1. Chem-To-Go Lesson 20 Unit 5 WRITING AND BALANCING CHEMICAL EQUATIONS

2. CHEMICAL REACTIONS Process by which the atoms of one or more substances are rearranged to form different substances Law of Conservation of Matter – Matter is not created or destroyed during a chemical reaction.

3. Read a description of the reaction Note what is reacted with what Note what is yielded or produced Write formulas for each compound Use + to represent “and” Use  to represent “produces” or “yields” Include states of matter where available  (s) solid  (l)liquid  (g)gas  (aq) dissolved in water WRITING A CHEMICAL EQUATION Sodium permanganate reacts with magnesium chlorite to produce sodium chlorite and magnesium permanganate.

4. Read a description of the reaction Note what is reacted with what Note what is yielded or produced Write formulas for each compound Use + to represent “and” Use  to represent “produces” or “yields” Include states of matter where available  (s) solid  (l)liquid  (g)gas  (aq) dissolved in water WRITING A CHEMICAL EQUATION Solid iron reacts with oxygen gas to produce solid iron (III) oxide.

5.  Write the skeleton equation.  BE SURE THE FORMULAS ARE WRITTEN CORRECTLY.  Inventory reactants  Inventory products  Insert coefficients to make atoms of each element equal on both sides of the equation  Reduce the coefficients if possible BALANCING A CHEMICAL EQUATION NaMnO 4 + Mg(ClO 2 ) 2  NaClO 2 + Mg(MnO 4 ) 2

6.  Write the skeleton equation.  BE SURE THE FORMULAS ARE WRITTEN CORRECTLY.  Inventory reactants  Inventory products  Insert coefficients to make atoms of each element equal on both sides of the equation  Reduce the coefficients if possible BALANCING A CHEMICAL EQUATION Fe(s) + O 2 (g)  Fe 2 O 3 (s)