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Balancing Equations Chapter 6

Balancing Equations Chapter 6. What is balancing an equation?. Balancing an equation is changing the ratios of molecules/atoms to make the lowest possible same whole number and type of atoms on each side of the equation. Na + Cl 2  NaCl. 2. 2. What you can not do!.

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Balancing Equations Chapter 6

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  1. Balancing EquationsChapter 6

  2. What is balancing an equation? • Balancing an equation is changing the ratios of molecules/atoms to make the lowest possible same whole number and type of atoms on each side of the equation. • Na + Cl2 NaCl 2 2

  3. What you can not do! • You can NOT change the formula of the molecules I give you. • H2 + O2 H2O • you cannot change water to H2O2 (hydrogen peroxide) If the number is one, you don’t have to write it! 2 2 and this will make 2 water molecules you have to increase the amount of H on this side H H O O H O  H H H O H H

  4. What you are allowed to do • change the coefficient in front of any molecule/atom (changing the ratio of atoms) • ___ Ag + ___ Cl2 ___ AgCl • you can only write on those lines 2 2

  5. Problem solving strategies • It helps to make a list of all atoms present • HCl + Ba(OH)2 BaCl2 + H2O 2 2 Ba – 1 H – 2 Cl – 2 O – 1 Ba – 1 H – 3 Cl – 1 O – 2 Start making the numbers agree one at a time (pick something, that occurs in only one molecule 1st) ~not H in this case Now going to O 4 2 4 2 Now everything is balanced! starting w/ Cl

  6. Another to try 2 • CH4 + O2 H2O + CO2 • C- 1 C- 1 • H- 4 H- 2 • O- 2 O- 3 2 4 4 4 Everything is balanced now! This takes a lot of trial and error. Start with H now O

  7. More Practice 2 • NH4ClO3 + CaSO4 •  Ca(ClO3)2 + (NH4)2SO4

  8. Homework • HNO3 + Zn  H2 + ZnNO3

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