Calculate the change internal energy (ÎE) for a system that is giving off 55.0 kJ of heat and is performing 655 J of work on the surroundings.

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?

How many molecules are found in 1.32 mol of nacl?

What are transitions between a liquid and gas called? identify which way they are transitioning