Which of the following statements is correct?
1
The presence of reacting species in a covered beaker is an example of open system.
2
There is an exchange of energy as well as matter between the system and the surroundings in a closed system.
3
The presence of reactants in a closed vessel made up of copper is an example of a closed system.
4
The presence of reactants in a thermos flask or any other closed insulated vessel is an example of a closed system.