1. Writing Chemical Reactions 4.1

2. Reactants Before the reaction takes place

3. Products After the chemical took place

4. Law of Conservation of Matter
Matter is not created or destroyed only TRANSFERRED
To accomplish this when writing a reaction you use coefficients

5. Law of Conservation of Matter

6. Practice Balance the following:
______ KOH(s) ----∆-----> _____ K₂O(s) + _____ H₂O(g)

7. Practice Balance the following:
__ K + _____ H₂SO₄ > _____ K₂SO₄ + _____ H₂

8. Practice Balance the following:
____ NaOH(aq)+ ____ Fe(NO₃)₃(aq)-----> ____NaNO₃(aq)+ ___ Fe(OH)₃(s)

9. Some Chemical Symbols *Symbols used when writing chemical reactions

10. Chemical Reaction
The following slides demonstrate the five ways to determine if a chemical reaction has taken place.

11. Proof of a chemical reaction Light generated

12. Proof of a chemical reaction Temperature Change – Exothermic

13. Proof of a chemical reaction Temperature Change – Endothermic The water between the beaker and wood froze and linked them.

14. Proof of a chemical reaction Gas forms

15. Proof of a chemical reaction Precipitate forms

16. Proof of a chemical reaction Color change