4. Convert 0.27 mol of Mg, N, to grams

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?

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?