chemistry in everyday life
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Answers:xD nadie te contesto la pregunta lero lero xD ntc menso hasla de nuex xD FOOD CHEMISTRY ROCKS! tengo un libro de eso si decides hacerla de eso tiene ingos de info y yo te puedo ayudar :P
Answers:Chemical reactions are all around us. Combustion reactions help release energy to heat our homes and move our vehicles. Oxidation-reduction reactions keep the batteries in our cell phones and laptops functioning. Acid-base reactions take place when cleaning your oven or removing a clog from a drain. Acid-base reactions are also the basis for the Titrations experiment where you will measure the acidity of fruit juices. Understanding and identifying what takes place when two substances interact with one another is a vital aspect of chemistry. Chemists are able to identify unknown substances by observing how they react with a known substance. For example, we can bubble an unknown gas through a solution of limewater (Ca(OH)2 dissolved in water). If the limewater becomes cloudy (that is, a precipitate forms), we can say that the gas is probably carbon dioxide based on our knowledge that the calcium ion (Ca2+) forms an insoluble carbonate salt (CaCO3); if the limewater does not become cloudy, we can t identify the gas without further tests, but we can say that the gas is not carbon dioxide. It is through testing and deductive reasoning that the chemist operates. Evidence of a chemical reaction or change can often be observed when two different solutions are mixed together. Chemical reactions may often be detected visually by the following manifestations: the formation of a precipitate (insoluble substance), effervescence (gas bubbles), or color changes. Sometimes the precipitate does not immediately settle out, thereby causing a "cloudiness" to appear in the solution. Interpret "cloudiness" as the formation of a precipitate. Chemical reactions may occur even if there is not apparent change in the color of solution and if all products formed during the reaction are soluble. In general, the reactions in this experiment will follow this chemical equation: C1A1 + C2A2 ----> C1A2 + C2A1 where C represents the cations (ions with a positive charge) and A represents the anions (ions with a negative charge). When acids and bases are mixed, a salt and water are formed. For those reactions where a precipitate or cloudiness is observed, refer to "Empirical Rules for the Solubilities of Common Ionic Compounds" to aid you in determining which cation and anion form a precipitate when you observe this behavior in a reaction. The only reactions for which the above equation will not hold are those that generate gases. http://chemlab.truman.edu/CHEM100Labs/CHEMICAL%20REACTIONS%20IN%20EVERYDAY%20LIFE.pdf http://www.life123.com/parenting/education/chemistry/chemistry-in-everyday-life.shtml
Answers:H20(l) <---> H2O(g) NaCl(s) <---> Na+(aq) + Cl-(aq) O(g) + O2(g) <---> O3(g)
Answers:Culinary use ------------------- Magnesium chloride is an important coagulant used in the preparation of tofu from soy milk. In Japan it is sold as nigari ( , derived from the Japanese word for "bitter"), a white powder produced from seawater after the sodium chloride has been removed, and the water evaporated. In China it is called "lushui" ( in Chinese). Nigari or Lushui consists mostly of magnesium chloride, with some magnesium sulfate and other trace elements. It is also an ingredient in baby formula milk. Use as an anti-icer ----------------------------- A number of state highway departments throughout the United States have decreased the use of rock salt and sand on roadways and have increased the use of liquid magnesium chloride as a de-icer or anti-icer. Magnesium chloride is much less toxic to plant life surrounding highways and airports, and is less corrosive to concrete and steel (and other iron alloys) than sodium chloride. The liquid magnesium chloride is sprayed on dry pavement (tarmac) prior to precipitation or wet pavement prior to freezing temperatures in the winter months to prevent snow and ice from adhering and bonding to the roadway. The application of anti-icers is utilized in an effort to improve highway safety. Magnesium chloride is also sold in crystal form for household and business use to de-ice sidewalks and driveways. In these applications, the compound is applied after precipitation has fallen or ice has formed, instead of previously. The use of this compound seems to show an improvement in driving conditions during and after freezing precipitation yet it seems to be negatively affecting electric utilities. Two main issues have been raised regarding the anti-icer magnesium chloride as it relates to electric utilities: contamination of insulators causing tracking and arcing across them, and corrosion of steel and aluminium poles and pole hardware.