Chloe can successfully separate a mixture of copper (II) oxide, solid iodine, and sand by utilizing the differences in their physical and chemical properties. Here's a step-by-step process she can follow:
1. Sublimation of Iodine: Since iodine sublimes (changes from solid to gas directly), Chloe can use this property to separate iodine from the mixture. She can heat the mixture gently, and the solid iodine will vaporize, leaving behind copper (II) oxide and sand.
2. Filtration: After sublimating iodine, Chloe will be left with a mixture of copper (II) oxide and sand. She can separate these two components by performing filtration. By adding water to the mixture, the sand will settle at the bottom as a solid, while copper (II) oxide will remain in suspension as a solid in the water.
3. Decantation or Filtration: Chloe can carefully pour off the water (with suspended copper (II) oxide) or perform another filtration to separate the copper (II) oxide from the water. The copper (II) oxide will be retained on the filter paper, while the water can be discarded.
By following these steps, Chloe will have successfully separated copper (II) oxide, iodine, and sand from the initial mixture. She will have obtained pure samples of each component.