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What is a dark grey solid that sublimes to form a violet vapor?
The substance you are describing is likely iodine. Iodine is a dark grey solid that can sublime directly from a solid to a vapor without going through the liquid state. When iodine sublimes, it forms a violet vapor.
What is sublimation and give an example of a substance that sublimes?
If zinc chloride is heated strongly the solid will sublime.
What is the formula of iodine crystals?
Iodine exists as I2. The crystal of iodine is formed simply by the interaction of iodine molecules as a result of Van de Waals forces, which allows for these molecules to bond together to form a solid.
What is an example of sublimation solid to vapour?
Dry ice (solid CO2) sublimes- the cold CO2 - the "fog" is caused by condensation of water vapour in the air. Another example is solid iodine, which when heated in a test tube sublimes and precipiattes at the cool end of the tube.
What is iodine vapour?
A "vapor" in chemistry is always the gas phase of a substance that is more familiar in one of its condensed phases: liquid or solid. Therefore, iodine vapor is the gas phase of the element iodine, and has the same molecular composition as the solid, I2. Iodine is a solid at standard temperature and pressure, but sublimes directly to gas phase, without any intermediate liquid phase, at only moderately higher temperatures than the standard.
Why iodine exist in solid state but it is a gas?
Iodine sublimes (i.e., goes from a solid to a gas) at room temperature and atmospheric pressure. However, it will exist as a solid for a very long time if it is kept in a closed container. As the iodine solid sublimes, the pressure will increase slightly within the closed container which will cause the iodine gas to reach an equillibrium state with the solid iodine (i.e., there will not be an increase in the amount of iodine gas in the container).
Can iodine ever be in the liquid state or it just sublimes on heating?
Iodine can exist as a solid, liquid, or gas. Its normally solid at STP, but with slow heating you can get it into its liquid form. It sublimes, so the heat must be well controlled. After he pours liquid bromine, this person then shows some liquid iodine.
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.
Why is iodine heated gently?
Because it sublimes that is it directly forms into a solid
How does iodine crystal changes into vapours?
Iodine sublimes- i.e it changes from solid to gas without going though a liquid phase.
What solid sublimes on heating?
Some solids are Carbon dioxide, Snow, Iodine and Naphthalene
A shiny black solid was heated and formed a purple vapour which on cooling became a black solid again Is this a physical or chemical reaction and explain?
This is a physical change. The solid is Iodine, which sublimes on heating to form gaseous Iodine. When cooled, it sublimes again to form solid Iodine. Since this change is only the change of physical states, and since there's no change in the chemical structure of Iodine, this is a physical change.
Which halogen sublimes to violet vapours?
iodine is the only halogen in solid form. so it is the halogen which gives violet vapours on sublimation...
What is a dark grey solid that sublimes to form a violet vapor?
The substance you are describing is likely iodine. Iodine is a dark grey solid that can sublime directly from a solid to a vapor without going through the liquid state. When iodine sublimes, it forms a violet vapor.
Why is liquid iodine not visible if crystals are heated in the open air?
Because Iodine, like Carbon dioxide, sublimes straight from a solid to a gas and does not have a liquid phase.
What is an element that is a shiny black solid and gives off a purple vapor when heated?
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.
What is the difference between iodine crystals and iodine solution?
Iodine crystal is solid Iodine. Iodine solution is when Iodine crystals are dissolved in water.
