After the discovery of copper working and before the discovery of bronze, the History channel said that copper was used to make tools and decorations. They showed a lot of copper decorations, but no tools. So, what tools DID early man make from copper? Could they make swords, even if they had to be sharpened often? Could they make axes? Hammers? What tools could they make? P.S. It was hard to decide what topic to put this question in.

I spent a lot of dough on a beautiful bird feeder with a copper top on it. However, it quickly started looking shabby with bird dropping stains that I can't get out. I don't mind a patina as the copper ages, but the bird dropping stains are simply ugly. I'm considering getting another copper-topped feeder as a mother's day gift, but not if it's going to look ugly after only a few months. Is there any way to protect the copper from staining? A coat of oil or something?

I preformed an experiment in chemistry in which we placed a piece of copper into HCL and left it there for a week. When I went back to look at the experiment, the copper had been oxidized. What caused this? And what is the chemical equation? I know that hydrogen will not oxidize copper due to their placement on the activity series. Thank you for your help.

I'm trying to purify copper by running a direct current through a copper sulfate solution. I've been trying it at 6 volts, but this results in a brown sludge being deposited at the cathode, instead of metallic copper. Does anybody know what voltage is normally used for this operation?

The top is clean except for a copper semi-circle left from melted copper from the pan. Is there an effective way to remove the copper residue?

I am doing a plumbing repair, and on the Grainger website I can get the supplies I need in copper and wrot copper. I just want to make sure, before I purchase the wrot copper, that it works just as well as regular copper, and can be sweat just like regular copper. Is there any difference between the 2 that I need to know?

I just replaced the copper wiring in my home and have about 30 feet left over , how much should I get by going to a recycling company or scrap yard ?????????

Copper will react with sulfur to form a copper sulfide. If 1.500g copper reacts with sulfur to form 1.880g of copper sulfide, what is the empirical formula of the copper sulfide?

I think this would look awesome since it would match the bronze drawer pulls. I have heard that the patina can be toxic. Or is just drinking from copper pipes that is bad? Advice please.

Hi, How much copper can you get from 10g of copper carbonate? Also, what are the methods to extract the copper from the copper carbonate? I think I know a method, which is to heat the copper carbonate to get copper oxide, and then use a reducing agent to take the oxygen away. Any others? Also, confirming my method will be a great help. Thanks buds. All :- Thanks for your help :D.