can someone please answer this question for me? i will mark brainliest and it would also be really appreciated! :)


which of the following is a sign a chemical reaction has occurred?


A- A blue liquid is mixed into a yellow liquid, and the mixture turns green.
B- A piece of metal is placed in Water and produces sparks and gas.
C- A liquid is heated on a hot plate, And bubbles form.
D- A solid powder is mixed into a liquid and disappears.