Explain why understanding of the terms system and surroundings is important when describing energy changes in a chemical reaction or physical process

Substance x has a fixed volume, and the attraction between its particles is strong .substance y had widely spread out particles and can be compressed what can most likely be concluded about these substances

Name the element in group 17, period 2. (periodic table)

When a nucleus absorbs a neutron and then breaks apart, there are many products of the reaction. what is not a product of a nuclear fission reaction