Which statement is true of a heterogeneous mixture but not of a homogeneous mixture? Please Help ASAP

According to each substances heat of fusion, which of the items below requires more heat to be added per gram of substance to go from solid to liquid? silver sulfur water lead

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work

Using the first volume and temperature reading on the table as v1 and t1, solve for the unknown values in the table below. remember to use the rules of significant figures when entering your numeric response.