Final answer:
Chemical changes involve the formation of new substances, while physical changes alter states without forming new substances.
Explanation:
Chemical change: Formation of a solid from two liquids involves a chemical change as new substances are formed. For example, when baking bread, chemical reactions transform the dough into fresh bread.
Physical change: Phase changes, such as from solid to gas, are physical changes where the substance alters its state without forming new substances.
Example: When gasoline burns, it undergoes a chemical change, turning into different substances.
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