Why did humans use bronze first, then aluminum, and finally iron?

Well, I'm a sophomore in high school, and I really forgot what I talked about in the third year of junior high school. However, humans used iron much earlier than aluminum, so you probably made a mistake......

Human beings first used copper because there was no such advanced metallurgical technology at that time, copper was more stable than iron (that is, it is not easy to rust when put in the air), so at that time people found ready-made materials: copper, iron ore and bauxite, they first found that copper was very useful, and began to forge bronze vessels, because pure iron ore (meteorite iron) was very little at that time, so there were very few iron tools at that time, but later copper was used too much, and it was difficult to find, so the great blacksmiths mixed charcoal and iron ore and extracted iron by smelting, and iron ore is very abundant on the earth, and there is a lot of charcoal, so everyone thinks that iron is more trouble-free than copper, so they start to use ironware. The use of aluminum is in modern times, Western chemists from the periodic table one by one to pick out the elements of aluminum, to cut out the aluminum, found that it is very rust-resistant (in fact, the embroidery of aluminum can just isolate the air, prevent the deep aluminum rust, iron can not work) before it began to use, and modern studies have shown that the intake of aluminum is too high can cause Alzheimer's disease, so everyone began to use iron pots to cook again, but the current application of aluminum is still very widespread.

I don't know much, that's all, I hope it can help you!

The knowledge of the 2012 version of the people's education version is yes.

The reason is: aluminum is more active than iron, and iron is more active than copper, so the difficulty of smelting them is: aluminum, iron, copper.

The previous smelting technology was too limited.

If it helps you, please be in time, your satisfaction, my infinite motivation, thank you for your cooperation (*

Your question seems incorrect, humans use bronze first, then iron, and finally aluminum. The reason is that copper is easy to smelt and does not rust easily, while iron and aluminum are more difficult to smelt. The order in which metals are used is related to their liveliness, and in order to obtain active metals, more advanced smelting techniques are required, so copper is the first, then iron, and aluminum are all smelted after people have found a lower melting point of oxides.

First copper, then iron, and finally aluminum Copper has color and chemical properties are more stable Iron is more active than copper But but not as active as aluminum Aluminum is easy to react with oxygen in the air to form alumina Its chemical properties are relatively active So it was discovered late and naturally used late.

Because there is a natural element of copper, there is no natural iron.

Moreover, the melting point of Tong is lower than that of iron, which is easy to smelt.

According to the activity of the metal, it can be seen that Al is greater than Fe and greater than Cu, so it can be known that the less active it is, the less likely it is to appear in the chemical state, and the earlier it can be used.

Aluminum is more active than iron, iron is more active than copper, and the lively type is easy to find.

(1) Metals with weak activity are not easy to undergo chemical reactions, can exist in elemental form, and are relatively easy to smelt, so the order in which humans use metals is exactly the opposite of the activity of metals, so the order in which humans begin to use these three metals is copper, iron, and aluminum; Therefore, the answer is: copper, iron and aluminum;

2) Among these three kinds of metal products, iron products that need to be paid the most attention to prevent metal corrosion when using are iron products, because the activity of iron is strong and the activity of copper is poor; Although the activity of aluminum is strong, a dense alumina film is easy to form on the surface of aluminum products to protect aluminum products from further oxidation, so the answer is: iron;

3) The hardness of alloy is greater than that of pure metal, and the hardness of bronze is much greater than that of pure copper; So the answer is: big;

4) The reason why Bordeaux liquid cannot be contained in iron is that iron can replace copper from copper sulfate solution, and its chemical equation is: Fe+CuSo4 FeSo4+Cu, so the answer is: Fe+CuSo4 FeSo4+Cu

The reason why humans first used copper, then aluminum, and finally iron:

1. Mobility by metal.

The relationship between strength and weakness and the sequence of human use of metals shows that the metals used earlier by humans have weaker activity.

2. The stronger the activity of the metal, the more difficult it is to smelt the metal, which affects the use of metal by human beings;

3. The smelting technology of copper is simpler than that of aluminum, and aluminum is smelted by electrolysis, and there is no way to obtain aluminum without electricity in ancient times. The more reactive the metal, the harder it is to smelt. Aluminum and copper are much more lively.

