Why do some substances conduct electricity?
Conduction of electricity
Ionic compounds conduct electricity when molten (liquid) or in aqueous solution (dissolved in water), because their ions are free to move from place to place. … Ionic compounds are conductors of electricity when molten or in solution, and insulators when solid.
Why do some substances conduct electricity and some not?
Ions are atoms or small groups of atoms that have an electrical charge. Some ions have a negative charge and some have a positive charge. Pure water contains very few ions, so it does not conduct electricity very well. … Some substances that are made of molecules form solutions that do conduct electricity.
Why do some things conduct electricity better than others?
why do metals conduct heat and why are some metals better than others at conducting heat? … Most ordinary metals have about the same density of electrons (number per volume), so the main reason for the differences in how well they conduct electricity is the difference in how easily the electrons move around.
Do all substances conduct electricity?
Not all substances conduct electricity. Water is a poor conductor of electrical current which is why sulfuric acid was added during the electrolysis experiment. Solutions that conduct electrical current do so because they ionize in solution.
What makes substance a conductor?
According to band theory, a conductor is simply a material that has its valence band and conduction band overlapping, allowing electrons to flow through the material with minimal applied voltage.
Why do some substances have no charge?
Recall that neutral atoms have an equal number of protons and electrons. The result of this is that the total positive charge of the protons exactly cancels the total negative charge of the electrons, so that the atom itself has an overall charge, or net charge, of zero.
What makes a substance a good conductor of electricity?
For a material to be a good conductor, the electricity passed through it must be able to move the electrons; the more free electrons in a metal, the greater its conductivity.