What is the difference between a chemical reaction and a physical change?

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What is the difference between a chemical reaction and a physical change?
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What is the difference between a chemical reaction and a physical change?
What is the difference between a chemical reaction and a physical change?

What is the difference between a chemical reaction and a physical change?
Chemical changes produce new substances,not a physical change

物理变化和化学反应的变化有什么不同?

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之间的区别是什么化学反应和物理变化?

化学反应和物理变化的区别是什么?