Description
Ethanol (also called ethyl alcohol, grain alcohol, drinking alcohol, or simply alcohol) is a chemical compound, a simple alcohol with the chemical formula C2H6O. Its formula can be also written as CH3−CH2−OH or C2H5OH (an ethyl group linked to a hydroxyl group), and is often abbreviated as EtOH. Ethanol is a volatile, flammable, colorless liquid with a slight characteristic odor. It is a psychoactive substance and is the principal active ingredient found in alcoholic drinks. Ethanol is naturally produced by the fermentation of sugars by yeasts or via petrochemical processes, and is commonly consumed as a popular recreational drug. It also has medical applications as an antiseptic and disinfectant. The compound is widely used as a chemical solvent, either for scientific chemical testing or in synthesis of other organic compounds, and is a vital substance used across many different kinds of manufacturing industries. Ethanol is also used as an alternative fuel sourceVinegar is an aqueous solution of acetic acid and trace chemicals that may include flavorings. Vinegar typically contains 5-8% acetic acid by volume. Usually the acetic acid is produced by the fermentation of ethanol or sugars by acetic acid bacteria. There are many types of vinegar, depending on source materials. Vinegar is now mainly used in the culinary arts: as a flavorful, acidic cooking ingredient, or in picklingAs the most easily manufactured mild acid, it has historically had a wide variety of industrial and domestic uses (such as its use as a household cleaner)Citric acid is a weak organic acid that has the chemical formula C6H8O7. It occurs naturally in citrus fruits. In biochemistry, it is an intermediate in the citric acid cycle, which occurs in the metabolism of all aerobic organismsMore than two million tons of citric acid are manufactured every year. It is used widely as an acidifier, as a flavoring and a chelating agentA citrate is a derivative of citric acid; that is, the salts, esters, and the polyatomic anion found in solution. An example of the former, a salt is trisodium citrate; an ester is triethyl citrate. When part of a salt, the formula of the citrate anion is written as C6H5O3−7 or C3H5O(COO)3−3These questions will give you basic idea for Examination Preparation and/or interview on Ethanol Production, Vinegar and Citric Acid. Please Note: These questions are only for practice and understanding level of knowledge only. It is not necessary that these questions may or may not appear for examinations and/or interview questionsIn this practice test, because of large amount of questions (around 37 questions) some of questions may have repeatedI had to put as 70% pass rate because there may also be wrong answers from my side
