Question

which of the following is NOT a possible sign of a physical change?

Answer 1

again! you didnt put possibilites but i say energy one...

Answer 2

A physical change is just a change in a physical property. For instance, you can freeze water, but it's still the same chemical, water! You can rip a piece of paper, and it's still water!

Now if you burn the paper, you can see that you're left with charcoal and smoke, and the fire is a highly exothermic chemical reaction!