To sum-up what you have learned complete the following statements. Choose your answer inside the parenthesis. Chemical changes occur when a substance combines with another to form (1)____ (new, same) substance. These processes are called (2) ____ (chemical reaction, chemical equation) and, in general, are not (3) ____ (irreversible, reversible) except by further chemical reactions. There are some evidences of chemical change that can be observed in a matter. Lighting a matchstick is an example of (4) ____(change in intensive properties, evolution of heat and light) while adding muriatic acid in the rusting nails shows (5) ____ ( formation of precipitate, evolution of gas).

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