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Meghna Thapar 5 years, 6 months ago
Anaerobic respiration is a type of respiration where oxygen is not used; instead, organic or inorganic molecules are used as final electron acceptors. Fermentation includes processes that use an organic molecule to regenerate NAD+ from NADH. Even though fermentation happens without oxygen, it isn't the same as anaerobic respiration. ... If that acceptor is oxygen, the process is considered aerobic respiration. However, some types of organisms, including many types of bacteria and other microorganisms, can use different final electron acceptors.
Posted by Mahi..... ♾ 5 years, 6 months ago
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Meghna Thapar 5 years, 6 months ago
Sun is considered as ultimate source of energy as sun gives the heat to the dumped trees and animals due to this long term heat the dumped trees and animals converted in to fossil fuels. Solar power is pollution free and causes no greenhouse gases to be emitted after installation. Reduced dependence on foreign oil and fossil fuels. Renewable clean power that is available every day of the year, even cloudy days produce some power.
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Double Displacement Reaction: Reactions in which ions are exchanged between two reactants forming new compounds are called double displacement reactions.
Example: When the solution of barium chloride reacts with the solution of sodium sulphate, white precipitate of barium sulphate is formed along with sodium chloride.
<i>BaCl2 + Na2SO4 → BaSO4 + 2NaCl</i>
Posted by Umang Pahuja 5 years, 6 months ago
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Meghna Thapar 5 years, 6 months ago
Oxidation and Reduction Reaction:
In this reaction, CuO is changing into Cu. That is, oxygen is being removed from copper oxide. Removal of oxygen from a compound is called reduction, so we can say that copper oxide is being reduced to copper. On the other hand H2 is changing into H2O. That is, oxygen is being added to hydrogen. The addition of oxygen to a substance is called oxidation, so we can say that oxygen is being oxidised to water.
The chemical reaction in which the oxidation and reduction takes place simultaneously is called redox reaction.
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The four-chambered heart has a distinct advantage over simpler structures: It allows us to send our "dirty" blood to the cleaners-the lungs-and our "clean" blood to the rest of the body without having to mix the two. That system is very efficient. In four chambered heart, left half is completely separated from right half by septa. It serves following two purposes (a) ensures complete segregation of oxygenated and deoxygenated blood (i.e., no mixing). (b) allows a highly efficient supply of oxygenated blood to all parts of the body.a
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Meghna Thapar 5 years, 6 months ago
Aluminum reacts with sodium hydroxide to form a salt called sodium aluminate(NaAlO2) and hydrogen gas. We usually think that when a metal reacts with an acid,it forms salt and hydrogen gas. This case aluminium acts as a amphoteric metal which basically means that it has both acidic and basic properties.
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Six single bonds between Carbons and Hydrogens, three single bonds between six Carbons and Hydrogens ( alternatively) . Three double bonds present between carbons ( alternatively in hexagonal ring). So a total of nine single bonds, three double bonds are present in benzene ring.
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The small intestine is where most chemical digestion occurs. After the stomach empties the food and juice mixture into the small intestine, the juices of two other digestive organs mix with the food to continue the process of digestion. One of these organs is the pancreas. It produces a juice that contains a wide array of enzymes to break down the carbohydrate, fat, and protein in food. Other enzymes that are active in the process come from glands in the wall of the intestine or even a part of that wall.
The liver produces yet another digestive juice—bile. The bile is stored between meals in the gallbladder. At mealtime, it is squeezed out of the gallbladder into the bile ducts to reach the intestine and mix with the fat in our food. The bile acids dissolve the fat into the watery contents of the intestine, much like detergents that dissolve grease from a frying pan. After the fat is dissolved, it is digested by enzymes from the pancreas and the lining of the intestine.Digested food broken down in the small intestine is the size of molecules and can now pass through the villi into the blood stream through the process of diffusion.
Digested molecules of food, as well as water and minerals from the diet, are absorbed from the cavity of the upper small intestine. Most absorbed materials cross the mucosa into the blood and are carried off in the bloodstream to other parts of the body for storage or further chemical change. As already noted, this part of the process varies with different types of nutrients. Finally, all of the digested nutrients are absorbed through the intestinal walls. The waste products of this process include undigested parts of the food, known as fiber, and older cells that have been shed from the mucosa.
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Meghna Thapar 5 years, 6 months ago
The tendency of metals to lose electrons inorder to get stability is called electropositive nature of metals. In general most of the metals lose electrons from their valence shell due to weak force of attraction on the outermost shell. Metals like Na, Mg,Fe, Zn lose electrons and form positively charged ion. Due to this metals are called electropositive elements. Metals are called electro positive elements because metals have a higher tendency to loose electrons. when an element loose electron it gains positive charge.
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