The white Dwarfs are a group of stars that are- A.) Average in brightness but high in temperature

B.) Average in brightness and average in temperature

C.) Low in brightness but are average to high in temperature

D.) Extremely bright and hot

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?

answer seismograph;

i think tornado but not 100%