Question

substance appearance odour hardness dissolves in water? conductivity in aqueous solution relative melting point ionic or molecular? moth balls white solid distinctive odour soft no cannot be measured low sodium thiosulfate (photographers \hypo\) white solid none hard and brittle yes conductor high antifreeze colourless liquid \sweet\ odour liquid yes non - conductor low potassium permanganate deep purple crystals none hard and brittle yes conductor high benzoic acid white solid distinctive odour soft a little poor conductor low 62 afir · unit 1 energy and matter

Explanation:

Ionic compounds typically have high melting - points, are hard and brittle, dissolve in water to form conducting solutions. Molecular compounds often have low melting - points, can be soft, may or may not dissolve well in water and are usually non - conductors or poor conductors in solution. Moth balls are molecular as they have low melting point, soft texture and don't dissolve in water. Sodium thiosulfate is ionic due to high melting point, hardness, brittleness and conductivity in solution. Antifreeze is molecular as it's a non - conducting liquid with low melting point. Potassium permanganate is ionic with high melting point, hardness, brittleness and conductivity. Benzoic acid is molecular as it's soft, has low melting point and is a poor conductor.

Answer:

Substance	Ionic or molecular?
sodium thiosulfate	ionic
antifreeze	molecular
potassium permanganate	ionic
benzoic acid	molecular