Which of the following are exothermic? Select all correct answers.
A.The energy of the products is less than the energy of the reactants.
B. Heat flows from the system to the surroundings.
C. If the reaction is done in a coffee-cup calorimeter, the temperature of the solution will fall.
D. Delta H < 0
I think it is A, B, and D
I agree
You are correct! The correct answers for this question are A, B, and D.
Let me explain why these options are correct:
A. "The energy of the products is less than the energy of the reactants" refers to an exothermic reaction. In an exothermic reaction, the energy released by the reaction is greater than the energy required to break the bonds of the reactants. This means that the energy of the products is lower than the energy of the reactants, making option A correct.
B. "Heat flows from the system to the surroundings" is also a characteristic of an exothermic reaction. Exothermic reactions release heat energy, causing the temperature of the system to increase and heat to flow from the system to the surroundings. Therefore, option B is correct.
C. However, the statement "If the reaction is done in a coffee-cup calorimeter, the temperature of the solution will fall" is incorrect for exothermic reactions. In an exothermic reaction, the temperature of the reaction mixture increases due to the release of heat energy. Therefore, option C is incorrect.
D. "Delta H < 0" refers to the change in enthalpy during a reaction. Enthalpy is a measure of the heat energy absorbed or released in a reaction. A negative value for Delta H indicates that the reaction is exothermic, as it means heat is being released. Therefore, option D is correct.
To summarize, options A, B, and D are correct because they describe characteristics of exothermic reactions.