A student is investigating factors that might influence solubility. In one experiment, she places one sugar cube each into two different glasses of water at room temperature. She also places a third sugar cube into a third glass of water at a higher temperature. She notices that the cube in the water at the higher temperature dissolves more quickly. Which of the following statements was most likely the hypothesis she was testing?

Which statement correctly describes the phosphate ion, ? it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion. it is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.