Compare the properties of sodium chloride and sand

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

Which atomic model was proposed as a result of j. j. thomson’s work?

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.