Paul’s science class fills an ice cube tray with water. the tray is placed in a freezer for a day. the water freezes forming ice. the tray is removed from the freezer and left on a counter for a day. what changes as the water freezes to ice and then melts back into liquid water? a) mass of the water molecules eliminate b) number of water molecules c) volume of water in the tray d) amount of energy in the water

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

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