The enthalpy change for the reaction between hydrochloric acid and sodium hydroxide is -56 kJ mol¹. Therefore
Α the reaction is exothermic and the temperature rises.
B the reaction is exothermic and the temperature falls.
C the reaction is endothermic and the temperature rises.
Ꭰ the reaction is endothermic and the temperature falls.
A the reaction is exothermic and the temperature rises.
The correct answer is C) the reaction is endothermic and the temperature rises.
Enthalpy change is a measure of the heat energy released or absorbed during a chemical reaction. A negative enthalpy change indicates that the reaction is exothermic, meaning heat is being released. Since the enthalpy change in this case is -56 kJ/mol, and exothermic reactions release heat, the answer should be either A or C.
To determine whether the temperature rises or falls, we need to consider the signs of enthalpy change and temperature change. In an exothermic reaction, heat is released, causing the surroundings (in this case, the solution) to heat up. Therefore, the temperature rises.
So, the correct answer is C) the reaction is endothermic, and the temperature rises.
To determine the correct answer, we need to understand the relationship between enthalpy change and the temperature of a reaction.
Enthalpy change (∆H) is a measure of heat energy released or absorbed during a chemical reaction. If the ∆H is negative, it means the reaction is exothermic, releasing heat to the surroundings. If the ∆H is positive, it means the reaction is endothermic, absorbing heat from the surroundings.
In this case, the enthalpy change (∆H) is -56 kJ/mol, which means it is negative. Therefore, the reaction is exothermic.
Now, let's consider the temperature change. In an exothermic reaction, heat is released, causing the temperature of the surroundings to rise. Conversely, in an endothermic reaction, heat is absorbed from the surroundings, causing the temperature to fall.
Since the reaction is exothermic (choice A), the correct answer is that the temperature rises (choice A).