Question

What happens to the mass of water in a pot when it cools, assuming no molecules escape or are added? Is this observable in practice? Explain.

a) The mass decreases; yes, this is observable.

b) The mass increases; no, this is not observable.

c) The mass remains constant; yes, this is observable.

d) The mass remains constant; no, this is not observable.

Answer 1

The mass of water in a pot remains constant when it cools, assuming no molecules escape or are added. This is observable in practice.

Step-by-step explanation:

The mass of water in a pot remains constant when it cools, assuming no molecules escape or are added. This is because mass is a measure of the amount of matter, and cooling does not cause any matter to disappear or appear. The decrease in temperature during cooling does not affect the mass of the water.

This is observable in practice because we can measure the mass of the water before and after cooling and find that it remains the same. We can use a balance or a weighing scale to measure the mass of the water and observe that it does not change when it cools.