Final answer:
Iron filings can be separated from a mixture using a magnet due to their magnetic properties. Sulfur can be isolated via sublimation, and the remaining sugar and sand mixture can be separated by dissolving the sugar in water, then filtering and evaporating the solution.
Step-by-step explanation:
To separate the constituents of the mixture containing sulfur, sand, sugar, and iron filings, a step-by-step separation scheme can be suggested. The first step can utilize the fact that iron filings are magnetic, allowing for them to be separated using a magnet. This physical property of metals, magnetism, is what makes this separation possible.
Following this, sulfur can be separated from sand by taking advantage of sulfur's ability to sublime upon heating, turning directly from a solid to a gas without becoming liquid. Sand, which does not sublime, remains behind.
Finally, the mixture of sand and sugar can be separated by dissolving the sugar in water, followed by filtration to remove the sand, and then evaporation or crystallization to recover the sugar from the solution.