Sulfur, Oxygen, water, and sodium chloride are all examples of pure substances. Pure substances are different than mixtures in many ways. Which of the following describes all pure substances versus a mixture?

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.