What is true about the energy involved in a chemical reaction?

Between 2014 and 2016, more than 25,000 children in flint, michigan, drank water that was contaminated with lead from lead pipes. during this time, the city claimed the water was safe to drink. which of these actions could the city have taken to ensure that the drinking water was free from lead?

State one important difference between a physical change and a chemical change?

Amatch has about 21 milligrams of red phosphorus coating the tip. how many atoms of phosphorus is this?