Which of the following is not example of chemical change
a candle burning
b cake baking
c glass breaking
d a nail rusting

Your answer is a just took the test

Answerchemical;

C. a pottery art studio

The internal energy of the system we can term it as total potential energy and kinetic energy. energy flows out of the surrounding from the system then we can say that the internal energy of the final state is lower than its initials. the sign of  δesystem is negative.δesystem = efinal - einitial=-ve  efinal  ∠einitial.