Answer:
Exothermic and endothermic
Explanation:
- Enthalpy change of a reaction refers to the energy change between the reactants and the products.
- it is given by:
Enthalpy change = Energy of products - energy of reactants
- Exothermic reactions are reactions that release heat energy to the surroundings.
- Due to the energy output to the surrounding the energy of reactants will be greater than that of the product, therefore, the reaction will have a negative enthalpy change.
- Endothermic reactions,on the other hand, are reactions that require additional heat energy from the surrounding.
- Therefore, the energy of the products will be greater than that of the reactants due to energy input from the environment and thus the enthalpy change will be positive.
