Unit one lesson one part 1 chemical reaction

Unit one lesson 1 part 2

شرح كل المعادلات بالتفصيل

شرح اول حصتين

Unit one lesson two part 1

Unit one lesson two part 2

Unit two lesson 1 part 1 (properties of electric current)

Unit two lesson 1 part 2 (properties of electric current part 2

Unit two lesson two (electric cell)

Unit two lesson 3 (radioactivity)

Unit three (the genatic)