Ncert Exercises & Solutions

Which among the following statements about open, closed, and isolated systems is correct?

1.	The presence of reacting species in a covered beaker represents an open system.
2.	In a closed system, there is an exchange of both energy and matter between the system and its surroundings.
3.	A system containing reactants in a closed vessel made of copper is an example of a closed system.
4.	A system containing reactants in a thermos flask or any other closed, insulated vessel is an example of a closed system.