Separation of matter - class-X

Centrifugation is a technique which involves the application of centrifugal force to separate particles from a solution. The larger the size and the larger the density of the particles, the faster they separate from the mixture. Example- washing machine works on the principle of centrifugation.

A solid-liquid mixture containing a soluble solid in the liquid components can be separated by distillation.

Evaporation is the process used to separate a dissolved solid from a liquid by heating the solution until the solvent turns into vapor, leaving the solid behind.

Solid-solid mixtures can be separated using various physical methods depending on the properties of the components, such as mechanical picking, magnetic properties, or density differences (gravity).

Permanent hardness in water is caused by the presence of dissolved chlorides and sulfates of calcium and magnesium, which cannot be removed by boiling.

Sand settles at the bottom of water so the water can be poured into another container.Thus process is knwon as decantation.

Centrifugation is a method of separating suspended particles of a substance from liquid.

Centripetal force is applied with a centrifuge to sediment heterogeneous mixtures. It is used in industrial and laboratory settings. It is used in the separation of  two immiscible substances.

When an organic compound is present in an aqueous medium and is less soluble in any organic solvent then it is seaparated by continuous extraction.

As all the above compound sublimes, so they are purified by the process of sublimation.

As all others except urea are sublimes so they can be purified by sublimation. But, urea cannot be purified by sublimation.

Sublimation

Sublimation is a specialized change of state when a solid substance skips the liquid phase and moves directly into the gas phase. This occurs because the substance absorbs energy so quickly from the surroundings that melting never occurs.

Examples of Sublimation:

1. "Dry ice" or solid carbon dioxide sublimes.

2. Snow and ice can sublime in the winter months without melting.

3. Moth balls sublime

4. Frozen foods will sublime and you will find ice crystals inside of the box or bag.

Sublimation is a specialized change of state when a solid
substance skips the liquid phase and moves directly into the gas phase. This
occurs because the substance absorbs energy so quickly from the surroundings
that melting never occurs.

Evaporation is the method to separated dissolved solid impurites in the liquid so if we evaporate sea water evaparates and common salt is left behind.

Here ammonium chloride is sublimable so to separate it from common salt we have to do sublimation.

The answer is salt from water.
Evaporation is used to separate a non-volatile soluble salt from a liquid. On heating, the liquid evaporates and soluble salt remains behind.

Evaporation is used to separate a soluble solid from a liquid. For example, copper sulfate is soluble in water its crystals dissolve in water to form copper sulfate solution. During evaporation, the water evaporates away leaving solid copper sulfate crystals behind.

The process of sublimation is used to separate the component from solid-solid mixture which sublimes on heating and the other component being non-volatile.

Camphor is a solid that gets converted to gas without changing to liquid. Hence, it can be separated by sublimation provided the other substance in non-volatile. It is highly volatile.

The process of conversion of water into vapour by heating it to its boiling point is called evaporation.The salt can be easily obtained from the salty water by the process of evaporation. If we boil this water, the water evaporates completely, leaving behind only the salt.

Sublimation is a technique that helps chemists to purify. During sublimation, upon heating, a solid substance is converted to the gas phase without passing through the liquid phase.  A solid is heated under vacuum. The solid volatilizes and condenses as a purified compound on a cooled surface, a non-volatile residue of impurities is left behind.

Sublimation is the process of transferring molecules in the solid phase to the gaseous phase. Since liquid state is skipped in this process, a large amount of energy has to be supplied in order to provide the required molecular motion to the molecules. Hence it is an endothermic change

solids undergo sublimation at low pressures (under vacuum). At standard, atmospheric pressure, a few solids which will sublime are iodine (at slightly higher than room temperature),

Option C is the correct answer.

A mixture of glucose water can be separated by the method of evaporation. Water will evaporate and glucose is left behind.

Sublimation is used for substances that transition directly from solid to gas. Urea does not sublime under standard conditions, whereas camphor, benzoic acid, and naphthalene do.

