What is a Chemical Change?
A chemical change occurs when a substance undergoes a chemical reaction and produces a new substance. Signs of a chemical reaction include color change, production of heat or light, gas production, odor, or sound.
Examples include iron rusting, cooking an egg, burning wood, or photosynthesis. Chemical changes often release energy also known as being exothermic.
What is a Physical Change?
A Physical change affects the size, shape, color or matter of a substance but does not affect its composition. The starting and ending materials of a physical change are the same even though they may appear different. Examples include melting an ice cube, boiling water, and breaking glass. Physical changes are endothermic meaning they absorb energy.
Come gather round people wherever you roam and test your knowledge on differentiating the two types of changes while listening to some Bob Dylan.
QUIZ
MUSIC
Thanks for a-tunin' in!
-George Spencer
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