Mrs. Johnston heated 5 grams of sugar. The sugar first looked shiny, then melted and became dark brown. Finally, all that was left was a black, shiny substance. She then heated 5 grams of sand in the same way. The sand’s appearance did not change. What explains these results? F Sand is an element, but sugar is a compound. G Heating the sugar caused a chemical change. H Heating the sand caused a chemical change. J Heating the sugar caused it to melt.