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Lec : Balancing Chemical Equations

2 Minute Drill Homework Complete the Chemical Equation worksheet Learner Objective Learner will be able to balance the reactants and products of a chemical reaction equation . Lec : Balancing Chemical Equations.

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Lec : Balancing Chemical Equations

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  1. 2 Minute DrillHomeworkComplete the Chemical Equation worksheetLearner ObjectiveLearner will be able to balance the reactants and products of a chemical reaction equation.

  2. Lec: Balancing Chemical Equations

  3. NaOH + HClNaCl + H2OWhen balancing a chemical equation the quantity and types of elements in the reactants has to be equal to the quantity and types of elements in the products.

  4. NaOH + HClNaCl + H2OStep 1. Break the reactants and products down into the type of elements.Na NaO OH HClCl

  5. NaOH + HClNaCl + H2OStep 2. Place the quantity of each element in the reactants and products.Na:1 Na:1O:1 O:1H:2 H:2Cl:1 Cl:1

  6. NaOH + HClNaCl + H2OStep 3. Determine if the quantities of each element are the same. If they are you will state “The chemical equation is balanced. If not, state which elements are not. Na:1 Na:1 O:1 O:1 H:2 H:2 Cl:1 Cl:1

  7. Fe(s) + O2 Fe2O3Step 1:Fe FeO O

  8. Fe(s) + O2 Fe2O3Fe: 1 Fe: 2O: 2 O: 3Is this chemical equation balanced?

  9. The chemical equation is not balanced because both Fe and O are not equal.

  10. HCl + O2 Cl2 + H2O Is this chemical equation balanced?

  11. Balancing a chemical equation with a Chemical GroupPb(NO3)2 + KI PbI2+ KNO3

  12. Balancing a chemical equation with a Chemical GroupPb(NO3)2 + KI PbI2+ KNO3NO3 is a chemical group on both sides of the chemical equations.

  13. Balancing an chemical equation with a Chemical GroupPb(NO3)2 + KI PbI2+ KNO3Step 1Pb: Pb: NO3: NO3 :K: K :I: I:

  14. Balancing an chemical equation with a Chemical GroupPb(NO3)2 + KI PbI2+ KNO3Pb: 1 Pb :1NO3: 2 NO3 :1K: 1 K :1 I: 1 I: 2Is this chemical equation balanced?

  15. Challenger Balancing a Chemical Equation when the number of elements on both sides are not equal.

  16. Fe(s) + O2 Fe2O3Fe: 1 Fe: 2O: 2 O: 3

  17. Fe(s)+ 3O22Fe2O3Step 3:(reactants) (products)Fe: 1 Fe: 2O: 2 x 3 = 6 O: 3 x 2 = 6

  18. Fe(s)+ 3O22Fe2O3Step 3:The increase in O on the product side causes the Fe to increase too and now needs to be increased.Fe: 1 Fe 2 x 2 = 4O: 2 x 3 = 6 O: 3 x 2 = 6

  19. 4 Fe(s)+ 3 O22 Fe2O3Fe 1 x 4 = 4 Fe 2 x 2 = 4O 2 x 3 = 6 O 3 x 2 = 6

  20. 4 Fe(s)+ 3 O22 Fe2O3 What does this chemical reaction make?

  21. 4 Fe(s)+ 3 O22 Fe2O3 What does this chemical reaction make? Answer: Rust!

  22. Balancing an chemical equation with a Chemical GroupPb(NO3)2 + KI PbI2+ KNO3Pb: 1 Pb :1NO3: 2 NO3 :1K: 1 K :1 I: 1 I: 2

  23. Pb(NO3)2 + KI PbI2+ 2KNO3Pb: 1 Pb :1NO3: 2 NO3 :1 x 2 =2K: 1 K :1 I: 1 I: 2

  24. Pb(NO3)2 + 2KI PbI2+ 2KNO3Pb: 1 Pb :1NO3: 2 NO3 :1 x 2 = 2K: 1 x 2 = 2 K :1 x 2= 2I: 1 I: 2

  25. Pb(NO3)2 + 2KI PbI2+ 2KNO3Pb: 1 Pb :1NO3: 2 NO3 :1 x 2 =2K: 1 x 2 = 2 K :1 x 2= 2 I: 1 x 2 = 2 I: 2

  26. H2SO4 + NaOH HOH + Na2SO4

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