1) Reversible Changes-A change that can be undone or reversed, allowing the substance to return to its original state. 2) Melting Ice: Ice melts into water, but freezing the water reforms ice. 3) Boiling Water: Water turns to steam, but condensing the steam returns liquid water. 4) Folding Paper: Folding and unfolding paper restores its original shape. 5) Dissolving sugar in water and then evaporating the water to get the sugar back.

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