What makes a compound a pure substance ​

Compounds contain more than one type of material. Yet both compounds and elements are considered pure substances. 

Pure compounds are created when elements combine permanently, forming one substance

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So, a mixture can be separated into its original components, while a pure compound cannot.

pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

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idk i’m struggling too