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Answer: An open system can exchange both matter and energy with the surroundings. Î´ H is measured when an open system is used as a calorimeter. A closed system has a fixed amount of matter, but it can exchange energy with the surroundings.
LD Chemistry Leaflets 2 In this automated version of the blue bottle experiment, a so-called two-point control system is used. Here, two states are defined in which the system automatically performs a change. State 1 is the colourless liquid, and when this occurs the pump is switched on to pump air into the solution.