5-2 Balancing Reactions

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  • 5-2 Balancing Reactions

    1. 1. 5-2 Balancing Chemical Eq. <ul><li>Objectives: </li></ul><ul><ul><li>Balance chemical equations by manipulating coefficients. </li></ul></ul>
    2. 2. Steps to balancing equations <ul><li>Count the number of atoms or groups of atoms on each side of arrow. </li></ul><ul><li>Change one or more coefficients until the equation is balanced. </li></ul><ul><li>N 2 H 4 + O 2  N 2 + H 2 O </li></ul>
    3. 3. H 2 + O 2  H 2 O <ul><li>Only 1 oxygen atom “out” (2 “in”) </li></ul>H - 2 Only 2 hydrogen “in” (4 “out”) Recount total number of each type of atom 2 2 * Only add coefficients, NEVER Δ subscripts Can you ever make just 1 molecule of water? O - 2 H – 2 O – 1 H – 2 4 O – 1 2 2 ( ) coefficient subscript
    4. 4. NaOH  Na 2 O + H 2 O <ul><li>Only 1 sodium atom “in” (2 “out”) </li></ul>Recount total number of each type of atom 2 Na – 1 O – 1 H – 1 Na – 2 O – 1 H – 2 O – 1 2 ( ) Na – 1 2 O – 1 2 H – 1 2
    5. 5. Balancing equation <ul><li>To show mass is conserved, chemical equation must be balanced. </li></ul><ul><li>Na + H 2 O  NaOH + H 2 </li></ul>
    6. 6. Balancing equation <ul><li>To show mass is conserved, chemical equation must be balanced. </li></ul><ul><li>2 Na + 2 H 2 O  2 NaOH + H 2 </li></ul>
    7. 7. Balancing equation <ul><li>To show mass is conserved, chemical equation must be balanced. </li></ul><ul><li>2 Na + 2 H 2 O  2 NaOH + H 2 </li></ul><ul><li>HCl + CaCO 3  CaCl 2 + CO 2 + H 2 0 </li></ul>
    8. 8. Balancing equation <ul><li>To show mass is conserved, chemical equation must be balanced. </li></ul><ul><li>2 Na + 2 H 2 O  2 NaOH + H 2 </li></ul><ul><li>2 HCl + CaCO 3  CaCl 2 + CO 2 + H 2 0 </li></ul>
    9. 9. Balancing equation <ul><li>To show mass is conserved, chemical equation must be balanced. </li></ul><ul><li>2 Na + 2 H 2 O  2 NaOH + H 2 </li></ul><ul><li>2 HCl + CaCO 3  CaCl 2 + CO 2 + H 2 0 </li></ul><ul><li>Al + Cl 2  AlCl 3 </li></ul>
    10. 10. Balancing equation <ul><li>To show mass is conserved, chemical equation must be balanced. </li></ul><ul><li>2 Na + 2 H 2 O  2 NaOH + H 2 </li></ul><ul><li>2 HCl + CaCO 3  CaCl 2 + CO 2 + H 2 0 </li></ul><ul><li>2 Al + 3 Cl 2  2 AlCl 3 </li></ul>
    11. 11. Balancing equation <ul><li>To show mass is conserved, chemical equation must be balanced. </li></ul><ul><li>2 Na + 2 H 2 O  2 NaOH + H 2 </li></ul><ul><li>2 HCl + CaCO 3  CaCl 2 + CO 2 + H 2 0 </li></ul><ul><li>2 Al + 3 Cl 2  2 AlCl 3 </li></ul><ul><li>K 2 CrO 4 + Pb(NO 3 ) 2  PbCrO 4 + KNO 3 </li></ul>
    12. 12. Balancing equation <ul><li>To show mass is conserved, chemical equation must be balanced. </li></ul><ul><li>2 Na + 2 H 2 O  2 NaOH + H 2 </li></ul><ul><li>2 HCl + CaCO 3  CaCl 2 + CO 2 + H 2 0 </li></ul><ul><li>2 Al + 3 Cl 2  2 AlCl 3 </li></ul><ul><li>K 2 CrO 4 + Pb(NO 3 ) 2  PbCrO 4 + 2 KNO 3 </li></ul>

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