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What are five indicators of a chemical change?

Gas bubbles can form when a chemical solution is boiled or warmed. When two soluble reactants are mixed together in a solution, a precipitate form can occur. A chemical compound has its own color absorption spectrum. However, a color change does not mean a chemical reaction occurred. For example, although zinc oxide changes color from white to yellow, but there is no chemical change. Energy is required for breaking chemical bonds. When chemical bonds are formed, energy is released. If more breaking than forming of bonds happen, energy is absorbed, making the solution cooler. The surroundings b..

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What were some of the effects of the Mt. Vesuvius eruptions?

Mt. Vesuvius experienced several other major volcanic eruptions between 1631 and 1944. Two occurred during the 20th century. The first was in 1906 and caused mass destruction in the city of Naples and the deaths of more than 100 people. This resulted in the shifting of the 1908 Olympic Games from Italy to London, England so that the Italian government could reallocate financial resources to the rebuilding of Naples. The 1944 eruption destroyed nearby villages and an estimated 78 to 88 American aircraft at a World War II airfield.In anticipation of a new eruption, the Italian government has for..

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What are some uses of semiconductors?

Semiconductors are naturally found in nature. Elements like germanium and silicon are considered semiconductors. Compounds like cadmium selenide or arsenide are also semiconductors. Making minor changes to these elements or compounds can greatly change their ability to transmit conductivity.Semiconductors are essential to the operations of electronics like microwave ovens, radios, watches and telephones. This is because when semiconductors are manufactured, it's easy to control the amount of electricity that they transmit, which contributes to the overall function of the device. Because o..

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What gives propane its distinctive odor?

Naturally, propane is odorless and tasteless. It was first discovered in 1910 and it didn't take long for inventors to figure out a way to bottle it. The first commercial marketer of propane was American Gasol Company. Through the years, the gas has been refined, and used for everything from cooking to explosive devices.\nPropane is thicker and denser than air. Therefore, in the event of a leak, it sinks down into enclosed areas, increasing the risk of explosion. Leaks need to be contained as soon as possible and the addition of an odorant helps people detect a leak and, hopefully, put a ..

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How does ozone treatment purifiy water?

Ozone is a reactive unstable gas with a very short half-life. Ozone readily gives up one of its three oxygen atoms, and this atom then bonds with unwanted substances and waterborne contaminants causing them to oxidize. Oxidization breaks down many types of organic chemicals that commonly cause taste or odor problems. Ozone oxidizes waterborne contaminants and materials 3,200 times faster than chlorine and up to 5,600 times faster than bromine. Water treatment systems that utilize ozone disinfection manufacture ozone on-site just prior to use.\nOzone purification methods may produce harmful byp..

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How much larger is Uranus than Earth?

Uranus is 31,763 miles across. Its mass is 14.5 times the size of Earth's, and it features a blend of helium that sinks from the surface into the middle, ice, ammonia and other gases. As Uranus is on its side while orbiting the sun, its center influences the weather more than the surface does. Uranus rests on its side, resulting in its equator receiving the most heat and warm winds. The presence of methane on the planet absorbs red light moving towards it, giving it a blue appearance.Because of the gas there is no firm surface, and the planet features several layers. Uranus has the solar ..

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What is bromine monochloride?

Physical properties of bromine chloride include a reddish-yellow color and an irritating odor. It is soluble in water. It reacts with water and steam to form hydrochloric acid. Bromine chloride is a strong oxidizing agent and reacts with combustible material to generate heat necessary for combustion. It decomposes above temperatures of 50 degrees Fahrenheit to form chlorine gas. The liquid is toxic and it is an irritant to the skin, eyes and mucous membranes.

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What is considered a high creatine level?

Creatine levels check kidney function. Muscular adults can have more than the normal and still be fine, while elderly individuals may have less and still be fine, according to MedicineNet.com. The normal range for those with only a single kidney is 1.8 to 1.9 milligrams per deciliter. Diabetes and high blood pressure can be one cause of raised creatine levels as well as some medications.

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What is not a polymer?

Some examples of polymers are paraffin and polyethylene, which have the molecular formulas CH3(CH2CH2)10CH3 and CH3(CH2CH2)2000CH3, respectively. Paraffin is a wax that contains 22 carbon atoms, while polyethylene is a solid consisting of 4,002 carbon atoms. Some other examples of polymers are polysaccharides and proteins.Monomers are usually small organic molecules that are able to link up with other similar types of molecules. Some examples of monomers are glucose and other simple sugars, ethylene, vinyl chloride, styrene and amino acid units.

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What is iron III bromide?

In addition, iron(III) bromide is used as a catalyst for Lewis acid in the halogenation of aromatic compounds. Commercially, this compound is supplied in black hexagonal rhombic plates. Iron(III) bromide can be made under vacuum when anhydrous bromine and iron powder react. In this reaction, the compound is sublimed and received as a black gleaming plate, according to Wiley Online Library. However, it should be handled with care as it can be fatal when ingested or inhaled. It should not be exposed to air, as it loses Br2.

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