E-CONTENT DEVELOPMENT OF CHEMICAL CHANGES/CHEMICAL REACTIONS

I.HOME1. http://chemistry.about.com2. http://www.chemistry.umn.edu3. http://chemistry.info/chemical change/4. http://chemistry4kids.com

II.OBJECTIVE1. To develop e-content on the topic chemical change2. To understand the concept of chemical change3. To develop an idea of energy changes accompanied with chemical change4. To understand different chemical reactions

IV. E-CONTENT ANALYSIS TERMS : Chemical change,Thermo chemical reactions, Photo chemical Reactions,Electro chemical reactions FACTS1. Chemical reactions accompanied with energy changes2. During chemical reactions a new product will form3. chemical changes are permanent changes CONCEPTS1.Chemical changes are permanent changes.2.Endo thermic reactions are those which absorb heat energy3.Exothermic reactions are those liberate heat energy4.Photo chemical reactions are those reactions which absorb or release Light energy5.Electro chemical reactions are those reactions which absorb or libarate Electrical energy

Chemical change/Chemical reactions These are permanent changes and a new product is formed during the reaction. CONCEPT MAPPING OF CHEMICAL CHANGE/CHEMICAL REACTIONS

Electrical energy releasing reactionsElectro-Chemical ReactionsElectrical energy is absorbed or liberated during the reactionEndo thermic Reactions Heat absorbing reactions.Electrical energy absorbing reactionsLight producing reactionsLight Absorbing ReactionsExo thermic reactionsHeat liberating reactionsThermo- Chemical ReactionsHeat energy is absorbed or liberated during the reactionPhoto- Chemical ReactionLight energy is absorbed or liberated during the reaction

INVOLVESINVOLVESINVOLVES

TYPES TYPESTYPES

SUMMARY Chemical changes are permanent changes.A new product is obtained during chemical change.these changes are of different types.All of them are accompanied by energy changes.The main catogories include thermo chemical reactions,electro chemical reactions and photo chemical reactions.Thermo chemical reactions can again be classified into exo thermic and endo thermic reactions.Exo thermic reactions liberate heat energy and endo thermic reactions absorb heat energy.