Question
Define a compound. Give two points of evidence to show that sodium chloride is a compound.
✓
Answer
A compound is a substance made up of two or more elements chemically combined in a fixed proportion by mass. $NaCl$ cannot be separated into its constituents by physical process and the properties of $NaCl$ is completely different from that of $Na$ and $Cl$, so $NaCl$ is a compound and not a mixture.
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