Question

please answer this question quickly!!!- identify the reasons (i)Graphite is used as crucibles (ii) Diamond is used to cut glass. (iii) Space shuttles, satellites are coated with a thin layer of gold. (iv) Silver compounds are used in photographic paper.

Answer 1

1. A graphite crucible is a container typically used for melting non-ferrous — or non-iron — metals such as gold, silver, aluminum or brass. Graphite, a form of carbon, is often used for crucibles because of its high temperature resistance and low reactivity with molten metals. A graphite crucible typically is made of graphite and clay that is shaped and fired to very high temperatures to form a solid container.
2. Diamonds are the hardest known substance having hardness set to 10, while glass which are used on windows have a hardness of 5.5. What this means is that any material which has hardness within a range from 5.5 to 10 can be used to cut glass. And diamonds being the hardest substance can precisely and accurately cut glass in any desired shape or form.
3. i dont no third answer
4. The light sensitive silver halides, silver chloride, silver bromide and silver iodide, are used to make photographic film and photographic paper. In this experiment photographic paper coated in silver chloride is produced by bringing solutions of silver nitrate and potassium chloride solutions into contact on the paper in the absence of light. A photographic image of an object placed on it can be obtained when the paper is dried and exposed to strong light.