1, meaning: it is a high melting point metal, light gray. It looks like steel, with a density of 6.49g/cm3, a melting point of1852 2℃ and a boiling point of 4377℃. The surface of zirconium is easy to form a shiny oxide film. Chemically, zirconium is inert and relatively stable in air. When heated, the surface forms an oxide film and loses its metallic luster.
2. Features: High density. The density of zirconium is 6.49 g/cm3 or 6.506 g/cm3 at 20℃. High corrosion resistance, stable oxide film can be formed on the surface of zirconium, which makes it have excellent corrosion resistance. Zirconium is soluble in certain acids, hydrofluoric acid and aqua regia.
3. Properties: Chemically, it is easy to form an oxide film on the surface of zirconium, which has corrosion resistance and is soluble in hydrofluoric acid and aqua regia. When exposed to high temperature, zirconium can react with nonmetallic elements and many metallic elements to form solid solution compounds.
Methods of explaining the meaning of words
1. Split-and-splice method: take words apart, explain each word first, and then splice the meaning of each word to express the meaning of the word. For example, explain the word train. Fire refers to a burning flame. A car refers to a means of transportation. A train is a means of transportation that uses burning flames as its power source.
2. Synonyms: Use words with the same or similar meanings to explain words. For example, explain the word beauty. Beauty refers to a good appearance or image. Gracefulness means that the appearance or sound is aesthetic. Explain the meaning with synonyms: beauty refers to beautiful appearance or image.
3. Contact context: If it is a word in a sentence, it should be understood according to the principle that words and sentences are inseparable, and the correct explanation can be found by contacting the upper and lower words. Xiaoming plays football in the park. Xiao Ming mentioned above is in the park, which means that this action takes place in the park. The following refers to football, indicating that the object of this action is football.
4. Understanding with real life: Some words are closely related to our lives, and it is a good way to understand words with the help of life experience. For example, explain the word apple and understand that apple is a kind of fruit, which is generally round or oval. Understanding: Apples are common fruits in our daily life and can be eaten directly as food.