which statement about the physical change of liquid water boiling into steam is true? the heat added…

which statement about the physical change of liquid water boiling into steam is true? the heat added represents an energy change. the action cannot be reversed. the steam cannot conserve mass. the weight lost represents a mass change.

which statement about the physical change of liquid water boiling into steam is true? the heat added represents an energy change. the action cannot be reversed. the steam cannot conserve mass. the weight lost represents a mass change.

Answer

Explanation:

Step1: Analyze energy change in boiling

When liquid water boils into steam, heat is added to break the intermolecular forces. This heat addition represents an energy - change as the water molecules gain enough energy to change from the liquid phase to the gas phase.

Step2: Analyze reversibility

The process of water boiling into steam is reversible. Steam can be cooled to condense back into liquid water.

Step3: Analyze mass conservation

According to the law of conservation of mass, in a physical change like boiling, mass is conserved. The steam still has the same mass as the water it originated from (in an isolated system).

Step4: Analyze weight - mass relationship

Weight is the force exerted on an object due to gravity ($W = mg$). In a physical change of boiling, there is no mass change in an isolated system, so the weight lost does not represent a mass change.

Answer:

The heat added represents an energy change.