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Which one of the following statements is not correct?

A. Sodium and chlorine are elements
B. Sodium chloride is a compound
C. Sodium chloride is a pure substance
D. NaCl is a heterogeneous mixture
E. NaCl added to water forms a pure solution

1 Answer

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Final answer:

D. NaCl is a heterogeneous mixture. The incorrect statement in the provided list is 'NaCl is a heterogeneous mixture,' as sodium chloride (NaCl) is a homogenous, crystalline compound, not a mixture.

Step-by-step explanation:

The student has presented a set of statements regarding sodium, chlorine, and sodium chloride, with the task of identifying which statement is not correct. Analyzing the given options, we find that:

  • Sodium and chlorine are elements,
  • Sodium chloride is a compound,
  • Sodium chloride is a pure substance,
  • NaCl is a heterogeneous mixture - This statement is incorrect as NaCl (sodium chloride) is not a heterogeneous mixture but is instead a homogeneous substance that forms a crystalline structure.
  • NaCl added to water forms a pure solution.

NaCl is a compound formed from sodium and chlorine, and it has distinct properties different from its constituent elements. It forms ionic bonds between sodium cations and chloride anions, resulting in a stable crystalline lattice that is uniform throughout, making it a homogeneous substance. Therefore, the incorrect statement among the options given is that 'NaCl is a heterogeneous mixture'.

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