States of matter

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Question 29
Easy

Solid carbon dioxide (dry ice) sublimates directly into carbon dioxide gas at room temperature, as illustrated in Figure 1.

Diagram showing the sublimation of solid carbon dioxide. On the left, a beaker contains a solid block of dry ice with a magnified view of tightly packed, neatly arranged carbon dioxide molecules. An arrow labeled 'sublimation' points to the right, showing carbon dioxide gas escaping the beaker, with a magnified view of widely separated carbon dioxide molecules moving rapidly and randomly. The chemical identity of the molecules (CO2) remains unchanged throughout.

This sublimation is a physical change.

Explain why sublimation is classified as a physical change rather than a chemical change.

[2]

States of matter Questions

  1. GCSE
  2. /Chemistry
  3. /States of matter