Look at the diagram of a fuel cell below. which statement is true about this fuel cell? a it is self contained like a battery. b it continually needs to be charged. c it has an electrolyte that acts as a salt bridge. d it does not require the input of fuels from an outside source.

What occurs during a combustion reaction

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.

The electric field direction is defined by the direction of the force felt by (select one of the following answers): 1. a negative charge. 2. a positive charge. 3. both positive and negative charges.