1) Metals with weak activity are not easy to undergo chemical reactions, can exist in elemental form, and are relatively easy to smelt, so the order in which humans use metals is exactly the opposite of the activity of metals, so the order in which humans begin to use these three metals is.

cu、fe、al；

2) The metal in front will replace the metal in the back from its salt solution, so the ferrous sulfate solution can be used to react with aluminum, but not with copper to compare the activity of the three metals;

3) Pig iron and steel are both alloys of iron, and the fundamental difference is that the carbon content is different, which determines their different properties; The performance of the alloy is better than that of pure metal, so the hardness of ferroalloy is greater than that of pure iron;

4) Carbon monoxide and iron oxide react to form iron and carbon dioxide, and the equation of the reaction is: 3CO+FE2O3

High temperature 2Fe+3CO2

So the answer is (1) copper, iron, aluminum (or Cu, Fe, Al).

2）b；Fe+CuSo4=FeSo4+Cu (or 2Al+3CuSo4=Al2(SO4)3+3Cu).

3) carbon content; Large (4)3CO+Fe2O3

High temperature 2Fe+3CO2

1) Metals with weak activity are not easy to undergo chemical reactions, can exist in elemental form, and are relatively easy to smelt, so the order in which humans use metals is exactly the opposite of the activity of metals, so the order in which humans begin to use these three metals is Cu, Fe, and Al;

2) The metal in front will replace the metal in the back from its salt solution, so the ferrous sulfate solution can be used to react with aluminum, but not with copper to compare the activity of the three metals;

3) Pig iron and steel are both alloys of iron, and the fundamental difference is that the carbon content is different, which determines their different properties; The performance of the alloy is better than that of pure metal, so the hardness of ferroalloy is greater than that of pure iron;

4) Carbon monoxide and iron oxide react to form iron and carbon dioxide, and the equation of the reaction is: 3CO+Fe2O3 high temperature.

2fe+3co2

So the answer is (1) copper, iron, aluminum (or Cu, Fe, Al).

2）b； fe+cuso4

Feso4Cu (or 2Al+3CuSO4

al2so4

3cu) 3) carbon content; Large (4) 3CO+Fe2O3 high temperature.

2fe+3co2

1) Metals with weak activity are not easy to undergo chemical reactions.

Elemental. The form exists, and it is relatively easy to smelt, so the order in which humans use metals is exactly the opposite of the activity of metals, so the order in which humans begin to use these three metals is.

cu、fe、al；

2) The metal in front will remove the metal in the back.

Saline solution. so it can be used.

Ferrous sulfate solution.

It can react with aluminum, but not with copper, and the activity of the three metals can be compared;

3) Pig iron and steel are both alloys of iron, and the fundamental difference is that the carbon content is different, which determines their different properties; The properties of alloys are better than those of pure metals, therefore.

Ferroalloy. Compare.

Pure iron. The hardness is large;

4) Carbon monoxide and.

Iron oxide. The reaction is destroyed to form iron and carbon dioxide, and the equation of the reaction is: 3CO+Fe2O3 high temperature.

2fe+3co2

So the answer is (1) copper, iron, aluminum (or Cu, Fe, Al) 2) b; fe+

CuSO4FeSO4+CU (or 2AL+3CUSO4=AL2(SO4)3+3Cu).

3) carbon content; (4) 3CO+Fe2O3, high temperature 2Fe+3CO2

It must be early copper, and the bronze artifacts unearthed at present are from the Shang Dynasty; In terms of ironware, some experts believe that there may have been a quarrel in the iron-smelting industry in the Western Zhou Dynasty. Because "Ban Jin Shiyin" when he was the king of Chengzi Qing Dynasty has the sentence "The king ordered Mao Gong to use Bang Mound Jun, Tu Yu, and people to fight the Eastern Kingdom Rong", and the "people" in it may be iron-smelting workers, indicating that the Western Zhou Dynasty already had a special iron-smelting industry and slaves. And it is believed that iron has become a common thing in the Western Zhou Dynasty.

There are words and phrases in the Book of Poetry, Qin Feng, and Si Yu, which is called "驖" because the horse is like iron, and there are also those who write "驖" as "iron". It was only after iron became a common thing that people called something else by its color. This is also an explanation of the origin time of iron smelting in ancient China.

However, in the underground excavations, no iron tools from the Western Zhou Dynasty have been found so far.

The replacement of copper salts with iron should at least be a matter after the Western Zhou Dynasty.

I think that iron is not easy to preserve, it is easier to oxidize, and iron is difficult to preserve until now, all in the large self-environment iron is easier to oxidize than copper