Question

what chemical change can cause a colour change.
also, what physical change can cause a colour change

Answer 1

1) precipitation reaction or ph solution.

2) melting of solid sulfur into liquid sulfur.. Here not only state even colour also changes..
Eg- oxygen and radon..

Hope you understood

Mark it as brainliest answer

Answer 2

Physical change

Melting solid sulfur into liquid sulfur. This is an interesting example since the state change does cause a color change, even though the chemical composition is the same before and after the change. Several nonmetals, such as oxygen and radon, change color as they change phase.

In chemical change

Phenolphthalein is a universal indicator, which means it changes color to show the pH of certain solutions. Phenolphthalein stays colorless in acidic solutions and turns pink in alkaline solutions. Sodium hydroxide is a base, so when you add phenolphthalein, the solution turns pink. Other indicators commonly used in the laboratory are litmus and methyl orange. A Litmus indicator solution goes red in acidic solutions, blue in alkaline solutions and purple in neutral solutions. Methyl orange turns red in acidic solutions and yellow in neutral or alkaline solutions.