The energy profile of an endothermic reaction shows:

Patricia is studying the energy involved in bond breaking and forming. She knows that breaking a bond requires energy and forming a bond releases energy. In an exothermic reaction, which is true?

Sam is studying thermochemical reactions. He knows that thermochemical equations include the enthalpy change. Which of the following is a thermochemical equation?

Burning of fuel is an example of:

Which energy change is shown by ΔH > 0?

Patricia is studying the difference between exothermic and endothermic reactions. She knows that the enthalpy change is negative for exothermic and positive for endothermic. Which of the following has a positive ΔH?

Xia is studying bond dissociation energy. She knows that the H-H bond has a dissociation energy of 436 kJ/mol. What does this mean?

Chloe is studying the system and surroundings. She knows that in an exothermic reaction, heat flows from the system to the surroundings. What is the sign of q (heat) for the system?

Which type of reaction absorbs heat?

Which statement is true for exothermic reactions?