chemical reaction equation

1. Chemical Reaction Equation
Viandhika Ditama, S.pd

2. Definition chemical reaction
Also called the chemical change.
Indication :
1.sedimentation
2.Gas forming
3.Color change.

3. Naming the chemical reaction
equation
Generally,reaction equation is described as
follow :
aA (a) + bB(b) →cC (c) + dD (d)

4. Naming the chemical reaction
equation
The following step in writing a chemical reaction
equation:
1. Determine the reactants and the products
2. Write the atomic symbol of each substance
3. Write the symbol of (+) and (→)
4. Balance the number of each atom in both left
and right sides.

5. Naming the chemical reaction
equation
The reaction between potassium metal and
chlorine gas can be decribed into chemical
reaction as follow
2K (s) + Cl2(g) →2KCl(s)

6. Balancing the chemical
equation
1. Trial method
Mg (s) + O2(g) →MgO(s)
Mg (s) + O2(g) →2MgO(s)
2Mg (s) + O2(g) →2MgO(s)

7. Balancing the chemical
equation
Example :
Na (s) + H2O(l) →2NaOH(aq) + H2(g)
2Na (s) + H2O(l) →2NaOH(aq) + H2(g)
2Na (s) + 2H2O(l) →2NaOH(aq) + H2(g)
2Na (s) + 2H2O(l) →2NaOH(aq) + 2H2(g)

8. Balancing the chemical
equation
2. Mathematical equation method
aMg (s) + bO2(g) →cMgO(s)
To equalize Mg atom : a = c
To equalize O atom : 2b = c
For instance, b=1, then c=2
Add the a,b,and c value into the equation
2Mg (s) + O2(g) →2MgO(s)

9. Balancing the chemical
equation
Example :
H2 (g) + O2(g) →H2O(l)
To equalize H atom : a = c
To equalize O atom : 2b = c
For instance, a=1, then c=1
2b=c
2b=1
B=1/2
Add the a,b,and c value into the equation
H2 (g) + ½ O2(g) →H2O(l)