Balancing Chemical Reactions

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Presentation Description

Instruction and hints on how to balance a chemical equation.

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How to Balance Equations: 

How to Balance Equations Count the number of each element on each side of the equation Pick an element to balance first. Use coefficients in front of products/reactants to make the number of atoms equal on both sides.

Hints for balancing:: 

Hints for balancing: Element appears on one side of the equation: In more than one place on one side of the equation By itself Balance it last! 2. Treat polyatomic ions as a single unit (if they appear on both sides of the equation).

PowerPoint Presentation: 

Rule of Thumb Never change a subscript in an attempt to balance an equation – only change the coefficients. To change the subscripts would be to change the identity of the compounds present – and we can’t do that!!!

Back to our skeleton equation…: 

Back to our skeleton equation… Elemental copper and aluminum chloride are formed when aluminum is added to a copper (II) chloride solution. Cu Cl (aq) 2 + Al Al Cl (aq) 3 + Cu 2 3 3 2 (s) (s)