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Magnesium is a chemical element with the symbol mg and atomic number 12. It is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (group 2, or alkaline earth metals) of the periodic table all group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure. Magnesium reacts with hydrochloric acid according to the equation mg(s) 2 hcl(aq) -- mgcl 2 (aq) h 2 (g) this demonstration can be used to illustrate the characteristic reaction of metals with acid, a single replacement reaction, or to demonstrate the generation of hydrogen gas. The flammability of hydrogen gas can be demonstrated by carefully holding a match or fireplace lighter up to. Magnesium is the lightest of all light metal alloys and therefore is an excellent choice for engineering applications when weight is a critical design element. It is strong, has good heat dissipation, good damping and is readily available. It can be alloyed with other metals, making them more beneficial. Magnesium is classified as an alkaline earth metal and has 2 hydration shells. The element can be found in abundance in the hydrosphere and in mineral salts such as dolomite and magnesium carbonate. Common dietary sources of magnesium include nuts (cashews, peanuts, almonds), beans, bananas, apples, carrots, broccoli, and leafy greens. On the other hand, the demand to reduce energy consumption increased the use of light-weight alloys in the automobile industry. As the lightest structural metal with a high specific strength and young-module, magnesium and its alloys have been widely applied in this industrial area. 76 this package contains 1 pounds of magnesium anode rod drops. When the magnesium metal burns it reacts with oxygen found in the air to form magnesium oxide. A compound is a material in which atoms of different elements are bonded to one another. Oxygen and magnesium combine in a chemical reaction to form this compound. After it burns, it forms a white powder of the magnesium oxide. 04 g and yields 40 cm 3 of hydrogen when reacted with excess acid. 50 cm 3 of 1m hydrochloric acid is a six-fold excess of acid. In this reaction, the magnesium and acid are gradually used up. However the acid is in excess, so it is mainly the loss of magnesium (surface area becomes smaller.).