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The question asks: "Which statement about the physical change of liquid water boiling into steam is true?"

Looking at the options:

1. **The heat added represents an energy change.**  
   - This is **true**. When water boils and changes into steam, heat is absorbed, leading to a phase change without a chemical reaction. The heat added increases the kinetic energy of water molecules, causing them to transition into the gaseous state (steam).

2. **The weight lost represents a mass change.**  
   - This is **false**. There is no loss of mass during a physical phase change like boiling, though the apparent weight might differ if considering factors like evaporation.

3. **The steam cannot conserve mass.**  
   - This is **false**. Mass is conserved during a physical change, such as boiling. The mass of the water before boiling is equal to the mass of the steam after boiling, assuming a closed system.

4. **The action cannot be reversed.**  
   - This is **false**. The process of boiling is reversible. Steam can condense back into liquid water if cooled.

So, the correct answer is **"The heat added represents an energy change."**

Do you have any questions or would you like further details? Here are five related questions:

1. What is the difference between a physical and chemical change?
2. How does the boiling point of water change with pressure?
3. What is the specific heat capacity of water, and how is it related to phase changes?
4. Can all physical changes be reversed? Why or why not?
5. How does the conservation of mass apply to physical changes?

**Tip:** In a phase change, such as boiling, the temperature remains constant until the entire substance has changed states, even though energy continues to be added!

Which statement about the physical change of liquid water boiling into steam is true?

Explore the physical change of water boiling into steam. Understand the role of energy, the conservation of mass, and the reversibility of the boiling process in this science concept, suitable for Grades 6-8.

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