In an endothermic physical or chemical change,.

a)the potential energy of the system increases
b)all of these
c)the system absorbs heat from its surroundings
d)kinetic energy is converted into potential energy and seems to disappear

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?

Which type of intermolecular attractions holds ammonia molecules together with other ammonia molecules?

Select the correct answer. why are scientific models important in the study of science? a. they always involve critical mathematical calculations. b. they scientists understand complex ideas and objects that aren’t easy to handle. c. they enable scientists to popularize their work in society. d. they are required when conducting any peer review process. e. they are necessary for turning a hypothesis into a law.