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Chapter 21 Section 2

Chapter 21 Section 2. Chemical Equations. Balanced Equations. Lavoisier's mercury(II) oxide reaction can be written as: How many Hg atoms on each side? How many O atoms on each side?

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Chapter 21 Section 2

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  1. Chapter 21 Section 2 Chemical Equations

  2. Balanced Equations • Lavoisier's mercury(II) oxide reaction can be written as: • How many Hg atoms on each side? • How many O atoms on each side? • Balanced chemical equation = a chemical equation with the same number of atoms of each element on both sides of the equation

  3. Choosing Coefficients • It’s a trial and error process • You may not change the chemical formulas or subscripts!!! • Let’s try adding a 2 in front of HgO to even out the O 2HgO  Hg + O2 • But then the Hg atoms are off, so lets try adding a 2 in front of Hg 2 HgO 2 Hg + O2 • It works!

  4. Try Your Balancing Act • Step 1 Write a chemical equation for the reaction using formulas and symbols. • Step 2 Count the atoms in reactants and products.

  5. Try Your Balancing Act • Step 3 Choose coefficients that balance the equation. • Step 4 Recheck the numbers of each atom on each side of the equation and adjust coefficients again if necessary.

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