Question

in the statement all spontaneous changes result in an increase in entropy, the entropy change is ______.

Explanation:

To solve this, we recall the concept of entropy in thermodynamics (a part of Physics, which is a subfield of Natural Science). The second law of thermodynamics states that for a spontaneous process in an isolated system, the entropy of the system (or the universe, considering the system and surroundings) increases. In the given statement, when it says all spontaneous changes result in an increase in entropy, the entropy change here refers to the entropy change of the universe (or the isolated system). The key point is that spontaneous processes tend to increase the total entropy (system + surroundings, or for an isolated system, just the system's entropy). So the entropy change is of the universe (or the isolated system) and is positive (increase).

Answer:

the entropy change of the universe (or the isolated system) and is an increase (or positive)