Wich of the following quantities is not a vector

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.

Give an example in which the electrical energy changes to light energy

Which is a substance that can be separated by physical means and is not the same throughout