Question

chemistry review and reflect back to intro page identify which reaction represents endothermic and which represents exothermic. (2 points) two energy graphs: left graph has y-axis energy (kj), x-axis reaction time, reactants (higher energy) → products (lower energy) with label energy given out to the surroundings δh. right graph has y-axis energy (kj), x-axis reaction time, reactants (lower energy) → products (higher energy) with label energy taken in from the surroundings δh. both graphs have a red circle and dropdown menu.

Explanation:

Step1: Recall endothermic/exothermic definitions

Exothermic: Reactants have more energy than products (energy released, $\Delta H < 0$).
Endothermic: Products have more energy than reactants (energy absorbed, $\Delta H > 0$).

Step2: Analyze left graph

Left: Reactants energy > Products energy (energy given out). So this is exothermic.

Step3: Analyze right graph

Right: Products energy > Reactants energy (energy taken in). So this is endothermic.

Answer:

Left reaction (reactants → products with energy given out): Exothermic.
Right reaction (reactants → products with energy taken in): Endothermic.