Question

Select all that apply.

When the products of a reaction are hotter than the reactants _____.

A.) The reaction is exothermic.
B.) The reaction is endothermic.
C.) The reactants lost internal energy.
D.) The change in enthalpy is positive.

Answer 1

Answer: Option (A) and (C) are correct answers.

Step-by-step explanation:

When reactants combine and release energy in the form of heat then this type of reaction is known as exothermic reaction.

Internal energy is the energy within an object or molecule due to motio of its atoms.

During exothermic reaction, products become hotter and also there is loss of internal energy of reactants as heat is released.

Answer 2

I think the correct answer from the choices listed above is option 2. When the products of a reaction are hotter than the reactants the reaction is endothermic. The change in temperature is a measure of energy difference of the states. Since energy must be conserved, so there must be a source of energy for the system.