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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.
The mass in a chemical reaction is constant in a closed system. However, if a chemical reaction is completed in an open system, mass changes may occur. These mass changes allow scientists to monitor rates of reaction (the rate of production of a product or rate of use of reactant).ut, if the chemical reaction happens in an open system (where air can get in and out), then mass may appear to change. In this simulation we will explore the mass changes in chemical reactions and endeavour to explain why they have occurred.