A sealed, vacuum-insulated reaction flask approximates what condition, in which neither matter nor heat can be exchanged between system and surroundings?
sure system
shared system
changing system
isolated system
Depending on the specific setup, a few different types of systems can be described. In an open system , both matter and heat can be freely exchanged between the reaction container (the system) and the surroundings. An example would be an open beaker, where any gaseous materials or vaporized molecules are free to leave the system and float off into the atmosphere. In a closed system , matter cannot enter or leave, but heat can flow between the system and surroundings. A stoppered reaction flask would be an example of a closed system. Finally, a situation in which neither matter nor heat can be exchanged between system and surroundings is referred to as an isolated system . Although truly isolated systems are not really possible, a sealed, vacuum-insulated reaction flask would come very close.