When you started the activity, the can was open to the air outside tge can. how did the air pressure inside the can compare to the air pressure putside the can? (equal, lower, or higher)

The air pressure inside the can is lower compared to that of outside air pressure.

Explanation:

In general, the air pressure of an already opened can will be the same as the outside pressure.Since the can is evacuated and remain as vacuum, so there will be no pressure difference in it.If the can opens, air inside the can push the top and escapes to the outside.This is due to high pressure experienced outside the can compare to that of lower pressure inside the can and this may even cause can to collapse itself.

Answer:

a. energy is absorbed in the reaction.

explanation:

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

Sorry i dont understand the question can you rephase it?