If 2 grams of element x combine with 4 grams of element y to form compound xy, how much element y would combine with 14 grams of x to form the same compound?

What does the term discrediting mean?

If steel is more dense that lake water, why can a boat float

Astudent creates a model of a closed ecosystem by filling a glass tank half full with water, then adding 10 snails and two small aquatic plants. the next day, all the snails are dead. what is the most likely cause of their death?