Reggie and charlotte are baking oatmeal cookies. they dip the baked cookies in melted chocolate. the chocolate cools to form a hardened coating. reggie argues the entire chocolate-covered cookie has undergone a chemical change. charlotte disagrees, saying only the original oatmeal cookie has undergone a chemical change, not the chocolate coating. who is correct?

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.

The electric potential v is constant everywhere within a certain region of space. which statement below is true? the choices are: the electric field is also constant (but not zero) within the region. a charged particle placed within the region will experience an electric force. the electric field is zero everywhere within the region. the electric field varies from place to place within the region.

What type of graph used to show how a part of something relates to the whole