which of the following statement is correct?
The presence of reacting species in a covered beaker is an example of open system
There is an exchange of energy as well as matter between the system and the surroundings in closed system
The presence of reactants in a closed vessel made up of copper is an example of a closed system
The presence of reactants in a thermos flask or any other closed insulated vessel in an example of a closed system
No exchange of heat and matter.