Learn the Types of Chemical Formulas

Learn the Types of Chemical Formulas A chemical formula is an expression that states the number and type of atoms present in a molecule of a substance. The type of atom is given using element symbols. The number of atoms is indicated by a subscript following the element symbol. Chemical Formula Examples There are six C atoms and 14 H atoms in a hexane molecule, which has a molecular formula of: C6H14 The chemical formula of table salt or sodium chloride is: NaCl There are one sodium atom and one chlorine atom in each molecule. Note there is no subscript for the number 1. Types of Chemical Formulas While any expression that cites the number and kind of atoms is a chemical formula, there are different types of formulas, including molecular, empirical, structure, and condensed chemical formulas. Molecular Formula Also known as the true formula, the molecular formula states the actual number of atoms of the elements in a single molecule. For example, the molecular formula of the sugar glucose is: C6H12O6 Empirical Formula The empirical formula is the simplest ratio of the whole number of elements in a compound. It gets its name because it comes from experimental or empirical data. Its sort of like simplifying mathematical fractions. Sometimes the molecular and empirical formula are the same, such as H2O, while other times the formulas are different. For example, the empirical formula of glucose is: CH2O This is obtained by dividing all of the subscripts by the common value (6, in this case). Structural Formula Although the molecular formula tells you how many atoms of each element are present in a compound, it does not indicate the way the atoms are arranged or bonded to each other. A structural formula shows the chemical bonds. This is important information because two molecules may have shared the same number and type of atoms yet are isomers of each other. For example, ethanol (grain alcohol people can drink) and dimethyl ether (a toxic compound) share the same molecular and empirical formulas. There are different types of structural formulas, too. Some indicate the two-dimensional structure, while others describe the three-dimensional arrangement of atoms. Condensed Formula One particular variation of an empirical or structural formula is the condensed formula. This type of chemical formula is a sort of shorthand notation. The condensed structural formula may omit the symbols for carbon and hydrogen in the structure, simply indicating the chemical bonds and formulas of functional groups. The written condensed formula lists the atoms in the order in which they appear in the molecular structure. For example, the molecular formula of hexane is: C6H14 However, its condensed formula is: CH3(CH2)4CH3 ï » ¿This formula not only provides the number and type of atoms but also indicates their position in the structure.

Ways to Reduce Fluoride Exposure

Ways to Reduce Fluoride Exposure If youre looking to reduce your intake of fluorine and fluoride (one is the element, one is the ion, both are toxic), it may help you to know what everyday products contain them and what steps you can take to limit your exposure: Dont drink unfiltered public water. Assume its fluoridated unless you know otherwise. Most home water filters will not remove fluoride.Dont take fluoride supplements.Try to limit drinking soda because its generally made with fluoridated water. Reconstituted fruit juice, beer, and wine also tend to be made with fluoridated water. Read labels on bottled beverages and look for water purifed using reverse osmosis or distillation. If those processes are not specifically named, assume the water is fluoridated.Read the label on bottled water. Again, look for water purified using reverse osmosis or distillation.Consider using unfluoridated toothpaste.Avoid drinking black or red tea. Black and red tea come from two different types of plants, but both leaves naturally contain high amounts of fluorine. If you drink tea, brew it yourself, using unfluoridated water.Choose organic fruits and vegetables since the US National Organic Program does not permit the use of the pesticides that leave high fluoride residues. Expect tinned fish and canned food items to contain fluoride.Avoid or limit your consumption of mechanically deboned chicken in any form, including chicken nuggets, canned chicken, and baby food. Traces of fluoride (from bones) remain from the deboning process.Fluoride may be used as a preservative in many products.Sometimes you will be able to see this on the product label.Avoid black or red rock salt or items containing black or red rock salt.Avoid using chewing tobacco.Avoid long term use of medications that contain fluorine.If you use a fluoridated toothpaste, rinse your mouth with water after brushing your teeth.If you need anesthesia, ask your doctor about options using drugs that do not contain fluorine.Avoid overheating teflon pans while cooking, as some of the teflon (a fluorine compound) may be released into the air.