Sublimation is the process in which a particular solid is converted into gas without changing into liquid. Naphthalene is volatile. It sublimates at room temperature without converting into liquid.

Sublimation is a specialized change of state when a solid substance skips the liquid phase and moves directly into the gas phase. This occurs because the substance absorbs energy so quickly from the surroundings that melting never occurs.

Anthracene is a polycyclic aromatic hydrocarbon that sublimes readily, making sublimation an effective method for its purification.

Salt dissolves in water. There is a high difference in their boiling point, so evaporation can be used to remove the water to obtain salt. The water vapours that evaporates can be condensed to form water. Salt is left behind as residue during evaporation.

By sublimation - Sulphur on heating directly converts into its gaseous state, which can later be converted into its solid state again. Carbon does not show the same property.

Iodine dissolved in alcohol is called tincture of iodine. Alcohol is a volatile liquid. So the mixture can be kept open or warmed in a water bath. Alcohol will evaporate leaving behind the iodine crystals.

There are way in separating mixtures of chloride salts such as that of sodium chloride and ammonium chloride. It can be done by crystallization, filtration, and sublimation. The easiest method among the three is separation by sublimation.  Ammonium chloride sublimes upon heating. Actually, the sublimation is a decomposition of ammonium chloride forming ammonia and hydrogen chloride. Sodium chloride, on the other hand, doesn't sublime and has a higher melting point than ammonium chloride. If we want to separate the mixture, we have to heat up to 330-350 degrees Celsius and collect the gas that will be produced. 

Hence, the correct option is D.

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase.
To separate mixtures that contain a sublimate with volatile component from a non-sublimate impurity, the sublimation process is used. Ammonium chloride changes directly from solid to gaseous state on heating. The gaseous form of ammonium chloride can be cooled easily to get a pure solid.

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase. when heated iodine turns directly to vapours leaving behind the sand particles

Evaporation is a type of vaporization of a liquid that occurs from the surface of a liquid into a gaseous phase that is not saturated with the evaporating substance.Sea water on evaporation leads to formation of salt when the liquid gets vaporized and the salt is left behind.

 Sand and iodine can be seperated by the process of sublimation. It is a process in which a solid converts directly into a gas without converting into a liquid.

On heating the mixture of common salt and ammonium chloride in a china dish white fumes evolve and rise inside the funnel the china dish and cover it, to collect the fumes of the sublimating substance.

Sublimation is used for separating substances with on heating change directly into vapour. The vapour by cooling gives the pure substance in & solid form which is called sublimate. Here camphor wil sublime leaving behind the sand.

Sublimation method is used for separating substances which on heating change directly into vapour. Benzoic acid sublimes on heating.

Camphor is separated from NaCl by Sublimation.
On heating, camphor is collected on the inner surface of the inverted funnel while NaCl left in the dish.
Note: Sublimation is the process of heating a solid to obtain vapours.
When a mixture of NaCl and camphor is heated, camphor sublimes and its vapours are obtained.
The vapours on cooling (when they come into contact with the inner surface of the inverted funnel ) condense into solid.

The process used for the separation of those solids which sublime on heating from non volatile solids is  sublimation.

Note:
Camphor is separated from NaCl by Sublimation.
 On heating, camphor is collected on the inner surface of the inverted funnel while NaCl left in the dish.
 Sublimation is the process of heating a solid to obtain vapours.
When a mixture of NaCl and camphor is heated, camphor sublimes and its vapours are obtained.
The vapours on cooling (when they come into contact with the inner surface of the inverted funnel ) condense into solid.

Sublimation is a technique that helps chemists to purify. During sublimation,upon heating, a solid substance is converted to the gas phase without passing through the liquid phase.  A solid is heated under vacuum. The solid volatilizes and condenses as a purified compound on a cooled surface, a non-volatile residue of impurities is left behind.

Sea water is a mixture. It contains water and dissolved minerals. Water and salt are compounds. Copper is element.

