Chemical Reactions/Changes
Balancing Equations Cartoon Video
The pH Factor Interactive
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When food cooks, it can change color, consistency, and it can burn which creates a new substance. Cooking creates smells and requires a change of energy that are both evidence for chemical change.
Chemical changes create new substances, are hard to reverse, and may give off light, heat or odor.
Physical changes do not create new substances, are reversible and often involve a change of shape or phase.
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