Properties of Matter — Test

Question 23 • Physical Science

Based on the above description of transpiration and photosynthesis, which type of change happens to water during each process?

Answer

In transpiration, because some of its properties change, water undergoes a physical change but keeps its identity. In photosynthesis, because its identity changes, water undergoes a chemical change.

In transpiration, because its physical properties change, water undergoes a physical change and loses its identity. In photosynthesis, because it keeps its identity, water undergoes a chemical change.

In transpiration, because its chemical properties change, water undergoes a chemical change and loses its identity. In photosynthesis, because it keeps its identity, water undergoes a physical change.

In transpiration, because some of its properties change, water undergoes a chemical change but keeps its identity. In photosynthesis, because its identity changes, water undergoes a physical change.

Explanation

In transpiration, water evaporates from the plant and moves as water vapor. Its state changes, but it remains H₂O, so this is a physical change and water keeps its identity. In photosynthesis, water molecules are used in reactions that produce different substances, so water’s identity changes in a chemical change. Choice C describes both processes correctly.

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