One of many organic families http://www.allthingsbrewing.com/_product_54766/Fruity_Esters http://www.pachd.com/free-images/food-images.html http://www.worldcommunitycookbook.org/season/guide/peaches.html Esters One of many organic families

What are Esters? They are the product of the dehydration of an alcohol and a carboxylic acid. This process is called esterification. Water is also formed during these reactions Alcohol + Carboxylic Acid = Ester + Water

What are Esters Cont .. Esters are formed from carboxylic acids . Carboxylic acids contain -COOH groups, and in esters, the hydrogen in this groups are replaced by a hydrocarbon group, such as a methyl or an ethyl. They could also contain a benzene ring, such as phenyl.

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What are Esters Cont .. In the formation of esters, there must be an acid catalyst present. The catalyst is most often concentrated sulphuric acid but can also be dry hydrogen chloride gas. Dry hydrogen chloride gas is not used as often as it tends to cause aromatic esters.

Naming Esters Naming esters is nearly the same as naming carboxylic acids. In order to name the acid, you begin by counting up the total number of carbon atoms in the parent acid. You then change the suffix from -oic to -oate Ex. CH3CH2COOH is propanoic acid Therefore CH3CH2COO is the propanoate group Ex CH3CH2COO is the propanoate group of the ester.

Naming Esters Change the name of the alcohol to a suffix of -yl. Ex. methyl, ethyl The name of the alcohol precedes the name of the acid.

Ethyl Ethanoate The H in the -COOH group has been replaced by an ethyl group. O CH3 - C Ethyl Ethanoate O C2H5

Examples C2H5COOCH3 Methane; Methyl Three carbons; propanoate Methyl Propanoate CH3COOC6H11 Hexane; hexyl Two carbons; ethanoate hexyl ethanoate ** Typically, when propanoate is used, its given name is propionate.

Where are Esters found? Esters often contribute to flavours of fruit and many of them have fragrant odours. http://www.rapidlylosebellyfat.com/how-many-calories-are-in-an-apple-get-the-low-down-on-this-popular-fruit.html

Where are Esters found cont ... Esters are also found in fats and oils. These esters are quite complex. The difference between fats and oils are that they have different mixtures of esters http://miraclesnutrients.com/2009/01/16/what-is-fat/ http://thankgodimnatural.wordpress.com/category/hair/

Where are Esters found? Many Esters are produced naturally and can be derived from a variety of plants. They can be used to enhance the flavour of food, and are also used in synthetic fragrances. http://survivalofthesickestthebook.com/blog/?p=39

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Name that Ester! For this game we will need to divide the class into two teams. The way the game will work is that one at a time, the groups will get a chance to answer a skill testing question. Should they get it wrong, the other group will get the chance to steal.

Rules of the Game Once the question is read, anyone in that group can have a chance to answer the question by standing up. If they do have the correct answer, their group will receive one point for everyone standing up. If they get it wrong, they will lose a point for everyone standing up. Also, the opposing team will have a chance to answer, with the same rules applying.

Rules of the game Once someone has been chosen to answer, said individual must do so without aid from team-members and within a reasonable amount of time, or else they will lose the points for their team.