I need help with a question so a guy said he posted something on a other question so here is link when I checked it it looked right also dont worry about the question my friend was trolling go all the way at the bottom that is the answer I think is right

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next