The flame is lit on a hot-air balloon, and it floats up into the sky. this is an example of what kind of energy conversion?

Acycloalkane molecule contains 8 carbon atoms. how many hydrogen atoms are present in the molecule?

Achemist 16 drop copper metal from copper chloride solution. the chemist place is 0.50 g of aluminum foil in a solution containing 0.75 g of copper (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction?

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.