When you crumple a piece of paper, you change its physical properties, but not its chemical composition. Crumpling the paper compresses the cellulose fibers and creates new creases and folds, which give the paper a different shape and texture. The paper is still made up of the same cellulose fibers held together by hydrogen bonds. However, crumpling the paper can weaken or break these bonds, which can affect its strength and durability.