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What is the difference between brass and bronze?

Bronze was first discovered around 3500 B.C. As it is harder than iron and resists corrosion, people of the time began to use bronze to make weapons. This led people to name this time period the Bronze Age. Brass was not discovered for about 3000 more years. This is largely due to the fact that zinc is very difficult to find in its pure form on Earth. To produce the first brass, metallurgists smelted copper with calamine, which is a zinc ore. During the smelting process, the zinc would immediately precipitate from the ore and bond with the copper.\nIn modern times, copper is mixed with varying..

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What is the structural formula of butanone?

Butanone is also known as methyl ethyl ketone, part of a group of compounds called ketones. It comes in the form of a colorless liquid possessing a sharp yet sweet scent somewhere between that of butterscotch and acetone. The chemical is useful as a component in a wide variety of more complex mixtures, such as cleaning agents, paint removers or glues.\nButanone has a chemical makeup that is responsible for both its usefulness as a solvent and its volatility. Due to the oxygen atom found in the compound, it reacts with many oxidizing materials to the point that it can cause combustion just from..

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What is the formula for oxygen?

Oxygen is the third most abundant element in the universe and the most abundant element on Earth.\n\n The oceans are 86 percent oxygen by weight.\n The crust is 47 percent oxygen by weight.\n The atmosphere is 21 percent oxygen by volume.\n\n\n\nProperties of diatomic oxygen include:\n\n Reacts with diatomic hydrogen to form water\nReacts vigorously with Group 1 metals (alkaline metals) to oxidize them\nProduces ozone when exposed to sparks, such as lightning\nRequired for combustion and for metabolism of nutrients in animals\nHas three stable isotopes\n\n

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How long does it take for taste buds to grow back?

Some medical procedures that can also result in the loss of taste buds. These include radiotherapy, which has the potential to kill cancer cells as well as other normal cells in the body, including the taste bud cells. The taste buds on the tongue go through a two-week life cycle, which means that they are renewed every 10 to 14 days. If a person loses the ability to taste due to a loss of taste buds, the sense of taste should start returning within this two-week time frame.\nIf the loss of taste is due to another lesion, such as a cut in the nerve leading from the tongue to the brain, it migh..

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What are the limitations of the biological species concept?

The modern biological species concept was advanced by Ernst Mayr in 1942. Mayr defined a species as any group of organisms that currently or potentially reproduce with each other. This is best understood as any group of living things that could combine their genes if they are both healthy, sexually mature and in proximity to each other. This concept provides a useful tool for understanding most animal and many plant species.\nThe concept breaks down, however, for those organisms which don't need partners to reproduce. While two such organisms might be morphologically very similar, their i..

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What is the definition of "translational motion"?

Theoretically, translational motion of an object can occur along a curved path. In practical terms, however, translational motion more often occurs along straight lines. Since an object only changes its motion when a force acts upon it, and because force is defined as the product of mass and acceleration, it is more difficult to change the translational motion of a heavier object than a lighter one. The study of translational motion is known as translational dynamics.

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How do you calculate axial stress?

Axial force is applied in a direction parallel to the axis of the object, hence the name "axial." Axial stress may be either compressive stress or tensile stress. Compressive stress tends to make a body shorter, while tensile stress makes it longer. Axial stress is a cylinder stress pattern, meaning that it remains unchanged even if the object is rotated about its axis.\n\nAll cylinder stress patterns are an important concern when constructing anything that is cylindrical in shape. Engineers use different solutions to combat the effects of these stresses, but one of the most recognizable may b..

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What is the function of amoeba?

The amoeba is a single-celled organism called a protozoan that usually lives in water or inside other organisms as a parasite. This organism doesn't have a rigid shape, but it is made of a flexible material that changes shape as needed. An amoeba is made of protoplasm, a viscous, clear material with a cell membrane separating the ectoplasm and the endoplasm, or the outer and inner parts of the cell. The endoplasm contains the nucleus of the cell.\nWhile most amoebas are too small to see with the naked eye, some of the common and giant species grow large enough to see without the aid of a ..

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What are the normal components of lymph?

The lymph system carries fluid, nutrients and waste throughout the body's tissues and into the bloodstream. Lymph nodes, small, bean-shaped organs, produce immune cells that help the body fight infection, according to the National Institutes of Health. These cells are located in the neck, groin and underarm regions and generally cannot be felt under the skin. The lymph nodes filter the lymph fluid, trapping bacteria, viruses and other foreign particles inside. The immune cells, known as lymphocytes, then destroy the harmful particles.\nDuring times of injury or infection, the lymph nodes ..

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How do micro wind turbines that are for sale benefit homeowners?

Micro wind turbines are a form of alternative energy that use the wind to generate electricity. Large-scale wind turbines have been used for many years, but smaller systems available for homeowners and businesses are starting to become more popular. Given the right conditions, these turbines could provide homeowners with a clean source of energy that will cut electricity costs. The turbines do not emit gases or use water, so they are much more sustainable than the classic ways of producing electricity. Wind generation is only possible in areas that have at least an average wind speed of 9.8 mi..

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