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Form 4 Chemistry Notes on Energy Changes

Institution: Secondary Level

Course: Chemistry

Content Category: Form 4 Notes

Posted By: oriango

Document Type: PDF

Number of Pages: 45

Price: KES 290
 
    

Views: 5890     Downloads: 11

Summary

Shortened Notes for teaching Chemistry in form 4. These notes are suitable for use by both students and teachers.

Brief Overview:

1. Introduction to Energy changes
Energy is the capacity to do work. There are many/various forms of energy like heat, electric, mechanical, and/ or chemical energy.There are two types of energy:
(i)Kinetic Energy(KE) ;the energy in motion.
(ii)Potential Energy(PE); the stored/internal energy.
Energy like matter , is neither created nor destroyed but can be transformed /changed from one form to the other/ is interconvertible. This is the principle of conservation of energy. e.g. Electrical energy into heat through a filament in bulb. Chemical and physical processes take place with absorption or evolution/production of energy mainly in form of heat
The study of energy changes that accompany physical/chemical reaction/changes is called Thermochemistry. Physical/chemical reaction/changes that involve energy changes are called thermochemical reactions. The SI unit of energy is the Joule(J).Kilo Joules(kJ)and megaJoules(MJ) are also used


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