I just took a test in school today. What question was I asked?

Question I was asked: The boiling of water results in a physical change in matter from

I just took a test in school today. What question was I asked?

Question I was asked: A student mixed baking soda with vinegar and observed that the reaction was endothermic. When is a reaction endothermic?

I just took a test in school today. What question was I asked?

Question I was asked:
Oil, coal, and natural gas are fossil fuels formed under what conditions?