“The bell rings again leaving me with a deep thought of the next class. I peer to my wrist watch, carefully studying the clock rotation. It's the last subject of the day, my most hated subject Chemistry. "Good afternoon class," Mr Zack says and we all respond weakly. As usual, he hisses and face the board. Everyone knows how boring the subject he teaches, but it's mandatory. "Unsaturated Hydrocarbon," he says as he points to the maker board. "Who can tell me two difference between saturated and unsaturated hydrocarbon?"”