1. Balancing equations

2.  a balance chemical equation is a short hand method of expressing what happens in a chemical reaction.  Its like a recipe.  1 cup flower + 1 egg + ½ cup choc chips → 12 cookies

3.  There are three steps to writing a complete balanced equation

4. Step 1 Write the Word Equation  The most basic type of equation is a word equation.  Hydrogen + oxygen yields water  It doesn’t give a lot of information

5. Step 2 write the Skeletal Equation  That means change the words in the word equations into the correct symbols and formulas.  H 2 + O 2 → H 2 O  Just like you did in the unit on naming and formula writing

6. Step 3 satisfy the law of conservation of matter  Make sure there are equal numbers of every atom on both sides of the yield sign.  2H 2 + O 2 → 2 H 2 O  Do this by changing only the coefficents in front of the formulas, never the subscripts

7. Practice 1  Word equation of known facts  Potassium chlorate decomposes to potassium chloride and oxygen

8. Skeleton  KClO 3 → KCl + O 2

9. Balanced  2 KClO 3 → 2 KCl + 3 O 2

10. Practice II  Aluminum hydroxide decomposes to Aluminum oxide and water.

11.  Al(OH) → AlO + HO  Al(OH) 3 → Al 2 O 3 + H 2 O

12.  2Al(OH) → AlO + 3 HO  2Al(OH) 3 → Al 2 O 3 + 3 H 2 O