Chemical Reactions Michelangelo La Mattina

What is chemical reaction? Chemical reaction tells you the substances present before and after the reactions. Reactants – substances that undergo change Products – new substances formed as a result of that change The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. Should be balanced because the masses are equal, law conservation of mass

Chemical Equation Reactants  Products Ex. –C + O  CO 2 –Carbon + Oxygen  Carbon Dioxide Chemical Equation is a representation of a chemical reaction in which the reactants and products are expressed as formulas. The way it is read – “Carbon and oxygen react and form carbon dioxide” or “The reaction of carbon and oxygen yields carbon dioxide.

Classifying Reactions Synthesis Reactions Decomposition Reactions Single Displacement Double Displacement

Synthesis reactions Reaction in which two or more substances react to form a single substance Ex. A + B  AB 2Na + Cl 2  2NaCl Eggs + Brownie mixture + water + oil  Brownies

Decomposition Opposite of Synthesis reaction Compound breaks down into two or more simpler substances AB  A + B Ex. 2H 2 O  2H 2 + O 2 Candle  Wick + Wax

Single Displacement Reaction in which one element takes the place of another element in a compound A + BC  B + AC Ex. Cu + 2AgNO 3  2Ag + Cu(NO 3 ) 2 »Pepperoni + Cheese pizza  Cheese + Pepperoni Pizza

Double Displacement Two different compounds exchange positive ions and form two new compounds AB + CD  AD + CB Ex. Pb(NO 3 ) 2 + 2KI  PbI 2 + 2KNO 3 French fries and ketchup + Hamburger and soda  French fries and soda  Hamburger and Ketchup

Where I Got My Info Science Textbook Pages

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BACKGROUNDS CITED httpyorkcountyschools.orgteachersjchristmanchemistry.jpg httpwww.flickr.comphotostheshyfox sizeso

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