Please look at the photo and give me the answer :)))

A248-g piece of copper is dropped into 390 ml of water at 22.6 °c. the final temperature of the water was measured as 39.9 °c. calculate the initial temperature of the piece of copper. assume that all heat transfer occurs between the copper and the water. remember, the density of water is 1.0 g/m

If you put a helium-filled balloon in the refrigerator, what will happen?

Which statement best explains why the overall charge on an atom is zero?