#### • Class 11 Physics Demo

Explore Related Concepts

#### • advantage and disadvantage of internal

An oxidation reaction is always involved with reduction reaction. The combination of oxidation and reduction reactions is commonly called as redox reaction. Let’s first discuss what are oxidation and reduction reactions? An oxidation reaction can be defined as addition of oxygen or removal of electrons while in a reduction process, the species involves in the addition of hydrogen or removal of oxygen or addition of electrons. In a redox process both oxidation and reduction process occurs simultaneously.

In other words; one species donates electrons while another accept it.  Oxidation process can be observed in our surrounding also which may or may not good for us. In any of the oxidation process the oxidation number of specie increases due to lose of electrons. Let’s discuss some oxidation reactions which are found in many surroundings such as plants, animals, metals, foods and machines with their advantages and disadvantages.

Photosynthesis is one of the most common process which involves both oxidation and reduction steps. It involves the reaction of CO2 with H2O and leads to the formation of organic molecules such as C6H12O6 with O2 gas. Here water is oxidised while CO2 gets reduced to form glucose molecule.  Hence it is one of the useful redox or oxidation-reduction process which results the formation of food for all the living organisms. Combustion is another advantage of oxidation which occurs with the liberation of large amount of energy in the form of heat.

For example combustion of coal forms CO2 by the oxidation of carbon and also forms water vapour. The oxidation of metal surfaces is a slow oxidation process which converts the metal into metal oxidise which is commonly called as rust. The formation of rust deteriorates the metal surface and one of the major disadvantages of oxidation of active metal surfaces. For example the rusting over iron surface is due to the formation of Fe2O3 which is reddish-brown in colour. Similarly the oxidation of copper metal surface results the formation of greenish coating of copper oxide. Another example of oxidation-reduction process is batteries which can flow the electricity in the electrical circuit due to oxidation and reduction reactions over electrodes. The fuel of the space shuttle is also making use of Oxidation-reduction reactions.

Rancidity or spoiling of food is also occurred due to oxidation reaction fatty acids or oils found in the food. The oxidation of food can be prevented with the use of anti-oxidant and other food preservatives. The aging in human beings is also due to the oxidation process in which oxidants extract electrons from the cell membranes and causes a gradual cleavage of immune system of human body. The presence of natural or artificial antioxidants like vitamin C and E can prevent this oxidation.

The oxidation can also observe in fruits and vegetables such as cut surface of fruits and vegetables turns brown due to oxidation process. The cover or skin of fruit prevents this oxidation but as we cut it, the inner part comes in contact with air and oxidised. Natural antioxidants like vitamin C can be used to prevent this oxidation such as if we apply lemon juice on the cut surface of an apple, it prevents the apple surface to turn brown.

#### Best Results From Yahoo Answers

Question:hmm i really dont know how to answer this question.. any ideas??

Answers:Advantages: * Less total energy used to obtain metals * Less release of S0x (Ores of heavy metals are commonly Sulphides) * Less release of CO2 (Oxide ores are commonly reduced with carbon) Disadvantages: * Transportation of recycled metals from diffuse sources is complex & expensive * Skilled labor is required to separate recyclable metals properly

Question:

Answers:The advantages of water chlorination: 1. Controls Disease-Causing Bacteria: Disease-causing bacteria may enter the well during construction, repair, flooding or as a result of improper construction. Proper chlorination will kill these bacteria. 2. Controls Nuisance Organisms: Chlorine treatment will control nuisance organisms such as iron, slime and sulfate-reducing bacteria. Iron bacteria feed on the iron in the water. 3. Mineral Removal: Large amounts of iron can be removed from water by adding chlorine to oxidize the clear soluble iron into the filterable reddish insoluble form. Chlorine helps remove manganese and hydrogen sulfide in the same way. The disadvantages of water chlorination: 1. No Nitrate Removal: Chlorine will not remove nitrates from water. The claims of some water treatment firms imply that nitrates can be removed by chlorination. This is not true. Adding chlorine may prevent nitrates from being reduced to the toxic nitrite form; however, nitrates are not removed from water by chlorination. 2. Causes Smell and Bad Taste: Chlorine in water is not poisonous to humans or animals. However, if the concentration is great enough the water will taste bad so consumption may be reduced. Some people object to the smell and/or taste of very small amounts of chlorine. In those cases an activated carbon or charcoal filter may be used to remove the chlorine from the drinking water. 3. Trihalomethanes (THMs) are organic chemicals that may form when chlorine is used to treat water supplies that contain humic compounds. Humic compounds form as a part of the decomposition of organic materials such as leaves, grass, wood or animal wastes. Because THMs are very seldom associated with groundwater, they are primarily a concern where surface water supplies are used. Lifetime consumption of water supplies with THMs at a level greater than 0.10 milligrams per liter is considered by the Environmental Protection Agency to be a potential cause of cancer. THMs can be removed from drinking water through use of an activated carbon filter.

