Is chromium plus nickel an element, compound, homogeneous or heterogeneous?

Type the letter that represents the correct location for each particle type below.

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

What is the percent by mass of magnesium sulfate in mgso4.7h2o