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% Error =. |measured – correct| correct. x 100 %. Chemical Reaction & How to Balance Them. Chemical Reactions. aA (s) + bB ( l )  cC (aq) + dD (g) Reactants Products Yield Phases in parentheses. Balancing Reactions. Balancing Reactions. Choose the largest compound

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  1. % Error = |measured – correct| correct x 100 %

  2. Chemical Reaction & How to Balance Them

  3. Chemical Reactions aA(s) + bB(l) cC(aq) + dD(g) Reactants Products Yield Phases in parentheses

  4. Balancing Reactions

  5. Balancing Reactions • Choose the largest compound • Make its coefficient 1 • Choose any element in that compound that appears in only 1 other location

  6. Balance that element with coefficients where that element appears • Repeat until all elements are balanced • Double if on half-unit

  7. _ MnBr3(aq) + _ F2(g) •  • _ MnF3(aq) + _ Br2(g)

  8. 2 MnBr3(aq) + 3 F2(g) •  • 2 MnF3(aq) + 3 Br2(g)

  9. Balancing Rxns • Make largest compd 1 • Balance 1 element from that compd. • Repeat until finished • Double if required

  10. _ FeCl3 + _ K2CO3 •  • _ Fe2(CO3)3 + _ KCl

  11. _NaHCO3 + Heat •  • _Na2CO3 + _H2O + _CO2

  12. __H3PO4 + __NH3 •  • __(NH4)3PO4

  13. __C4H10O2 + __O2  __CO2 + __H2O

  14. __ Fe(NO3)3 + __ K2SO4 __ Fe2(SO4)3 + __ KNO3

  15. __C2H4O + __O2  __CO2 + __H2O

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