How would you use the index of refraction of salt water to find the concentration of a salt solution?

Lets say that an object of a certain volume has a certin mass. what happens to its mass when you double its volume?

Which of the following elements is in the same period as phosphorus? a. carbon c. nitrogen b. magnesium d. oxygen select the best answer from the choices provided a b c d

If 2 moles of co_2 at 2l and 500k are expanded reversibly to 20l, more work can be obtained from an adiabatic process than from an isothermal process. is the above statement true or false?