compound description Compound | is a yellow-white solid. When heated to melting, it forms an oily yellow liquid, which is a good electrical insulator. ionic or molecular? ionic molecular (can't decide) Compound 2 is a hard grayish-white solid. A small 250. mg sample of it is put into a quartz tube and heated strongly. It starts to melt at 1055. C. ionic molecular (can't decide) Compound 3 is a hard white smooth odorless solid, which is insoluble in water. If the flame from an ordinary laboratory burner is held on the solid for 10 minutes, the solid grows hot to the touch but does not soften. ionic molecular (can't decide)