Is adding hydrochloric acid to milk a physical or chemical change?

If the particles in a sample of matter have an orderly arrangement and move only in place, the sample is a

Water (2510 g ) is heated until it just begins to boil. if the water absorbs 5.09×105 j of heat in the process, what was the initial temperature of the water?

Find the mass in grams of 1.37x1020 particles of h3po4