Question

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what is the fundamental difference between a chemical change and a physical change?
a new substance is always formed during a
change, but never formed during
changes.
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Explanation:

A chemical change involves a reaction where the chemical composition of substances is altered, resulting in the formation of new substances with different properties. In a physical change, the substance's physical appearance may change (like shape, state - solid, liquid, gas), but its chemical identity remains the same.

Answer:

A new substance is always formed during a chemical change, but never formed during physical changes.