chapter 3 lesson 10 part 1 (chemical equilibrium) for 3rd secondary students ♥️
35:16
chapter 3 lesson 12 part 2 (chemical equilibrium-3) for 3rd secondary students ♥️
32:39
chapter 3 lesson 10 part 2 ( chemical equilibrium -1) for 3rd secondary students ♥️
30:49
chapter 3 lesson 10 part 3 ( chemical equilibrium -1) for 3rd secondary students ♥️
44:55
chapter 3 lesson 11 part 1 ( chemical equilibrium -2) for 3rd secondary students ♥️
50:28
chapter 4 lesson 15 part 1 ( electrochemistry-2 ) for 3rd secondary students ♥️
36:16
chapter 3 lesson 11 part 2 ( chemical equilibrium-2 ) for 3rd secondary students ♥️
36:21
chapter 3 lesson 11 part 3 (chemical equilibrium-2 ) for 3rd secondary students ♥️
36:40