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Whether a “Do Not Enter”sign is posted on a property, in a building or a street sign, it is always wise to listen to what the sign is telling you. Failure to do so can put you and others in danger and could even pose a death threat. Just remember that the sign is there for a reason. It is to keep you away from danger. Even if the area doesn't look risky but there is a “Do Not Enter” sign, do just as it says and stay away.

One definition, an oxidizing agent receives - or accepts - electrons from a reagent. In this context, the oxidizing agent is called an electron acceptor. A classic oxidizing agent is the ferrocenium ion [Fe(C5H5)2]+ which accepts an electron to form Fe(C5H5)2. Of great interest to chemists are the details of the electron transfer event, which can be described as inner sphere or outer sphere.

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The purpose of “Do Not Enter” signs is to keep people safe from potential hazards. If you see such a sign, you should always obey it. Failure to do so can leave you with disastrous consequences. Without “Do Not Enter” signs, preventable accidents will happen and could even mean a lawsuit for you if it happens in your facility or on your property. If you are overseeing a dangerous area that only certain people should have access to, then it's your responsibility to post “Do Not Enter” signs to warn the general public to stay out. You'll see these signs in a variety of settings, such as facilities, danger zones and while you're driving.

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The strict dangerous goods definition of an oxidizing agent are substances that, while in themselves not necessarily combustible, may, generally by yielding oxygen, cause, or contribute to, the combustion of other material. (Australian Dangerous Goods Code 6th Edition) By this definition some materials that are classified as oxidizing agents by analytical chemists are not classified as oxidizing agents in a dangerous goods sense. An example is potassium dichromate which does not pass the dangerous goods test of an oxidizing agent.

A common place to see “Do Not Enter” signs is on the roadway when you are driving. This sign is so important that in many jurisdictions, you're required to obey this sign to pass your driver's test. Failure to do so means an automatic failure. When you see this regulatory street sign it means that you're about to face opposing traffic and that you'll be going the wrong way. Failure to obey these signs could have disastrous consequences if not death. If you're entering a highway going the wrong way, you're at a high risk of having a head-on crash which can be deadly, especially since the traffic coming at you will be coming at a high rate of speed. You are likely to encounter these road signs at on-ramps to highways and one-way streets. It is especially important to pay close attention to these street signs when you see them to avoid disrupting the flow of traffic or even worse, a traffic collision.

Dangerous areas require the use of “Do Not Enter” signs. Without them, unsuspecting people may wander into an area and put themselves in great danger. One example of such an area would be a construction zone. If the area isn't blocked off, it may be difficult for someone to know that the area is dangerous. Maybe it doesn't look threatening so it can be tempting to walk around the area and see what's going on. It's especially tempting for kids because it can look like a lot of fun. Kids want to look at all the heavy equipment, play on the dirt pile and jump off the foundation. But, what most people don't realize is that construction zones have a lot of hidden dangers. For construction areas and other similar areas, it is necessary to use “Do Not Enter” signs. Even though it is impossible to physically monitor a site continually, you can warn people to stay away by posting a sign. If it is your property, then it's your responsibility to post the sign to warn others of the danger and attempt to keep everyone safe.

Do Not Enter SignAuthorized Personnel Only

In the above equation, the Iron (Fe) has an oxidation number of 0 before and 3+ after the reaction. For oxygen (O) the oxidation number began as 0 and decreased to 2−. These changes can be viewed as two "half-reactions" that occur concurrently:

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Because the process of oxidation is so widespread (explosives, chemical synthesis, corrosion), the term oxidizing agent has acquired multiple meanings.

Iron III (Fe) has been oxidized because the oxidation number increased and is the reducing agent because it gave electrons to the oxygen (O). Oxygen (O) has been reduced because the oxidation number has decreased and is the oxidizing agent because it took electrons from iron (Fe)

If you see a “Do Not Enter” sign in any facility, you should obey the sign. It is there for a good reason. Failing to obey the sign can put you or others in danger. If you're in a facility, such as a hospital, you are likely to see these signs posted in restricted areas. Only authorized personnel are allowed to enter such areas. These areas may be restricted because they are dangerous or hazardous. The laboratory in a hospital is restricted because it contains harmful chemicals and biological hazards. If there were no signs to tell you to stay out of that area, you might walk right into the laboratory where you'd be exposed to chemical or unknown diseases. Other areas, such as offices, might be restricted because they contain sensitive and confidential data. Although there is no direct danger involved, it is still necessary to post a “Do Not Enter” sign so that you can keep the area secure.

The former definition is not applicable to what most people read about, but it is the sense in which most organic chemists use the term. In both cases, the oxidizing agent becomes reduced in the process.

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A mnemonic for differentiating the reactions is "OIL RIG": Oxidation Is Loss, Reduction Is Gain (of electrons) or "LEO the lion says GER" (Lose Electrons: Oxidation, Gain Electrons: Reduction)

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In another more colloquial usage, an oxidizing agent transfers oxygen atoms to the substrate. In this context, the oxidizing agent can be called an oxygenation reagent or oxygen-atom transfer agent. Examples include [MnO4]− permanganate, [CrO4]2− chromate, OsO4 osmium tetroxide, and especially ClO4 perchlorate. Notice that these species are all oxides, and in fact, polyoxides. In some cases, these oxides can also serve as electron acceptors, as illustrated by the conversion of [MnO4]− to [MnO4]2−, manganate.

“Do Not Enter” signs are used for a variety of situations. Regulatory signs are red and white and are extremely important as they are road signs that warn you that traffic will be coming at you if you enter. You may also notice these signs at facilities that contain a restricted area. Dangerous zones will also contain these signs and these are often located on open property that one could easily enter if such signs were not posted. This could mean someone unknowingly entered a dangerous area. If you see a “Do Not Enter” sign, whether it be street signs or for a restricted area, such as a construction zone or inside a facility, then it is best to obey the sign to ensure your safety. Specific reasons to use these signs include the following: