Demo Teach in Balancing of Chemical Equations

According to Antoine Laurent Lavoisier, the universe is a closed system. All the matter in the universe is fixed. No mass is gain or loss during a chemical reaction. That conservation of mass in matter can be intrepret through balancing of equation.

1. The Universe is a closed system.

2. Balancing of Chemical Equation

3. How could we say that a chemical equation is balance?

4. Mg + O 2 → MgO 2Mg + O 2 → 2MgO Balance Equation

5. How do we balance a chemical equation?

6. Mg + O 2 → MgO 1. Identify the number of elements in the left and right side of the equation L R Mg O

7. Mg + O 2 → MgO L R Mg O 1 1 1 2 (2) (2) (2) 2Mg + O 2 → 2MgO

8. L R 2 O 3 1 Al 2 Al + O 2 → Al 2 O 3 (4) (2) (2) (3) (3) (4) (2)

9. CH 4 + O 2 → CO 2 + H 2 O L R C H O (2) (2) (1) (2) (4) (1) (4) (2) 2 (3) (2)

10. CFCl 3 → Cl Cl + O 3 → ClO + O 2 ClO + O 3 → Cl + O 2

11. Balance the equation : 1. Zn + HCl → ZnCl 2 + H 2 2. Fe + H 2 O → H 2 + Fe 3 O 4 3. P 4 + O 2 → P 2 O 5 4. C 2 H 8 + O 2 → CO 2 + H 2 O 5. C 2 H 8 + O 2 → CO + H 2 O

12. Thank You!!!