C1.5 Concept & Energy Requirement of Chemical Reactions

Semester 1: Foundation of Basic Science 
Case 1: Chemistry of Life
Obj 5: Concept & Energy Requirement of Chemical Reactions

Chemical Reactions

A + B = C + D

-the making & breaking of chem bonds,leading to changes in matter composition

-are process in which electrons or group of atoms are taken up into molecules

-activation energy are required ( can be reduced by enzymes)

-divided into 2 types

1)Exergonic reaction  :  net release of free E to surroundings

-chem reactions that release free energy to the surrounding

-Δ G is negative (as it loss energy)

-occur spontaneously

2)Endergonic reaction  :  absorbs free E from surroundings

-chem reaction that absorb free energy from the suurounding

-Δ G is positive (as it gain energy)

-need supplied energy to occur