Does a pure substance leave residue?

A pure substance on heating leaves behind a white residue and gives out a colourless, odourless gas. (i) The given substance cannot be an element because on heating it breaks up into a gas and a white residue. (ii) Since the substance is pure, it cannot be a mixture. Therefore, the given substance is a compound.

Why does iodine on heating does not leave any residue?

Iodine and Ammonium chloride are sublimate particles. On heating they start sublimating,that is they directly convert to gas without entering into liquid state. A sublimate particle doesn’t leave ash while sublimation.

What water does not leave residue?

Truth: Soft water is a better cleaner for household cleaning and laundry, as it doesn’t leave behind the mineral residue that hard water does. When it comes to your body, soft water may not be the superior cleaner. The minerals in hard water give soap something to cling to, so it can easily rinse away.

Does alcohol leave residue on heating?

Any (pure) alcohol will evaporate with no residue left behind.

What happens when iodine is heated?

Iodine is a dark purple (almost black) crystalline solid. Iodine crystals slowly sublime at room temperature, and when heated they turn into deep-purple vapors.

Can you wash with distilled water?

FinallyYou can use undistilled water for regular washing if you’re sure your water isn’t hard and if you very completely dry the entire car after you rinse. If you’re applying a coating or sealant, always use distilled water. If your tap water is hard, consider using distilled water when you wash your car.

Which Liquids leave a residue on heating?

Answer: Out of mercury, brine, and bromine. It is Brine which will leave behind a residue when heated and evaporated. This is because mercury is metal and bromine is an element but brine is a solution of salt in water, and when it is burned, the salt is left behind as a residue which can be easily seen.

Which of the following will leave residue on heating?

Brine is salt solution. When it is heated, water will evaporate and salt will be left as residue.

Can we heat iodine?

Iodine melts at 112.9 C and boils at 183.0 C; its vapor pres- sure is 100 mm at 116.5 C (5). Van der Waals forces that link iodine molecules together in a crystal are relatively weak. But being heated very quickly, or in a closed vessel, crystalline iodine melts.

When iodine is heated What does it form and what is the name of that thing?

On heating iodine in the test tube, iodine evolves as violet fuming gas. (ii)If we refer to the reactivity series, we can spot that Iron is more reactive than copper. Displacement reaction can be defined as a type of chemical reaction where one element is displaced by another element in the compound.

Which substance leaves no residue on heating?

Name a substance which, on heating, leaves behind no residue. Camphor is a very common substance that is known to sublime on heating. When camphor is heated, it changes directly from the solid state into the gaseous state and does not leave any residue behind.

Why does water not leave a residue when heated?

Usually any pure substance that is heated up over its boiling point won’t leave any residue. When water is heated it evaporates but leaves behind whatever else is mixed in with it. Unless it’s pure water, then there should be no residue left behind. So basically if something leaves behind a residue, it wasn’t a pure substance in the first place!

What is the residue when ammonium nitrate is heated?

Ammonium nitrate leaves no residue when heated: N H 4. ​. N O3. ​. → N 2. ​. O+2H 2. ​.

What are some materials that contract when they are heated?

The general name for a solid which contracts when it is heated is a negative thermal expansion (NTE) material, and the linked wikipedia article lists several materials which have that property. If this question is in regards to recent news stories, this is the one you probably have in mind: 3-D-printed structures shrink when heated.