When two or more elements combine in a chemical change, they form a ... Some substances undergo even more drastic changes and we will now ... As the material changes back to its original colour after heating gently and as ... when heated and sometimes the products are more valuable than the original materials.
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Explanation:
When two or more elements combine in a chemical change, they form a ... Some substances undergo even more drastic changes and we will now ... As the material changes back to its original colour after heating gently and as ... when heated and sometimes the products are more valuable than the original materials.