I did a lab in Chemistry where I cleaned a penny in sodium chloride and vinegar (not really relevant, but I thought I'd share the step anyway), put the penny in a mixture of sodium hydroxide and zinc over a bunsen burner, and let it sit for awhile. It turned silver, and when it did that, I took it out, and put it in distilled water. After a minute or so, I took it out and held it over the bunsen burner (which was turned up high) and it turned gold, and i took it out before it started to melt. Here are some questions I have:
1. did the copper change to gold? explain. (i put no, and my reasoning was "we were told that it wasn't"...i didn't actually know why it wasn't gold)
2. what intensive property could be used to prove your explanation? (i dont know this either)
3. list 1 extensive and 1 intensive property of the penny
4. the last change (meaning when i held the penny over the open flame) formed an alloy, was the last change physical or chemical?
5. did the last change form a compound, mixture, or new element? (i don't know =/)
6. what was the final product? (i think its brass but idk)
i need help figuring these out, but i would like a good explanation so im actually learning something