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Chapter 3 Chemical Reactions - Texas A&M University

Chapter 3 Chemical Reactions PRACTICING SKILLS Balancing Equations Balancing equations can be a matter of running in cir cles if a reasonable methodology is not employed. While th ere isn't one right place to begin, g enerally you will suffer fewer complications if you begin the b alancing process using a substance th at contains the g reatest number of elements or the largest subscript values. Noting th at you must h ave at least th at many atoms of each elemen t involved, co efficients can be used to increase the "atomic inventory". In the nex t few questions, you will see one emboldened substance in each equation. This embold ened substan ce is the one that I judge to be a good starting place.

Reactants: iron(III) oxide and magnesium Products: magnesium oxide and iron (b) AlCl3(s) + 3 NaOH(aq) Al(OH)3(s) + 3 NaCl(aq) 1. Note the need for at least 1 Al and 3 Cl atoms. 2. 3 NaCl molecules would provide the proper Cl atom inventory. 3. 3 NaCl would require 3 Na atoms on the left side—a coefficient of 3 for NaOH is needed. 4.






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