I am tryna make sure of my answer is this correct

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?

How many grams of aluminum will there be in 98g of al2o3?

Which statement best describes the he properties of iconic compounds ?