You are presented with the question "what will expand when heated?" and the following answer choices: 
- chlorofluorocarbons
 - water vapor
 - graptolites
 - hydrogen chloride
 - deoxyribonucleic acid
 - flow of electrons
 - Calcium carbonate
 - an object

Now knowing that if gas is heated then that gas will expand and hydrogen chloride is a gas, choose the best answer.


 

    hydrogen chloride     