Short Questions Flashcards
What is pure substance?
A pure substance consists of a single type of particles.
What do you mean by mixture?
Mixtures are constituted by more than one kind of pure form of matter.
What is impure substance?
An impure substance is made of two or more elements or compounds that are not bonded together chemically.
What are the types of mixture?
There are two types of mixtures are: homogenous mixture and heterogeneous mixtures.
What do you mean by concentration of solution?
The concentration of a solution is the amount of solute present per unit volume or per unit mass of the solution.
What is distillation?
Distillation is the process of separating the components or substances from a liquid mixture by using selective boiling and condensation.
What types of mixtures are separated from the crystallization technique?
Crystallisation technique is used to purify solid with some impurities in it.
What is saturated solution?
Solvent when no more solute can dissolve further at a given temperature is called saturated solution.
What is filtration?
Filtration is a process used to separate solids from liquids or gases using a filter medium that allows the fluid to pass through but not the solid.
What is sublimation?
Sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.
Is whipped cream a colloid? If yes, what type is it?
Yes, it is colloid. It is air dispersed in liquid cream.
Write an example of a solution in which both solute and solvent are liquids
Ethyl alcohol (solute) and water (solvent) both are liquids forming a solution.
Write one property of suspension.
Sedimentation. The suspended particles settle to the bottom of the container on account of gravitational force.
Smoke and fog both are aerosols. In what way are they different?
The dispersed phase in fog is liquid and in smoke is solid.
Among helium and ammonia which one is element and compound?
Element- helium
Compound- ammonia
How can we separate a mixture of two miscible liquids ?
- What separation technique will you apply for separation of the following ?
(i) Ammonium chloride from sodium chloride.
(ii) Different pigments from the extract of flower petals.
How do we test purity of substances?
Name the process to separate the particles of colloid.
What is meant by fractionating column?
What are metalloids?
Suggest any one method by which we can increase the solubility of saturated solutions.
Why dry ice does not wet the surface on which it is kept?
State two reasons to justify that air is a mixture and water is compound.
Distinguish between homogeneous and heterogeneous mixture.
Classify the following mixtures as homogeneous and heterogeneous.
(i) Tincture of iodine (iv) Sugar solution
(ii) Smoke (iii) Brass