A. When 0.5g of iron filing was placed in a container with 2.0g of sulfur powder, this is called a mixture. A chemical change will be observed. B. A chemical change is observed if there is a new product formed. - Statement A is correct and statement B is incorrect. - Statement A is incorrect and statement B is correct. - Both statements are correct. - Both statements are incorrect.

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".