6. Describe a chemical change that is harmful and
Explain why you consider it as harmful?
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The two chemical changes which are harmful to us are given below: Rusting on metal objects as it deteriorates the metal surface and decreases the efficiency of it. Rancidity of food items which spoil the foodstuff as it is an oxidation process of food items that spoil the food permanently.
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Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. An example of a chemical change is the reaction between sodium and water to produce sodium hydroxide and hydrogen.
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