chapter 3 lesson 13 part 1 ( chemical equilibrium-4) for 3rd secondary students ♥️
26:02
chapter 3 lesson 13 part 2 (chemical equilibrium-4) for 3rd secondary students ♥️
1:02:35
chapter 4 lesson 14 part 1 (electrochemistry-1) for 3rd secondary students ♥️
36:40
chapter 3 lesson 12 part 1 (chemical equilibrium-3) for 3rd secondary students ♥️
35:44
revision on chapters 1 & 2 part 1 for 3rd secondary students ♥️
31:40
chapter 4 lesson 14 part 2 (electrochemistry-1) for 3rd secondary students ♥️
44:55
chapter 3 lesson 11 part 1 ( chemical equilibrium -2) for 3rd secondary students ♥️
28:19
Knowledge is very important for kids
30:49