Explain why sodium chloride:
a has a high melting point
b does not conduct electricity when solid
c conducts electricity when molten.
Answers
Answer
It takes a lot of energy to overcome the strong electrostatic forces of attraction between oppositely charged ions, so ionic compounds have high melting and boiling points. ... Sodium chloride is made from Na + ions and Cl - ions and has a melting point of 801°C.:
Solid sodium chloride does not conduct electricity, because there are no electrons which are free to move. When it melts, sodium chloride undergoes electrolysis, which involves conduction of electricity because of the movement and discharge of the ions.
The ions in a compound such as sodium chloride are arranged in a lattice structure. ... The ions cannot move to conduct the electric current . But when an ionic compound melts, the charged ions are free to move. Therefore, molten ionic compounds do conduct electricity.
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