Question

1. why is it easier to observe the law of conservation of mass in a closed system than in an open system?

Explanation:

In a closed system, matter can't enter/exit. In an open system, matter (like gases, reactants/products) can escape or be added, altering mass measurements. So closed systems preserve mass for observation.

Answer:

In a closed system, matter cannot enter or leave, so the total mass remains constant and is easy to measure. In an open system, matter (e.g., gases, reactants/products) can escape or be added, changing the measured mass, making it harder to observe mass conservation.