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Balanced Chemical Equations

C. O. O. C. O. O. C. O. O. O. C. Balanced Chemical Equations. The Law of Conservation of Mass: In any chemical reaction matter cannot be created or destroyed. H 2 (g) + O 2 (g) H 2 O (g). O. O. O. O. H. H. H. H. H. H. H. H. 2. 2.

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Balanced Chemical Equations

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  1. C O O C O O C O O O C Balanced Chemical Equations

  2. The Law of Conservation of Mass: In any chemical reaction matter cannot be created or destroyed. H2 (g) + O2 (g) H2O (g) O O O O H H H H H H H H 2 2 We call this equation unbalanced because the atoms are not conserved.

  3. Balancing Rules: You cannotchange a formula. (what it is) 2. You canONLY add a coefficient. (how many there are) 3 H2O 3

  4. 2 a. Coefficients can only be placed in front. • You can write 2 H2O, but not H22O. • 2 b. Coefficients apply to the whole molecule. 3 H2O

  5. BALANCING STEPS: • Determine the number of atoms for each element in reactants and products. • 2. Balance metals first, then non-metals. • Balance single elements last. • Check and recount all the atoms. Use trial and Error.

  6. C + O2 CO2 C: 1 C: 1 O: 2 O: 2 BALANCED

  7. 2 HCl + MgBr2 MgCl2 + HBr 2 (2) = 2 (2) = 2 H: 1 H: 1 Cl: 1 Cl: 2 Mg: 1 Mg: 1 Br: 2 Br: 1 (2) = 2 (2) = 2 BALANCED

  8. CH4 + O2 CO2 + H2O 2 2 C: 1 C: 1 H: 4 H: 2 O: 2 O: 2 + 1 (2) = 4 (2) = 4 (2) = 4 BALANCED

  9. 2 2 K(NO3) + MgMg(NO3)2 + K (2) = 2 (2) = 2 K: 1 K: 1 NO3: 1 NO3: 2 Mg: 1 Mg: 1 (2) = 2 BALANCED

  10. Balancing Word Equations

  11. Step 1: Write reactant and products using the symbols + and Step 2 : Write correct formula for reactant and product (skeleton equation) Step 3: Next we have to balance the equation Step 4:Complete the equation by adding all states (solid, liquid, gas)

  12. Solid aluminum and nitrogen gas react to produce solid aluminum nitride. +3 -3 + aluminum nitrogen aluminum nitride (s) 2 Al + NAlN (s) 2 (g) 2

  13. Solid potassium iodide and chlorine gas react to produce potassium chloride and liquid iodine. +1 -1 +1 -1 potassium iodide potassium chloride + + chlorine iodine 2 2 (l) KI + ClKCl + I (s) (g) 2 2

  14. Methane gas and oxygen gas react to produce carbon dioxide gas and water. carbon dioxide + + oxygen methane water 2 (l) CH4 + OCO2+ H2O (g) 2 (g) (g) 2

  15. explain the Law of Conservation of Mass • differentiate between subscripts and coefficients • balance skeleton equations by adding coefficients • translate word equations into balanced chemical reactions • translate balanced chemical reactions into word equations

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