It took a force of 250 n to pull a crate weighing 765 n across the floor the work done was 3500 j how far was the crate moved

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.

ice to water 1 water to vapour 2 latent heat