4. After generating and collecting the oxygen, you will then investigate its role in combustion reactions
a. Is oxygen a reactant or product in a combustion reaction?
b. Are combustion reactions exothermic or endothermic?
5. In Part B you will burn a variety of substances in the oxygen gas collected from Part A.
a. Which one of these substances must be burned in the hood?
b. Which two of these substances must be burned in air only?
c. Which substance, one only, will the instructor burn?