If 2 g of element x combine with 7 g of element y to form compound xy how many grams of y are needed to form compound xy2

Which best describes why nh4+ can form an ionic bond with ci-?

An experimental procedure requires a 10 ml of acid to be dissolved

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?