What is the number 6.02x10^23 also known as?

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.

Compare and contrast physical changes with chemical changes.

What is the significance sodium hydroxide and hydrochloric acid