Which statement best describes an effect of using a catalyst in an industrial process?
it lowers energy requirements.
it increases waste.
it increases toxic exhaust.
it lowers production rates.

Option (a) is the correct answer.

Explanation:

Catalyst are the species or substances which helps in increasing the rate of a reaction without itself getting consumed in the reaction.

A catalyst lowers the activation energy so that molecules with low energy can easily participate in the chemical reaction and hence product formation becomes faster.

Thus, we can conclude that the statement it lowers energy requirements  best describes an effect of using a catalyst in an industrial process.  

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me