4. Explain how the total mass of substances remain unchanged during a chemical change
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In a chemical reaction the total mass of all the substances taking part in the reaction remains the same. Also, the number of atoms in a reaction remains the same. Mass cannot be created or destroyed in a chemical reaction.
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in a chemical change the total mass of substances remain unchanged as this changed when was changed in the mass of specific substances the total mass in the substance involved in the chemical reaction in main engine let's understand this with the help of an example the mass of Iron rust is more than that of the that from the iron which is produced but if it take mass of iron oxygen and water together it remains the same
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