What is the primary purpose of adding a specific chemical to a liquid pollutant in the cleanup process described?

To change the pollutant into a solid

To evaporate the pollutant into the air

To make the pollutant invisible

What is the main practical advantage of transforming a dissolved pollutant into solid clumps?

The solid form is easier to physically collect and remove from the liquid.

The solid clumps are often valuable and can be sold for a profit.

The solid form is always completely non-toxic and safe to leave in the environment.

The chemical reaction that forms the solid also purifies the water of all impurities.

To convert the substance into a harmless gas.

To react the substance to form a harmless compound.

To use a chemical that makes the pollutant's atoms vanish.

To cause the substance to precipitate into a solid for removal.

The process is too expensive to fully eliminate the materials.

The materials are only changed into a different form, as matter cannot be destroyed.

The chemicals used for cleanup add more material, increasing the total volume.

The materials are transformed into pure energy, which is still present.