copper化學問題~ plz help 20分

1. Practically, we have to recycle iron and aluminium because both of them are very demanding all around the earth. Most importantly, it helps conserver the Earth's precious resources: not only the raw materials used in the extraction of these metals, but also the energy saved.
　However, I'm sorry to say that I don't know how to answer the safest way to use and reuse metals
2. Nope. Just know that there are three kinds of extraction methods：electrolysis, chemical reduction by carbon or carbon monoxide(If the ore is a sulphide, it is roasted first to get the oxide) and roasting the ore.
3. To start with, I need to clarify what you asked. If you asked if the properties of all metals are same. I would say that they are not the same. Instead, they have similar properties due to their bonding mentioned below (question 6). If you take a look at the periodic table, half of them are metals. However, owing to the different row and column in the periodic table, they have different properties related to their structures. As you probably know, they have different electronic configurations and sizes, which affect their strenth and type of bondings. All of these factors account for their difference.
4. Copper is an essential trace nutrient to all high plants and animals. In animals, including humans, it is found primarily in the bloodstream, as a co-factor in various enzymes, and in copper-based pigments. In a nutshell, we can't exist without copper which is vital to your life with trace amount. In addition, since all coins are made of copper and its alloy, they cannot exist without copper.
5. It is used extensively, in products such as:

Electronics

Copper wire.
Electromagnets.
Printed circuit boards.
Lead free solder, alloyed with tin.
Electrical machines, especially electromagnetic motors, generators and transformers.
Electrical relays, electrical busbars and electrical switches.
Vacuum tubes, cathode ray tubes, and the magnetrons in microwave ovens.
Wave guides for microwave radiation.
Integrated circuits, increasingly replacing aluminium because of its superior electrical conductivity.
As a material in the manufacture of computer heat sinks, as a result of its superior heat dissipation capacity to aluminium.
Copper roof on the Minneapolis City Hall, coated with Patina

Architecture
Copper has been used as water-proof roofing material since ancient times, giving many old buildings their greenish roofs and domes. Initially copper oxide forms, replaced by cuprous and cupric sulfide, and finally by copper sulfate. The final sulfate patina is highly resistant to corrosion.[5]
Statuary: The Statue of Liberty, for example, contains 179,220 pounds (81.3 tonnes) of copper.
Alloyed with nickel, e.g. cupronickel and Monel, used as corrosive assistant materials in shipbuilding.
Watt's steam engine.
Old copper utensils in a Jerusalem restaurant

Household Products
Copper plumbing fittings and compression tubes.
Doorknobs and other fixtures in houses.
Roofing, guttering, and rainspouts on buildings.
In cookware, such as frying pans.
Most flatware (knives, forks, spoons) contains some copper (nickel silver).
Sterling silver, if it is to be used in dinnerware, must contain a few percent copper.
Copper water heating cylinders

Coinage

As a component of coins, often as cupronickel alloy.
Coins in the following countries all contain copper: European Union (Euro
United States,UnitedKingdom (sterling),Australia and New Zealand.
Ironically, U.S. Nickels are 75.0% copper by weight and only 25.0% nickel.