6. An enthalpy change is a. the difference in the kinetic energy of the reactants and the products in a chemical change b. the difference in the potential energy of the reactants and the products in a chemical change c. the difference in enthalpies of the reactants and the products in a chemical change d. the sum of the potential and kinetic energies of the products e. the sum of the potential and kinetic energies of the reactants

5. Why does heat transfer from object to object? Heat is energy so it moves Heat transfers because of the temperature differences between objects Heat does not transfer between objects Heat transfers because of the mass difference between objects

3. Select the INCORRECT description about heat. * 1 poir O A. Heat transfer occurs from a low temperature object to a higher temperature object. B. Heat transfer changes the internal energy of both the system and surroundings involved. C. Heat is a measure of thermal energy transferred between two bodies at different temperature D. Heat is not a state function and its values depend on the path of the process and vary accordingly 1 po 4. Select the INCORRE CT description about internal energy. chcolute internaleneray .can be measured

A gas is cooled by removing 25 kJ of heat from the gas.  As the volume decreases, the surroundings perform 3 kJ of work on the gas.  What is the change in internal energy of the gas? a. 28 kJ b. 75 kJ c. –28 kJ d. 22 kJ e. –22 kJ