I. THE MEANING OF A CHEMICAL EQUATION - …

WRITING CHEMICAL EQUATIONS 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 Department of Chemistry, Pima Community College 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.

6 c. A Halogen + halide salt A halogen (F, Cl, Br, I, At) will displace any less active halogen from a halide salt. The order of activity decreases going from top to bottom down the halogen family in the periodic table.

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  Table, Periodic, Periodic table

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