D.A.V. College of Education Fazilka
ScienceD.A.V. College of EducationFazilkaSubmitted to:Dr.
Amandeep KaurAsst. Prof.Submitted by:SONAM JEARTHRoll no. 90PK
TestingQues. What is a mixture?
Ans. When two or more materials or substances are mixed together
but do not chemically combine.
Ques. There are how many kinds of mixtures?
Ans. Two KindsHomogeneousHeterogeneousQues. How will you
separate the different components of mixtures?
Methods of Separating MixtureSeparation means removal of
substances from the mixture of two or more substances.For
example:Separating stones from riceSeparating tea from tea
leavesChurning milk to obtain butterWhat is Separation?Why do we
separate substances? Handpicking Threshing Winnowing Sieving
Sedimentation Decantation Filtration Evaporation
CondensationMethods of separation
HandpickingUsed for separating large sized impurities like
stone, husk from rice, wheat or pulses
ThreshingUsed for separating grains from stalks. Machines can
also be used for this process
WinnowingUsed for separate heavier and lighter components of
mixture by wind or by blowing air. Example: Separation of lighter
husk particles from seed of grains.
SievingUsed when components of mixtures have different
sizes.Example: Pebbles and stones removed from sandWhy do we
separate substances?Explain the process of threshing.What is
winnowing?Sectional Recapitulation
SedimentationSeparation of two components in such a way that the
heavier substances settle down.
DecantationDecantationis a process for theseparation of
mixtures, by removing a layer of liquid, generally one from which a
precipitate has settled. The purpose may be either to produce a
clean decant, or to remove undesired liquid from the precipitate
(or other layers).
FiltrationFiltrationis commonly the mechanical or physical
operation which is used for the separation of solids from fluids
(liquids or gases) by interposing a medium through which only the
fluid can pass.
EvaporationEvaporationis a type of vaporization of a liquid that
occurs from the surface of a liquid into a gaseous phase that is
not saturated with theevaporatingsubstance.
CondensationCondensationis the change of water from its gaseous
form (water vapor) into liquid water. Condensationgenerally occurs
in the atmosphere when warm air rises, cools and looses its
capacity to hold water vapour. Enlist all the methods of separation
of mixtures.What are the application of decantation?What is
Evaporation?Explain the process of Filtration.
Recapitulation Write the applications of all methods of
separation of mixtures.Home Assignment
