Chemical change_WEEKkkkkkkkkkkkkkkkk 6.1.pptx

lecture

1. CHEMICAL REACTION In chemical change, a chemical reaction takes place. Chemical reaction is a process in which new substance with new properties are formed.

2. CHEMICAL EQUATION

3. CHEMICAL EQUATION In cooking Adobo, assembling a bicycle, or preparing a recipe for a cake, you follow set of direction – what materials to use, how much of each material needed, and the product that you want to obtain.

4. In chemistry, a __________________ is needed to find the amount of materials (____________)that you need and the new substance (_____________) to be formed. Reactant ------ --> Product

5. GIVE EXAMPLES OF REACTANTS AND PRODUCTS THAT IS COMMON IN OUR EVERYDAY LIVES.

6. You have to know how much of the reactants will give how much of a product. 2 cups of rice + 2 cups of water - -> 4 cups boiled rice

7. Atoms cannot be created nor destroyed. It follows the law of conservation of matter. Atoms of reactants are just rearranged to form new products.

8. Count the numbers of atoms in the reactant side and product side.

9. EXAMPLE

10. a.) C 4 H 8 + O 2  CO 2 + H 2 O reactant side product side

11. a.) C 4 H 8 + O 2  CO 2 + H 2 O reactant side product side C - H - O -

12. a.) C 4 H 8 + O 2  CO 2 + H 2 O reactant side product side C - C - H - H - O - O -

13. a.) C 4 H 8 + O 2  CO 2 + H 2 O reactant side product side C - 4 C - 1 H - 8 H - 2 O – 2 O - 2+1=3

14. a.) C 4 H 8 + 6O 2  4CO 2 + 4H 2 O reactant side product side C - 4 C - H - 8 H - O – 12 O -

15. a.) C 4 H 8 + 6O 2  4CO 2 + 4H 2 O reactant side product side C - 4 C - 4 H - 8 H - 8 O – 12 O - 12

16. a.) C 4 H 8 + 6O 2  4CO 2 + 4H 2 O reactant side product side

17. Seatwork:

18. Answer the ff balancing chemical equation a.) Zn + CuSO 4  Cu + ZnSO 4 b.) BaSO 4 + 2NaCl  Na 2 SO 4 + BaCl 2 c.) 2Fe + 3Cl 2  2FeCl 3 d.) 4NO 2 + 2H 2 O + O 2  4HNO 3

19. Balancing Chemical Equations