Question

How is an endothermic reaction identified

Answer 1

An endothermic reaction absorbs heat from its surroundings.

Step-by-step explanation:

An example is the reaction of acetic acid with baking soda.

Three ways to tell if a reaction is endothermic:

1. Do the experiment. The system cools down, and you can use a thermometer or your hand to tell that the flask becomes colder .
2. Heat will appear as a reactant in the chemical equation:CH₃COOH + NaHCO₃ + heat ⟶ CH₃COONa + H₂O + CO₂
3. The sign of ΔH is positive. N₂ + 2O₂ ⟶ 2NO₂ ; ΔH = +33.1 kJ·mol⁻¹

Answer 2

An endothermic reaction is identified by noting the drop in temperature in the system.

Step-by-step explanation:

An endothermic reaction occurs by absorbing heat energy from the environment( apparatus and solution). Once the energy in the surrounding reduces the temperature drops. The energy absorbed is used to form new bonds. The energy absorbed is directly proportional to the temperature drop.