The identities of substances are the same before and after which type of change?A.A change of stateB.A physical changeC.A chemical changeD.No change
Question
The identities of substances are the same before and after which type of change?A.A change of stateB.A physical changeC.A chemical changeD.No change
Solution
The identities of substances remain the same before and after a physical change (Option B). This is because a physical change does not alter the composition of a substance, only its physical properties such as shape, state, or temperature. For example, water freezing into ice is a physical change because the water molecules are still water molecules before and after the change.
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