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Its got weak van der waals forces as it is a simple molecule - these intermolecular forces are weak so require less energy to break, leading it to have a low boiling point.
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Purple iodine vapor appears when solid iodine is warmed is that chemical or physical change?
Purple vapour appearing = physical
What black solid forms a purple vapour when heated gently?
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What state is iodine?
Solid in room temperature.
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)
Purple iodine vapor appears when solid iodine is warmed is that chemical or physical change?
Purple vapour appearing = physical
What black solid forms a purple vapour when heated gently?
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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
How does iodine crystal changes into vapours?
Iodine sublimes- i.e it changes from solid to gas without going though a liquid phase.
How can you separate iodine mixed with zinc oxide?
Iodine sublimes. Thus gently heat the mixture and collect the sublimate. The vapor will form solid iodine crystal on a cold surface. The remaining material is zinc oxide.
Is iodine solid a conductor?
No solid iodine does not conduct electricity.
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?
Solid in room temperature.
At STP which element is a solid hydrogen or iodine?
Iodine is a solid at STP.
Colour of iodine solid?
The color of solid iodine is a dark purple.
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.
