Question

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?
A. It is an exothermic process
B. It is an endothermic process
C. The chemicals absorb heat from the surrounding
D. None of the above

Answer 1

Answer:

C

Explanation:

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Answer 2

C. The chemicals absorb heat from the surrounding

Exothermic reactions are those in which energy is released, generally in the form of heat or light. Because the total energy of the products is less than the total energy of the reactants, energy is released in an exothermic reaction. As a result, for an exothermic process, the change in enthalpy, H, will always be negative. A strong acid will dissociate fast and produce heat in the presence of water, resulting in an exothermic reaction.

Reaction that is exothermic

The total energy of the products in an exothermic reaction is less than the total energy of the reactants. As a result, the enthalpy change is negative, and heat is discharged into the environment.