If you cut the cube and keep all the pieces you are causing only physical change
Answer/Explanation:
In June 1998 in Japan a scientist discovered that neutrinos (which is a type of particle) has weight, mass. This was later proven with some very convincing strong evidence.
<u><em>~ LadyBrain</em></u>
Opposite pairs form ionic bonds, due to this the answer is D - Li and Br; They have unlike charges.