Acid, Base and Salts

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Chemical Reaction and Equation

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• Whenever a chemical change occurs, we can say that a chemical reaction takes place i.e Chemical reactions involve chemical changes. Chemical Change :   • If the identity, composition or nature of a chemical substance change and can not be reserved by any physical process, it is called chemical change . Chemical Reaction :   • The process involving a chemical change is called chemical reaction . • The process in which one or more substance as reactants gets converted (transformed) into new substances with new properties in product as a result of chemical change is called chemical reaction . Reactants :   • The substances that undergo chemical change or takes part in a chemical reaction is called reactants .  Products :   • The new substances produced (formed) during the reaction as a result of chemical change are called products . • Chemical reactions involves the breaking and making of bonds between atoms i.e in a chemical reaction old bonds are b...
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Light-Reflection and Refraction

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Light : • It is a form of energy that enable us to see the things around us. • When light falls on an object some of light is reflected towards us, this reflected light when enters/received by our eyes enable us to see the things. • We are unable to see anything in a dark room or where there is no light. • During the day sun is the natural source of light which helps us to see the things/objects. Properties of Light: • Light is electromagnetic wave which do not required any material medium to travel i.e It can travel in vaccum. • Light travels in a straight line. Note: The path of light changes only when there is an object in its path or when the medium changes. • Light has dual nature i.e wave as well as particle nature. • Light cast shade  • Light travels with very high speed and the speed of light is 3x10⁸ m/s or 299,792, 458 m/s. Note: No material particle can travel at a speed greater than that of speed ...
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