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WRITING CHEMICAL EQUATIONS

WRITING CHEMICAL EQUATIONS . 2019, 2004, 2002, 1989 by David A. Katz. All rights reserved. Permission for classroom used provided original copyright is included. David A. Katz Chemist, Educator, Science Communicator, and Consultant I. THE MEANING OF A CHEMICAL EQUATION. A CHEMICAL equation is a chemist's shorthand expression for describing a CHEMICAL change. As an example, consider what takes place when iron rusts. The equation for this change is: Fe + O2 Fe2O3. In this expression, the symbols and formulas of the reacting substances, called the reactants, are written on the left side of the arrow and the products of the reaction are written on the right side. The arrow is read as gives , yields , or forms and the plus (+) sign is read as and . When the plus (+) sign appears between the formulas for two reactants, it can be read as reacts with . (The + sign does not imply mathematical addition.)

balanced so that it conforms to the Law of Conservation of Matter. That is, there must be the same number of atoms of each element on the right hand side of the equation as there are on the left hand side. If the number of atoms of each element in the equation above are counted, it is observed that there are 1 atom of Fe

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