Is paper a physical or chemical change?

Answer 1

Litmus is a water-soluble mixture of different dyes. It is often absorbed onto filter paper to produce one of the oldest forms of pH indicator, used to test materials for acidity. Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic (i.e. alkaline) conditions, with the color change occurring over the pH range 4.5 - 8.3. Neutral litmus paper is purple in color. Litmus can also be prepared as an aqueous solution that functions similarly. Under acidic conditions the solution is red, and under basic conditions the solution is blue. So the litmus paper turning blue or red is a "Chemical Change".

Answer 2

Any color, or even lack of color, is a physical property.

Mixing 2 substances together and getting a cange in color may be evidence of a chemical change, but just looking a one substance and describing its color is a physical property.

Answer 3

It is a chemical change because it is a change of color.

And because is a difference between formulas: CoCl2 is blue and CoCl2.2H2O is purple.

Answer 4

Paper is a substance, not a change: so the answer is none of both.

Answer 5

It is a physical change because it is still paper.

Answer 6

Physical change

Answer 7

Physical.