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*Chemical reaction involve breaking of old bonds and formation of new bonds.
*To equalise the number of atoms, we cannot alter the formulae of the compounds or element involved in the reactions.
This is a partly balanced equation as the number of oxygen are not balanced.
*The reaction between calcium oxide with water to form slaked lime is used for white washing walls. The reaction taking place is:
*The reaction between most metals and acids is also a displacement reaction as the metal displaces hydrogen from the acid.
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*The hydrogen gas is collected by the downwards displacement of water as it is lighter then water. Moreover, it is also insoluble in water.
*A physical change does not produce a new substance although the initial and final substance appear different and it is reversible.
*During a chemical change, the chemical composition of the substance change and new substance with new properties are formed. Energy is either and it is irreversible.
*A reaction is called redox when both oxidation and reduction are taking place simultaneously.
Oxidation process involves:
1. Gain of oxygen
2. Loss of hydrogen
3. Loss of electrons
Reduction process involves:
1. Loss of oxygen,
2. Gain of hydrogen
3. Gain of electrons
The substance which loses electrons
I.e gets oxidised, acts as a reducing agent and the substance which gains electrons
i. e it gets reduced and acts as an Oxidising agent.
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