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Iodine on heating gives off dense purple vapor.
when iodine crysatals are heated, they turn from a solid into a gas (vapour). They start a black colour and as they gradually turn into a gas, they turn to a purple colour. At the end, there are no crystals left.
Iodine (I), sodium iodide (NaI), potassium iodide (KI), hydroiodic acid (HI)
Cupric nitrate is initially blue when in its hydrated form. When heated, it will decompose to form copper oxide, turning black in color.
Either sodium carbonate or copper carbonate
Iodine is a purple-black non metal that changes to a deep purple gas when heated.
The steel wool will burned and turned in black substance.
Iodine on heating gives off dense purple vapor.
When sulfuric acid reacts with black copper oxide and is heated gently, the copper oxide is reduced to copper and water is formed. The reaction can be represented as follows: CuO (s) + H2SO4 (aq) → Cu (s) + H2O (l) + SO2 (g)
green, red-brown, violet-pink respectively.
The transformation of black crystals of iodine into purple vapor of iodine is a physical change. This is because the change does not involve a change in the chemical composition of iodine; it only involves a change in the physical state from solid to gas.
Yes, this observation of a black solid turning into a purple gas when heated suggests a chemical change. The change in color and state indicates that new substances are being formed through chemical reactions taking place in the solid material.
You think to iodine.
purple and black
When purple and black are mixed together, the result is a dark shade of purple that appears almost black, with hints of purple visible under certain lighting conditions.
Purple, its kinda obvious. His robe, his Lambo, both purple.
Iodine ------------------------------------------- The element you describe sounds like iodine, a good test to make sure that it is iodine is to see if the substance sublimes. This means a solid sample of iodine will turn straight from a solid into a gas with no liquid stage.