9) How do you know a chemical change has occurred?
a. New bonds have formed or bonds have broken.
b. The matter has had a change in state.
c. The temperature has changed.
d. All of the above
e. Only a and c are indicators of a chemical change.
please help!!!!! 15 pts
10) If a chemical bond is formed or destroyed, what changes?
a. Energy is absorbed or released.
b. Protons are absorbed.
c. Neutrons will vary.
d. Energy is destroyed.
e. Protons are released.