Define a chemical reaction. State four observations which help us to determine that a chemical reaction has taken place. Write one example of each observation with a balanced chemical equation.
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Explanation:
Chemical reaction is a reaction in which a new substance is formed . when the two elements are reacted with each other. if the new substance is formed then it is a chemical reaction let us take an example of paper if we burns then it turns into ashes it means a new substance is formed.
the example of chemical reaction is NaCl
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