8. Thermochemistry

The heat of vaporization of water at 100°C is 40.66 kJ/mol. Calculate the quantity of heat that is absorbed or released when 20.00 g of steam condenses to liquid water at 100°C.

When heat is removed from a substance, which of the following is most likely to occur?

Which of the following reactions is exothermic?

Which one of the following chemical equations represents an exothermic reaction?

Which of the following is true for all reversible exothermic processes?

In thermochemistry, what can be concluded about a reaction with a negative enthalpy change $\Delta H<0$?

Which type of reaction releases energy to the surroundings?

Which of the following energy profile diagrams best represents an exothermic reaction?

During an endothermic reaction, what typically happens to the temperature of the surroundings?

Which of the following is a similarity between the energy profiles of exothermic and endothermic reactions?

Which of the following phase changes is endothermic?

Jan is holding an ice cube. What causes the ice to melt?

Which of the following physical changes is endothermic?

A reaction which is endothermic and has an overall increase in entropy is:

In an exothermic reaction, what happens to energy?