Question:I am doing preparation for my French speaking exam by answering questions and have become unstuck on the above. Please help!!

Answers:Means of Transport for Adventure Travel There are many different means of transport to get around. Nevertheless, most people take the plane to reach their destinations. And when they set out for longer journeys, they also take the airplane to move between destinations, even if they are not far apart. According to us, taking the airplane is not the most adventurous way of travelling. It will only bring you to big cities or the most popular places, skipping the interesting countryside. And it will not bring you in contact with the locals, who are not using airplanes to get around. And what about those of us who are afraid of flying? And what about the air travel s contribution to global warming? So, lets find out about some alternative means of transport for adventure travel. Do you travel with the locals? For us, adventure travel includes finding your way around by public transport. This is what is often meant by independent travel (or individual travel) as well. A drawback may be that it takes some more time to get around, but on the other hand it is a great way to meet local people, and that s also what travelling is about, isn t it? In general, two types of public transport systems can be identified: the systems that take you from destination to destination, and local systems that help you get around. Should you use the train or the bus? To travel from one destination to another, we prefer to travel by train. Trains are comfortable, without sudden movements, and mostly you can move around in them. More information can be found on our page about Train Travel. In some continents or countries, however, there are little or no rail tracks. To move between destinations there, you will have to take the bus. But buses have their advantages, too. For one, they are often cheaper than trains. So check our page about Bus Travel to know when and where you can take the bus. How do you get around? To get around within a city or region, you need to depend on local transport. However, in every continent, every country, and even in every city, the local public transport system can be different. When travelling to the big cities in for instance Europe, be prepared to learn the specific details of the local subway or bus system again for each city. These are the general guidelines for this: find a public transport map; find out the payment type and discount cards; and get going. In some continents and countries, however, you need to learn the general way of local transport. Read about a few of those on our Rickshaw page. What is meant by Overlanding? Apart from using public transport, there are other means of travelling overland. Bringing your own vehicle is also an option. In urban areas and developed country, this may have some of the disadvantages as air travel: you will only see your destination plus the highway, and you will not meet the locals. In more remote areas, however, you will indeed see much more, and may end up sleeping at the locals in distant villages in the countryside. In these remote regions, you will most likely need a 4x4 vehicle or motorbike, allowing you to go offroad. You can read more about this in this article about Offroad Adventure Travel, written for us by offroad specialist Ron Douglas. If you are adventurous, but not technical enough to go by your own 4x4, consider taking an overland truck. These are organized trips, but other than that, they offer all the excitement of adventure travel. Read more about this way of travelling on out page about Overland Trucks. And check out how to travel Africa Overland. Last, but certainly not least, we would like to mention travelling by bicycle. Agreed, it is slow, but if you have more time on your hands, it is the best way to experience the country and region you are travelling in. You can read more about it in this article about Bike Travel, written for us by experienced bicycle traveller Peter van der Lans. Advantages and Disadvantages The biggest advantage of NGVs is that they reduce environmentally harmful emissions. natural-gas vehicles can achieve up to a 93 percent reduction in carbon monoxide emissions, 33 percent reduction in emissions of various oxides of nitrogen and a 50 percent reduction in reactive hydrocarbons when compared to gasoline vehicles. NGVs also rate higher in particulate matter 10 (PM10) emissions. PM10 particles transport and deposit toxic materials through the air. NGVs that operate in diesel applications can reduce PM10 emissions by a factor of 10. Natural-gas vehicles also offer these benefits: Build vs. Buy NGVs can be built from scratch to include the design enhancements described above. A brand-new natural-gas vehicle costs $4,000 to$8,000 more than a comparable gasoline vehicle. It's also possible to modify conventional gasoline vehicles to run on natural gas. This, too, can be expensive, with the modifications typically costing $3,000 to$5,000. Veh

Question:what are the benefits of using solar power as an alternative energy source and also the disadvantages. This is for a school assignment and i need the answers fairly soon. If you could tell me how solar power works and if u dont know could u give me any websites for them Thanks heaps