CHEMISTRY [1 Mark Question Answer]

Noble gases : Noble gases are those which do not react chemically with other elements or compounds e.g. helium, neon, etc.

Metalloids : Metalloids are those substances which have some properties of metals and some of non-metals e.g. boron, silicon.

Examples : Hydrogen, oxygen, nitrogen, carbon, chlorine, sulphur, phosphorus, etc.

Chocolate wrappers - Aluminium

Chlorophyll - Magnesium

Chalk - Calcium

Haemoglobin - Iron

Elements : An element is the basic form of matter that cannot be broken down into simpler substances by chemical reactions.

Compounds : A compound is a pure substance formed by the chemical combination of two or more elements in a fixed ratio by mass.

The filter paper acts as “stationary phase” while the solvent act as “mobile phase”.

Chromotography is based on differential affinities of compounds towards two phases i.e. stationary and mobile phase.

The simplest type of chromatography is “Paper chromatography”.

It is named so, because earlier it was used to separate mixtures containing coloured components only but these days this technique is applied to colourless substances too.

The process of separating different dissolved constituents of a mixture by their absorption on an appropriate material is called chromatography.

The advantage of distillation is that both components of the
solid and liquid mixture are obtained. Whereas in evaporation only solid is obtained.

Immiscible liquids : Heterogeneous liquid-liquid mixtures are called immiscible liquids.

Miscible liquids : Homogeneous liquid-liquid mixtures are called miscible liquids.

Distillation : Distillation is the method of getting a pure liquid from a solution by evaporating and then condensing the vapours.

Sublimation : The process in which a solid changes directly into its vapours on heating is called sublimation.

Filtration : The process of separating solid particles from liquid by allowing it to pass through a filter paper is called filtration.

Evaporation : Is the process ~of converting a liquid into its vapours state either by exposing it to air or by heating.

Liquid + Liquid mixture :

• Oil in water,
• Alcohol and water.

Solid + Liquid mixture :

• Sand and water,
• Charcoal and water.

Solid + Solid mixture: Sand and sugar,

• Sand and stone,
• sand and sugar.

Alum

Evaporation.

We can separate iron metal from non-magnetic impurities by the method of magnetic separation.

Yes food that we eat is a mixture of carbohydrates, proteins, fats, minerals and vitamins.

Sedimentation and Decantation

Loading is basically speeding up sedimentation.

Filtration is a method used to separate fine particles of insoluble solid from a liquid.