Why does the properties of the substance change when after mixing and heating it?

Answer 1

Sometimes this is because of a physical change (such as the denaturing of the albumin in an egg white). You can see the change.

Sometimes this is because of a chemical reaction (such as a mixture of Iron powder and Sulfur). In this case the reaction is:

8 Fe (s) + S8 (s) --> 8 FeS (s)

Iron (II) sulfide is made.

Answer 2

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