Jill is studying the temperature output of an ammonium chloride hand warmer. What apparatus will best help her monitor the
temperature change of the reaction?
calorimeter
colorimeter
hydrometer
thermometer

Thermometer

Explanation:

Because a thermometer helps to measure temperatures

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.