Chemistry. CHEMICAL CHANGES In a chemical change, a new substance or substances appear. Chemical changes are not reversible by normal methods.
Ch. 3: Matter and Energy Dr. Namphol Sinkaset Chem 152: Introduction to General Chemistry.
Class II B Pratolungo I. C. via Palombini 2007-2008Teachers: Anna Donegà/lea Santigliano Anna Donegà/lea Santigliano.