Why does the light bulbs have to be part of the loop in order for it to be succesful?

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution?

All of the following are part of the biosphere except

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?