What evidence of a chemical reaction might you see in the following cases? The time between contact and appearance of the stain could be days or months. 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. Remember that gases of elements such as oxygen are diatomic (O_2). Alkaseltzer in water-dissolving bubbly Bleaching stain- color change Burning match- color change smoke. Background. 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. Tooth whitening or tooth bleaching is the process of lightening the color of human teeth. These days many products are available to whiten teeth at home. 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. It has been used since 1907 as an oxidizer and bleaching agent, especially in … "what evidence of a chemical reaction might you see in bleaching a stain"? 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 … oxidation of other chemical moieties in the conjugated chain.25 Hydrogen peroxide oxidises a wide variety of organic and inorganic compounds. The Battling Stains with Bleach science activity guides students in a hands-on experiment using tap water, food coloring, and bleach. Evidence of a Chemical Reaction (Chem) How do you know a chemical reaction has occurred? New substances. There are only two main types of bleach to choose from when you are deciding which bleach to use on … Natural stains as well as some dyes produced from grass come from chemical compounds called chromophores. 1 Answer. Bleaching Effectiveness. stain removal solutions due to the spread of smears contributed by different stains in the fabrics. What is the evidence? 9,10 … NaOCl + H 2 O → HOCl + NaOH. Get the detailed answer: what evidence of a chemical reaction might you see in the following cases? 1 decade ago. 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. 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. Bleaching a stain 3. View the answer now. Why does oil and vinegar salad dressing have 2 separate layers. INTRODUCTION Stains are part of everyday life. What evidence of chemical reaction might you see in the following cases. This is an oxidizing agent, which causes a reaction to form another chemical compound. colour change? a. Favourite answer. 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. Most people know that forensics involves many different kinds of evidence, whether that is blood evidence or a weapon. 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? Plus, if your piece is blotchy or discolored, bleaching wood is a great way to prep it for a new stain. PLAY. Surfactants found in detergents may be used instead with a specific chemical makeup designed to avoid hard water reaction and subsequent soap scum. What evidence is there that the bleaching process is a chemical reaction? Solid formed when liquids are mixed in a chemical reaction. ... the stain and the rag create a chemical reaction that causes it to rot and decompose very quiclky. Hypochlorous acid is responsible for bleach's ability to remove colour from objects and for its ability to disinfect surfaces. When these two are combined, a chemical reaction happens, creating a bleach blanches the stain color and alters the color of the wood. 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. Stain removers fall into another category of chemical agents that can be used for even deeper cleaning. 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 Bleaching When Doing a DPD Test for Chlorine/Bromine. Oxalic acid removes rust stains and water, including teak stain, and can be used to lighten the graying effect of weather-exposed wood. The second type of stain or discoloration of carpets is the chemical stain. What evidence is there that such oven cleaners work by a chemical reaction? 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. A stain remover attacks a trouble spot by dissolving the blemish in a solvent. TAED can react with hydrogen peroxide to produce peracetic acid, an even stronger bleaching agent than hydrogen peroxide. Bleach also has a whitening and brightening effect on white clothing. b. dropping an Alka - seltzer tablet answer choices A sample of zinc is placed in water and settles to the bottom. 1. During oxidation, the oxidizing agent removes one or more electrons from its reaction partner. Precipitate produced. 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. There are many different reactions that happen during a wash cycle. Rusting of an iron nail I'm not sure if I got #1 right. However, the evidence can become degraded from a number of things such as time, heat or the use of bleach. A. 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. What evidence of a chemical reaction might you see in the following cases? Many of these products … during the bleaching process [1]. Chromophores can absorb light at specific wavelengths and therefore cause colors. 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. The chemical degradation of the chromogens within or on the tooth is termed as bleaching. What evidence of chemical reaction you might see in bleaching a stain was asked on May 31 2017. 2. 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. 0 0. You are correct that gases are formed for example #1 but I don't think that is the desired answer. The bleaching light is applied to the surface of the gel and the underlying gauze (Figure 14-39, D). bleaching Background A ... pastes, there is little clinical evidence as to their comparative effi-cacy. Tooth discoloration may be caused by intrinsic or extrinsic stains or a combination of both. Which of the following is an example that includes evidence of a chemical reaction? Here at Taylor, part of what I do is answer the technical calls and e-mails from homeowners, service techs, … Burning a match 4. ... NOT a chemical reaction... though many people confuse this... boiling, melting, freezing. Ordinary household bleach, sodium hypochlorite (NaClO), acts on a stain through the chemical process called oxidation reduction, or redox reaction. Bleach creates a chemical reaction with a stain that breaks it down and removes it from clothing. [] found differences between the groups only in the evaluation period following 4 weeks of dentifrice use. 3.1. STUDY. What evidence of a chemical reaction might you see when bleaching a stain? Source(s): my cat. zacmoo. 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. Answer Save. Relevance. 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 Bleaching is the physical and chemical interaction of an oil or fat with bleaching earth to improve its quality. 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. bleaching a match. I know it is a chemical reaction but what might I see? 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. 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