Question 5 of 14beginner💡 UnderstandShort Answer3 marks

Are the changes of water to ice and water to steam, physical or chemical? Explain.

Correct Answer

The changes of water to ice and water to steam are both physical changes.

In both cases, water changes from one state to another (liquid to solid, and liquid to gas), but no new substance is formed.

The chemical composition of water (H₂O) remains the same in all three states. Ice can melt back to water, and steam can condense back to water, showing that these changes are reversible.

Since only the physical properties like state and shape change without any new substance being formed, these are classified as physical changes.

Exercise: Let Us Enhance Our Learning | Q: 5 | (Page Page 14)
For More Understanding

Explanation

The chapter explains that physical changes are those in which only physical properties like shape, size, and state of substances change, and no new substance is formed. The chapter specifically mentions that water can exist in different states (solid, liquid, and gas) and can change from one state to another. Melting ice into water is given as an example of a reversible physical change in Table 5.2.

Solution Steps

  1. Both water to ice and water to steam are physical changes

  2. Water changes state (liquid to solid, liquid to gas) but no new substance is formed

  3. The chemical composition (H₂O) remains the same in all three states

  4. These changes are reversible - ice melts to water, steam condenses to water

  5. Only physical properties like state and shape change, confirming these are physical changes

PreviousNext