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Balancing Equations

Balancing Equations. Chemical vs Physical changes. Chemical rnx (reaction) Baking a cake or burning wood Vs Water to Ice What is Water to Vapor (boiling water). Law of conservation of matter. This law states matter can neither be created or destroyed only converted. Word equation.

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Balancing Equations

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  1. Balancing Equations

  2. Chemical vs Physical changes • Chemical rnx (reaction) Baking a cake or burning wood Vs Water to Ice What is Water to Vapor (boiling water)

  3. Law of conservation of matter • This law states matter can neither be created or destroyed only converted.

  4. Word equation • (all words) Solid ammonium chromate when heated decomposes into ammonia gas and solid Chromate while giving off energy. (NH4)2(CrO4)(s) (NH4)(g) + CrO4 (s)

  5. CH4 (g) + O2 (g) H2O (l) + CO2(g) The break down: Symbols “+” separates products or separates reactants  yield, make; separates products from reactants. Points to product. (direction of rnx) g= gas or vapor l=pure liquid aq= aqueous solution; dissolved into water; all acids are aqueous. s= solid

  6. Word Problems Nitrogen gas reacts with hydrogen gas form ammonia vapor. N2 (g) + H2 (g)  ___ (g) N2 (g) + H2 (g)  NH3(g)

  7. We need coefficients to help balance equations N2(g) + 3H2 (g)  2NH3(g) What is special about the coefficient in front of the Nitrogen gas? Coefficients

  8. Tally method CH4 + 2O2 CO2 +2H2O C=1 2(O=2)=4 C=1 2(H=2)=4 H=4 O=2 2(O=1)=2 O=4

  9. In partners CuSO4 + Al  Al2(SO4)3 + Cu OR Na + H2O  NaOH + H2 **Hint----- Balance Hydrogen's Last

  10. CuSO4 + Al  Al2(SO4)3 + Cu Cu=1 Cu=1 S=1 S=3 O=4 O=12 Al=1 Al=2 3CuSO4 + 2Al  Al2(SO4)3 + 3Cu

  11. Na + H2O  NaOH + H2 Na=1 Na=1 O=1 O=1 H=2 H=3 2Na + 2 H2O  2NaOH + H2

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