How does the kinetic-molecular theory explain diffusion?
a. Molecules stop moving once they
escape their containers.
b. Molecules lump together when forced
into small volumes.
c. Molecules become larger when they
have room to expand.
d. Molecules in motion collide and spread
in all directions.

An ionic compound can conduct electricity when a it is dissolved in water b its crystals are ground into powder c it is in solid form d it is heated to just below its melting point

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)

During the past 150 years in the united states, how did energy consumption compare to population growth