Runoffs from a mine have contaminated the groundwater in a location. This might cause health problems among people in the location. Which of these is the best plan to solve this problem?

Plant trees around the mine to absorb contaminated water
Collect the runoff in retention ponds lined with protective barriers
Put fences around mines to stop the flow of contaminated water
Drain local aquifer into retention ponds to store the contaminants

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.

the answers are

c and c