Two different liquids are poured into a jar until it is half full. The jar is then sealed shut and shaken. The liquids undergo a chemical reaction that releases thermal energy and also emits a new gas into the far. The new gas increases the pressure inside the jar. After the far is sealed, it is an example of an)

A closed system.

Explanation:

The three major types of system are: open, closed and isolated. Open system interacts with its surroundings with respect to its particles and energy. A closed system interacts with its surroundings with respect to energy but not its particles. While an isolated system does not interact with its surroundings in any way.

Therefore, after the jar is sealed, it is an example of a closed system. This is because the emitted gas could not escape into the surroundings, but thermal energy was emitted into its surroundings after the chemical reaction has taken place.

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

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