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 ♥️
35:16
chapter 3 lesson 12 part 2 (chemical equilibrium-3) for 3rd secondary students ♥️
38:17
chapter 4 lesson 15 part 2 (electrochemistry-2 ) for 3rd secondary students ♥️
33:19
chapter 3 lesson 13 part 1 ( chemical equilibrium-4) for 3rd secondary students ♥️
31:40
chapter 4 lesson 14 part 2 (electrochemistry-1) for 3rd secondary students ♥️
29:29
chapter 1 lesson 8 - environmental balance - integrated science
26:02
chapter 3 lesson 13 part 2 (chemical equilibrium-4) for 3rd secondary students ♥️
35:44