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What black solid forms a purple vapour when heated gently?
Iodine is a black solid that sublimes directly to a purple vapor without passing through a liquid phase when heated gently.
Purple iodine vapor appears when solid iodine is warmed is that chemical or physical change?
It is a physical change because the iodine is changing state from solid to gas without forming any new substances.
Why is it physical change when purple iodine appears when solid iodine is warmed?
Because the Iodine is undergoing a phase change, which is a physical change. The Iodine is going from a solid to a liquid (I presume), and it's changing color. Those are both examples of physical changes. Phase changes are easily reversible without the use of energy, you could just freeze the iodine, and have the solid again. As for the color change, that's true for a lot of elements, like Mercury. This is not an example of a chemical change because not only is it easily reversible, but because no new substance is formed. You still only have Iodine, but in a different phase, and in a different color.
What state is iodine at room temperature?
Iodine is a solid when at 25 degrees centigrade (room temperature)
How do you separate a mixture of iodine solid and sodium chloride?
Well honey, you can separate iodine solid and sodium chloride by sublimation. Just heat up the mixture and the iodine will turn into a gas and leave the sodium chloride behind. Then you can just collect the iodine gas and let it cool down to form solid iodine again. Easy peasy lemon squeezy!
What black solid forms a purple vapour when heated gently?
Iodine is a black solid that sublimes directly to a purple vapor without passing through a liquid phase when heated gently.
Why iodine vaporize when heated gently?
Iodine vaporizes when heated gently because of sublimation, where the solid iodine directly transforms into iodine vapor without passing through a liquid phase. This occurs due to the weak intermolecular forces between iodine molecules, allowing them to escape from the solid crystal lattice and form a gas.
Purple iodine vapor appears when solid iodine is warmed is that chemical or physical change?
It is a physical change because the iodine is changing state from solid to gas without forming any new substances.
Why is iodine heated gently?
Because it sublimes that is it directly forms into a solid
Is ammonium hydroxide a sublimative substance?
No. Sublimative substances (wow thats a mouthful!) are solids that when heated do not form a liquid but instead vaporise. Ammonium hydroxide cannot be isolated as a solid. It only exists in aqueous solution. An example of a solid that sublimes is Iodine which when heated gently in a test tube produces purple fumes and the dpoits as solid iodine on the cooler sides of the test tube above the heat. If you want a more technical description of sublimation look up sublimation (pahse transition) in Wikipedia
What element sublimes when gently heated?
Iodine is an element that sublimes when gently heated. Sublimation is the process of a substance transitioning directly from a solid to a gas phase without passing through the liquid phase.
Why is it physical change when purple iodine appears when solid iodine is warmed?
Because the Iodine is undergoing a phase change, which is a physical change. The Iodine is going from a solid to a liquid (I presume), and it's changing color. Those are both examples of physical changes. Phase changes are easily reversible without the use of energy, you could just freeze the iodine, and have the solid again. As for the color change, that's true for a lot of elements, like Mercury. This is not an example of a chemical change because not only is it easily reversible, but because no new substance is formed. You still only have Iodine, but in a different phase, and in a different color.
Colour of iodine solid?
The color of solid iodine is a dark purple.
At STP which element is a solid hydrogen or iodine?
At standard temperature and pressure (STP), iodine is a solid while hydrogen is a gas.
How do you get pure dry iodine from a mixture of iodine and sand.?
Well every school kid knows about the 'cold finger' separation technique. Iodine changes from a solid straight to a gas when heated. It sublimes. So heat the sand/iodine mixture in a pyrex tube or flask which has a 'cold finger' inserted. The hot iodine gas will rise, hit the cold finger and form pure solid iodine crystals on the cold finger. Collect from the finger. This really is bog standard school kid chemistry.
Is Iodine a soild or gas?
Elemental iodine is a solid. But it is a volatile solid in that chemists will use solid iodine in a chamber to "iodine stain" substances in thin layer chromatography. Thus iodine is like having a volatile solid.
What state is iodine at room temperature?
Iodine is a solid when at 25 degrees centigrade (room temperature)
