183000 yuan/ton. Tin is a metallic element with silvery white luster and low melting point. It is divalent or tetravalent in compounds and will not be oxidized by air. It mainly exists in the form of dioxide (cassiterite) and various sulfides (such as cassiterite). Element symbol Sn. Tin is a famous "hardware"-one of gold, silver, copper, iron and tin. As early as ancient times, people discovered and used tin. In some ancient tombs in China, tin pots, tin candlesticks and other tin utensils are often excavated. According to research, during the Zhou Dynasty in China, the use of tin ware was very common. Tin daily necessities were also found in ancient tombs in Egypt.

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1, melting point of tin

The element symbol Sn of tin at 23 1.89℃ is a metal element, inorganic, with atomic number 50 and atomic weight 1 18.75438+0. White tin is usually a low melting point metal with silvery white luster. Tin is a soft metal with low melting point and strong plasticity.

2. What metal can tin be soldered with?

Not all materials can be connected by welding. Only some metals with good weldability (strictly speaking, they should be weldable) can be connected by soldering. Generally, copper and its alloys, such as gold, silver, zinc and nickel, have good weldability, while aluminum, stainless steel and cast iron have poor weldability, so special flux and method are generally needed for welding.

3. Does tin conduct electricity?

Solder is an alloy, and its main components are tin (melting point 232 degrees) and lead (melting point 327 degrees). Among them, the solder composed of 63% tin and 37% lead is called eutectic solder, and its melting point is 183 degrees. Tin and lead are both conductor materials, and their alloys are of course conductors. In addition, solder has good conductivity and is indispensable in the welding of electronic circuits.

4. How to distinguish lead from tin?

① Different colors, tin is a silvery soft metal, and lead is a blue-white heavy metal. The following pictures show lead and tin respectively:

② Under different densities, the density of lead is 1 1.3437 g/cm3, and that of tin is 7.28 g/cm3. The density of lead is higher than that of tin.

③ Different melting points. The melting point of lead is 327.502℃, and that of tin is 2365438 0.89℃. Lead has a higher melting point than tin.

④ Different boiling points: the boiling point of lead is 1740℃, and the boiling point of tin is 2260℃, which is higher than that of lead.

5. Is tin poisonous?

Under normal circumstances, tin is not toxic, and in extreme cases, it can be said that tin is toxic. Just like salt, moderate amount is nontoxic and harmless, but Bai Yang, a white-haired girl, always drinks bittern to death, so tin should not be classified as toxic.