a student is in the lab and combines two unknown substances ( which you should never do because it is not safe). one is a white solid, and the other one is clear liquid. after the substances are mixed, you observe...
1- bubbles forming,
2- dementia turns a dark purple color, and
3-the white solid substance dissolves into the liquid.



did a physical change or a chemical change happen? which of the observation would you use as evidence in why? ​