Copper is lighter than copper oxide. This is because copper oxide is a compound formed by the combination of copper and oxygen, which increases its overall mass compared to pure copper. Therefore, in terms of weight, copper is lighter than copper oxide. **

The chemical formula for copper oxide is CuO, for copper it is Cu, and for carbon dioxide it is CO2. Copper oxide is a compound formed by the combination of copper and oxygen, while copper is an element on its own. Carbon dioxide is a compound formed by the combination of carbon and oxygen. **

To produce copper from copper oxide, you can use a process called reduction. This involves heating the copper oxide with a reducing agent such as carbon (in the form of charcoal or coke) in a furnace. The carbon will react with the oxygen in the copper oxide, leaving behind the pure copper metal. This process is known as smelting and has been used for centuries to extract copper from its ores. Once the copper metal is obtained, it can be further purified and shaped into the desired form. **

Ötzi, the ancient iceman, likely extracted copper from copper ore using a technique called smelting. This process involves heating the copper ore in a furnace at high temperatures to separate the copper from the surrounding rock and other impurities. Ötzi may have used a combination of charcoal and blowpipes to create the necessary heat for smelting. Once the copper was extracted, it could be shaped and used for making tools and weapons. This demonstrates Ötzi's advanced knowledge of metallurgy and his ability to work with metal during the Copper Age. **

No, induction current does not only work with copper. Induction current can be generated in any conductive material, not just copper. Other materials such as aluminum, iron, and gold can also conduct induction current. The key factor is the material's ability to conduct electricity, rather than being limited to copper. **

A washable copper toner works by depositing copper ions onto the surface of the hair strands. These copper ions help to neutralize unwanted tones, such as brassy or yellow tones, in the hair. The toner can be applied after bleaching or lightening the hair to achieve the desired shade of blonde or silver. It can be washed out after a few shampoos, making it a temporary solution for toning hair. **

Copper sulfate works against weeds by disrupting their cellular function and causing them to die. When applied to the soil, copper sulfate is absorbed by the roots of the weeds, where it interferes with their ability to take up essential nutrients and water. This disrupts the weed's growth and eventually leads to its death. Additionally, copper sulfate can also act as a desiccant, drying out the leaves and stems of the weeds, further contributing to their demise. **

Copper sulfate is mostly used for copper plating because it is a readily available and cost-effective source of copper ions. When dissolved in water, copper sulfate dissociates into copper ions and sulfate ions, which can then be used in the electroplating process to deposit a layer of copper onto a conductive surface. Additionally, copper sulfate is stable and easy to handle, making it a popular choice for industrial applications. **