Which of the following is always true when a substance undergoes a physical change ?
a. the composition changes.
b. a change in color occurs.
c. no new substance is formed.
d. its specific gravity remains the same.

A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions. Chemical reactions are usually characterized by change in color, heat change, precipitate formation and evolution of bubbles.

Example: Oxidation of magnesium

[tex]2Mg+O_2\rightarrow 2MgO[/tex]

Which of the following is always true when a substance undergoes a physical change ? a. the composition changes. b. a change in color occurs. c. no new substance is formed. d. its specific gravity remains the same.

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Which of the following is always true when a substance undergoes a physical change ?
a. the composition changes.
b. a change in color occurs.
c. no new substance is formed.
d. its specific gravity remains the same.