Need help A sample contains 18mg of radon-222. You estimate that this is 0.01% of the original isotope. How many half-lives have passed?

Seltzer water is created by placing water under pressure with carbon dioxide gas. which of the following statements best describe seltzer water: a. the solution will be slightly acidic b. the solution will be slightly basic. the solution will be strongly acidic. d. the solution will be strongly basic. e. the solution will be neutral

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

How does climate change cause the ocean's thermohaline current to slow down?