Which of the following involves a reaction in which energy is absorbed?

( need answer asap)

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

Which notation is used to represent an alpha particle? a. b. c. d.

Which bonds are found inside a water molecule