I don’t know what I’m supposed to be researching. Two examples of what?? Please help!

Which of the following ocean acidification? are the most likely side effects of a ph less than 7.0 in the ocean b. more metal salts altering the ocean chemistry c. dissolution of the shells of marine organisms d. both a & b e. all of the above.

Which symbol can be used to indicate the pressure at which a chemical reaction is carried out? 25°c 2 atm pa

How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?