Which of the following statements concerning the separation of metal ions into analytical groups i-v is/are correct? 1. only the least soluble sulfides will precipitate in an acidic solution of h2s. 2. k+ and na+ are precipitated in the last step of the separation scheme. 3. the formation of a precipitate with the addition of dilute hcl(aq) indicates the original solution contains all of the ions of analytical group i (the ions which precipitate as chlorides). a. 1 only b. 2 only c. 3 only d. 1 and 2 e. 1, 2, and 3

Select the atomic models that belong to the same element

Fugu, also known as puffer fish, is a sushi delicacy that can also be lethal. puffer fish contain a powerful toxin that can kill an adult a few hours after ingestion. sushi chefs who prepare fugu must be specially trained because any contamination of the toxin-free areas of the fish can be deadly. recently this toxin has been put to good use, as scientists have discovered that a purified form of it can treat severe pain in cancer patients. this recent scientific discovery would fall under which area of chemistry? applied biochemistry pure organic chemistry pure physical chemistry applied inorganic chemistry

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.