Sodium chloride is made of positive and ____ ions. The ____ charged ions attract each other . This creates strong ____ bonds which hold the ions together. The structure ____ itself in all directions and the strong bonds throughout the giant structure are very ____ to break. This requires a lot of ____ so sodium chloride has a ____ melting point. Solid ice is made of water ____. Each water molecule is made of ____ hydrogen and ____ oxygen atoms held together by strong ____ bonds. Inbetween the water molecules there are much weaker ____ forces. When ice is heated the intermolecular forces ____ and the water molecules move ____ to form a liquid. The ____ intermolecular forces do not need a lot of ____ to break so ice (water) has a ____ melting point. In the liquid they are still water molecules because the ____ covalent bonds do not break.

Explaining melting points

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