What happens when the water sand mixture is poured through a filter?

Which common material is an example of a polymer? (25 pts) a. steel b. plastic c. petroleum d. rubbing alcohol

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Calculate the energy required to ionize a hydrogen atom to an excited state where the electron is initially in the n = 5 energy level. report your answer in kilojoules