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Balancing Equations

Balancing Equations. Alabama Course of Study. 4.) State the law of conservation of matter. 4.1Balancing chemical equations by adjusting coefficients. Chemical Equations.

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Balancing Equations

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  1. Balancing Equations

  2. Alabama Course of Study • 4.) State the law of conservation of matter. • 4.1Balancing chemical equations by adjusting coefficients

  3. Chemical Equations • Chemical Equation- representation of a chemical reaction that uses symbols to show the relationship between the reactants and products • Reactants- what is put into a reaction • Product- what forms after a reaction occurs

  4. An example • C +o2 =co2 • Reactants Product

  5. Law of Conservation of Mass • Law of mass of energy- Mass is neither created nor destroyed and both sides of the equation must be equal

  6. How many atoms are in each Compound? • H2CO3 =___H ___C ___O • H20 = ___ H ___0 • HCl = ___H ___ Cl • ZnCl2 = ___Zn ___Cl • AgNO3 =___ Ag ___N ___O • FeCl2 = ___Fe ___Cl

  7. How many atoms are in each Compound? • 2H2CO3 =___H ___C ___O • 3H20 = ___ H ___0 • 4HCl = ___H ___ Cl • 2ZnCl2 = ___Zn ___Cl • 3AgNO3 =___ Ag ___N ___O • 4FeCl2 = ___Fe ___Cl

  8. Rules to balancing equations • Rule 1- the superscript or the two inco2 cannot be changed • Rule 2- You can add a coefficient or the three in 3co2 • Rule 3- the atoms on both sides must be equal

  9. Example

  10. More problems • Na + Cl2 = NaCl • Mg + N2 = Mg3N2 • 2KI + Cl2 = KCl + I2 • FeS +HCl = FeCl2 + H2S • Na + O2 = Na20 • Ag3N = Ag + N • P4 + O2 = P2O5

  11. Different kinds of chemical reactions • Synthesis reaction- two or more substances form to make one new compound • 2Na + Cl2 = 2NaCl • 1 + 2 = 3 • C + 02 = C02

  12. Decomposition • Decomposition- single compound is broken down into two or more compounds • H2CO3 = H20 + C02 • 3 = 1 + 2

  13. Single Displacement Reactions • Single displacement- one element takes the place of another element • Zn + 2HCl = ZnCl2 + H2 • 1 + 2x3 = 1x3 + 2

  14. Double-displacement • Double- displacement- two substances change places with each other • NaCl + AgF = NaF + AgCl • 1 X2 + 3X4 = 1X4 + 3 X 2

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