Cambridge Secondary (7-9). Stage 9. MCE Science. Workbook - Unit 5: Chemical Bonding and Structure of Materials - Question 17

The teacher demonstrates heating wax, potassium iodide, zinc chloride and sulfur separately, then testing each molten sample with graphite electrodes, a lamp and cells. Record your own observations; no measured results are supplied.

Based on the data you recorded, arrange the solid substance in increasing melting point.