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Sodium reacts with chlorine gas to produce sodium chloride. Is this an example of a chemical or physical change? How do you know?

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No its a physical change .

  • when we put NaCl in water it takes Lattice energy as its a ionic compound and breaks down


\\ \sf\longmapsto NaCl+Lattice\:Energy\longrightarrow Na^++Cl^-+Hydration\:Energy

User Mukesh Tiwari
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