Physical changes | Middle school chemistry | Khan Academy
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Physical changes alter the appearance or state of matter without changing its identity. Whether bending copper wire, crushing salt, freezing water, or dissolving salt into water, the substances retain their original forms, like H₂O or NaCl. Understanding physical changes helps identify substances through properties like melting and boiling points, which are inherent and consistent across samples.
00:00 Introduction
00:33 Simple physical changes
01:26 Is phase change a physical change?
03:59 Is dissolving a physical change?
04:52 Summary
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