Your friend says," Chemical changes are caused by an input in energy. In physical changes, there is no transfer of energy." Is your friend correct? Why or Why not?

Calculate the molarity of each of the following solutions. part a) 0.12 mol of lino3 in 5.5 l of solution part b) 60.7 g c2h6o in 2.48 l of solution part c) 14.2 mg ki in 100 ml of solution

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

What is the approximate vapor pressure when the gas condenses at 70 degrees celsius