Which statement about a physical and chemical changes is true?
A) A change in color often occurs during a chemical change.
B) A change of state of matter always indicates a chemical change.
C) If NO change in color is visible in a process, it must be a chemical change.
D) If NO change of state of matter occurs in a process, it must be a physical change.
answer b is wrong because a change if state is a physical change. answer c is wrong because that doesnt make any sense. answer d is wrong because if there is no change in state, that doesnt mean it isnt a physical change. the right answer im pretty sure is A