Sublimation is a technique that helps chemists to purify. During sublimation,upon heating, a solid substance is converted to the gas phase without passing through the liquid phase.  A solid is heated under vacuum. The solid volatilizes and condenses as a purified compound on a cooled surface,  a non-volatile residue of impurities is left behind.

Condensed solid produced during sublimation is sublimate. Thus, sublimate is a solid deposit of a substance which has sublimed.

Sublimation can be used to separate a mixture of solids in which one sublimes other does not. Thus, ammonium chloride can be separated from sodium chloride by sublimation. Ammonium chloride sublimes whereas sodium chloride does not.

The term sublimation refers to a physical change of state and is not used to describe transformation of a solid to a gas in a chemical reaction. The combustion of candles, containing paraffin wax, to carbon dioxide and water vapor is not sublimation but a chemical reaction with oxygen.

Iodine is a chemical element with atomic number 53. The heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at a standard conditions that sublimes readily to form a violet gas.

Sublimation process is used to separate mixtures that contain a sublimate with a volatile component from a non-sublimate impurity. Thus, ammonium chloride can be separated from sodium chloride by sublimation. Ammonium chloride sublimes whereas sodium chloride does not.

The given statement is True.
 Method of separation by sublimation is limited. This method can be used for separation of only those compounds that sublime (i.e, change their state on heating from solid to vapour without passing through liquid state). Examples of sublimable compounds include iodine, ammonium chloride, camphor and naphthalene.

Note: If in the given mixture, none of the compounds is sublimable, then method of separation by sublimation cannot be used.

Ammonium chloride is separated from a mixture of sodium chloride and ammonium chloride by the process of sublimation. Ammonium chloride can be sublimed whereas sodium chloride cannot be sublimed. When a mixture of sodium chloride and ammonium chloride is heated, ammonium chloride changes its state from solid to vapour. The vapours of ammonium chloride are then condensed on cold surface. Sodium chloride is left behind.

The mixture of camphor and ammonium chloride cannot be separated by sublimation method since both are volatile substances. Thus the mixture is dissolved in water. Ammonium chloride is soluble in water while camphor is not thus the water containing ammonium chloride is decanted in another beaker. Thus camphor is obtained and now the solution is evaporated to separate ammonium chloride. The solution containing ammonium chloride is heated and boiled off the ammonium chloride is left behind

Sublimation is used to separate a mixture of sand and ammonium chloride. Sublimation is a separation process that entails heating a mixture of solids, where one of the solids transitions from solid to gas without passing through the liquid state. The vaporized solid is then reclaimed by cooling the vapor which reverts back to its initial solid state.

In the case of ammonium chloride and sand, ammonium chloride is the sublimate and changes to vapor

Since crystals of $Y$ were formed on the walls of flask hence it must be some compound which sublimates on heating, and there was no effect on the $X$ so $X$ must be compound with high boiling point. The only combination with these properties are $X=NaCl$, $Y=Naphthalene$

On evaporation of $CuSO _4$ solution, the amount of solvent will decrease and its concentration increases and it will leads to the crystallization of $CuSO _4$.

The correct order of the process would be DFCBAE as shown below.

D.  Place the sand/salt mixture into a beaker and  add water

F.  Stir to allow the salt to dissolve in the water

C.  Filter to remove the insoluble sand

B.  Pour salt water filtrate into an evaporating basin on a tripod over a Bunsen burner

A.  Heat filtrate to evaporate off the solvent (water)

E.  Allow basin to cool & collect salt

A mixture of ammonium chloride and potassium chloride can be separated using the process of sublimation. You must also note that both these substances are sublimable. This technique is quite feasible in this case as the sublimable temperatures of ammonium and potassium chloride differ widely. Between the two, ammonium chloride has lower sublimable temperature. Therefore, it sublimes first followed by potassium chloride.

Iodine sublimes upon heating, while sand does not. This property allows for the separation of a sand-iodine mixture via sublimation.