main types of bleach to choose from when you are deciding which bleach to use on … What evidence of chemical reaction might you see in the following cases. Bleaching When Doing a DPD Test for Chlorine/Bromine. Most people know that forensics involves many different kinds of evidence, whether that is blood evidence or a weapon. TAED is not a catalyst, an additive that speeds up a chemical reaction, during the oxidation reaction because TAED is consumed during the oxidation process; catalysts are never used up INTRODUCTION Stains are part of everyday life. zacmoo. Get the detailed answer: what evidence of a chemical reaction might you see in the following cases? It has been used since 1907 as an oxidizer and bleaching agent, especially in … What evidence of a chemical reaction might you see in the following cases? Answer Save. There are many different reactions that happen during a wash cycle. What is the evidence? The chemical degradation of the chromogens within or on the tooth is termed as bleaching. American Chemical Society Page 1 -----BLEACHING WITH GREEN OXIDATION CHEMISTRY By Kathryn E. Parent, k_parent@acs.org Introduction Whether you’re washing the dirt off your face, cleaning grease from your hands or removing the stain on your shirt, chemistry is at work, helping you to remove unwanted dirt, grease and stain molecules. Whitening is often desirable when teeth become yellowed over time for a number of reasons, and can be achieved by changing the intrinsic or extrinsic color of the tooth enamel. Although these days many people have “self-cleaning” ovens, if your oven gets really dirty you may have to resort to one of the spray-on oven cleaner preparations sold in supermarkets. Chromophores can absorb light at specific wavelengths and therefore cause colors. Favourite answer. Source(s): my cat. Tooth whitening or tooth bleaching is the process of lightening the color of human teeth. During oxidation, the oxidizing agent removes one or more electrons from its reaction partner. Extrinsic stain removal from teeth by toothpaste could be achieved by physical means through abrasives or chemical means through organic solvents, notably detergents. Dropping an Alka-Seltzer^TM tablet into a glass of water b. Bleaching a stain c. Burning a match d. Rusting of an iron nail Balance the following equations: Write an equation for the following reactions. Stain removers fall into another category of chemical agents that can be used for even deeper cleaning. However, the evidence can become degraded from a number of things such as time, heat or the use of bleach. When these two are combined, a chemical reaction happens, creating a bleach blanches the stain color and alters the color of the wood. Evidence of a Chemical Reaction (Chem) How do you know a chemical reaction has occurred? ... NOT a chemical reaction... though many people confuse this... boiling, melting, freezing. New substances. ... the stain and the rag create a chemical reaction that causes it to rot and decompose very quiclky. The reaction between NaOCl and water produces produces HOCl, or hypochlorous acid, and sodium hydroxide, or caustic soda, as shown in the following chemical equation. accelerate the bleaching reaction by activating the bleaching agent. In the four studies that evaluated tooth color change using the VITA shade guide, all studies [20, 22–24] reported that bleaching dentifrices were effective for tooth whitening when compared with regular dentifrices ().However, Gerlach et al. Plus, if your piece is blotchy or discolored, bleaching wood is a great way to prep it for a new stain. 1. Remember that gases of elements such as oxygen are diatomic (O_2). bleaching a match. NaOCl + H 2 O → HOCl + NaOH. Although the bleaching gel with the gauze should whiten the teeth effectively, some dentists, and in particular some patients, prefer to have the light-activated protocol used in addition to the chemical reaction of the bleach. Hypochlorous acid is responsible for bleach's ability to remove colour from objects and for its ability to disinfect surfaces. Burning a match 4. answer choices A sample of zinc is placed in water and settles to the bottom. When bleach reacts with a stain molecule, the chemical structure of the stain molecule's chromophore changes—and the visible stain disappears. Sodium perborate in the form of monohydrate, trihydrate, or tetrahydrate is used as a hydrogen peroxide–releasing agent. Solid formed when liquids are mixed in a chemical reaction. Alkaseltzer in water-dissolving bubbly Bleaching stain- color change Burning match- color change smoke. What evidence is there that the bleaching process is a chemical reaction? 3.1. Background. One definition of quality is “to reach a level of excellence.” However, with respect to oil specifications, it is quite variable and depends on the product and market we are dealing with. What evidence of a chemical reaction might you see when bleaching a stain? bleaching, into four categories: mild, moderate, severe, and intracta-ble.14,15 “Mild” degree can be observed as a yellow/gray stain uniformly FBT expands the bleaching from a conventional process of shade lightening to a systematic balancing of color between the stained and the normal tooth regions. bleaching Background A ... pastes, there is little clinical evidence as to their comparative effi-cacy. There are more than 100 tough stains and effectivity of stain removals depends on the kind of stain and the chemical reaction once it gets in contact with the stain … Which of the following is an example that includes evidence of a chemical reaction? 9,10 … The mechanisms of these reactions are varied and dependent on the substrate, the reaction environment, and catalysis.26 In general, the mechanism of bleaching by hydrogen peroxide is not well You are correct that gases are formed for example #1 but I don't think that is the desired answer. 1 Answer. Relevance. These days many products are available to whiten teeth at home. Rusting of an iron nail I'm not sure if I got #1 right. oxidation of other chemical moieties in the conjugated chain.25 Hydrogen peroxide oxidises a wide variety of organic and inorganic compounds. Oxalic acid removes rust stains and water, including teak stain, and can be used to lighten the graying effect of weather-exposed wood. b. dropping an Alka - seltzer tablet The Battling Stains with Bleach science activity guides students in a hands-on experiment using tap water, food coloring, and bleach. a. I know it is a chemical reaction but what might I see? Natural stains as well as some dyes produced from grass come from chemical compounds called chromophores. This is an oxidizing agent, which causes a reaction to form another chemical compound. There are 2 major approaches to removing the stains, including the chemical mechanism using peroxides for tooth bleaching and the mechanical mechanism using abrasives in prophylactic pastes and dentifrices to remove stains, resulting in a whitening effect. Bleaching is the physical and chemical interaction of an oil or fat with bleaching earth to improve its quality. Lastly A/B bleach can be tried, but since removal or acceptable lightening of the stain results in bleaching of the surrounding wood, this is a last resort. The second type of stain or discoloration of carpets is the chemical stain. during the bleaching process [1]. The time between contact and appearance of the stain could be days or months. 1 decade ago. Bleaching Effectiveness. The bleaching light is applied to the surface of the gel and the underlying gauze (Figure 14-39, D). Why does oil and vinegar salad dressing have 2 separate layers. Bleach creates a chemical reaction with a stain that breaks it down and removes it from clothing. 0 0. Tooth discoloration may be caused by intrinsic or extrinsic stains or a combination of both. Precipitate produced. More insidious than the common stain, the chemical stain is caused by the introduction of foreign substances to the surface pile, which actually changes or destroys the dye. 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