What happens to the particles of the liquid inside a thermometer when the thermometer is heated? they slow down and spread apart. they speed up and spread apart. they slow down and move closer together. they speed up and move closer together.

Speed up and spread apart

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.