8. Substances expand on heating. Is that a physical change or a chemical change?
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It is aPhysical change
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➛ Substances which expands on heating, regain their original shape on cooling without forming any new substances. This change is a physical change.
➛ When matter changes its observable properties, we can say it has undergone a physical change.
➛ Physical change is a type of change where the physical properties of matter change. A change of state of matter, change in colour, odour, solubility, etc. all are examples of physical change.
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