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Balancing Equations

Balancing Equations. The Law of Conservation of Mass (or Matter). In a chemical reaction, matter is neither created nor destroyed. Therefore…. What begins in a chemical reaction can be found in the end of a chemical reaction. What goes in, must come out. The Meaning of a Chemical Equation.

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Balancing Equations

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  1. Balancing Equations

  2. The Law of Conservation of Mass (or Matter) In a chemical reaction, matter is neither created nor destroyed.

  3. Therefore… • What begins in a chemical reaction can be found in the end of a chemical reaction. • What goes in, must come out.

  4. The Meaning of a Chemical Equation • They tell us… • What substances are reacting • What substances are produced • The ratios of substances reacting to those being produced

  5. Reactants The reactants are on the left side of a chemical equation 2H2 + O2 2H2O Reactants

  6. Products The products are on the right side 2H2 + O2 2H2O Product

  7. Question? However, you might ask, "On the left and right side of what?" Answer - the arrow

  8. 2H2 + O2 2H2O • On the left side are the reactants - hydrogen and oxygen • On the right side is the product - water

  9. Ca(H2PO4)2 + CaSO4 + HF Ca10F2(PO4)6 + H2SO4 There can be one, two, three, or more substances on either side of the arrow as in the above example.

  10. Coefficients Coefficients are the numbers in front of the formulas. 2 H2 + O2 2 H2O

  11. COEFFICIENTS • The coefficients give the number of molecules (or atoms) involved in the reaction. In the example reaction, two molecules of hydrogen react with one molecule of oxygen and produce two molecules of water.

  12. 3 Important Things • One: Reactants are on the left and products are on the right. Of what? The arrow • Two: Coefficients are the numbers in front of each formula. If no number is shown, a one is understood. • Three: The coefficients tell us how many molecules of each reactant used and how many molecules of each product made.

  13. Identify the reactants, the products and the coefficients of these equations: 1) Zn + 2 HCl ---> ZnCl2 + H2 2) 2 KClO3 ---> 2 KCl + 3 O2 3) S8 + 24 F2 ---> 8 SF6 4) 4 Fe + 3 O2 ---> 2 Fe2O3 5) 2 C2H6 + 7 O2 ---> 4 CO2 + 6 H2O

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