Question

students are testing two chemical reactions to see whether they release or absorb thermal energy. they test each reaction by measuring how it affects the temperature of 200 grams of water. the table below shows their results. which statement below the table best explains the results for the two reactions? reaction 1 releases thermal energy and reaction 2 absorbs thermal energy reaction 2 releases thermal energy and reaction 1 absorbs thermal energy reaction 1 absorbs more thermal energy than reaction 2 reaction 2 releases more thermal energy than reaction 1

Explanation:

• For Reaction 1: The temperature of water increased from \(22^{\circ}C\) to \(43^{\circ}C\). When a chemical reaction releases thermal energy (exothermic reaction), the surrounding (in this case, water) absorbs the heat and its temperature rises.
• For Reaction 2: The temperature of water decreased from \(22^{\circ}C\) to \(14^{\circ}C\). When a chemical reaction absorbs thermal energy (endothermic reaction), it takes heat from the surrounding (water), causing the water's temperature to fall.

Answer:

Reaction 1 releases thermal energy and Reaction 2 absorbs thermal energy.