Answer:
A. These vibrations can travel through solids, liquids, and gases, but not through <u>empty</u><u> </u><u>space</u>.
Number 4 I think
the atomic mass is 11 because the mass is the sum of protons and neutrons
Answer: b
Explanation: the two pieces will repel as both have obtained a static charge.
Change in state(from liquid to solid) and change in colour I believe.
