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    Chapter 2 Notes Is Matter Aruond Us Pure

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    rupayan majumder
    The document defines and compares homogeneous and heterogeneous mixtures, solutions, suspensions, and colloids. It explains that a homogeneous mixture has uniform composition while a heterogeneous mixture has non-uniform composition. It describes solutions as homogeneous mixtures where particles are very small and cannot be seen, suspensions as heterogeneous mixtures where particles can be seen, and colloids as heterogeneous mixtures where particles are bigger than solutions but smaller than suspensions. The document also defines elements, compounds, metals, non-metals, mixtures, and compounds, and physical and chemical changes. It provides examples to differentiate between the concepts.

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    Chapter 2 Notes Is Matter Aruond Us Pure

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    rupayan majumder
    10 views3 pages
    The document defines and compares homogeneous and heterogeneous mixtures, solutions, suspensions, and colloids. It explains that a homogeneous mixture has uniform composition while a heterogeneous mixture has non-uniform composition. It describes solutions as homogeneous mixtures where particles are very small and cannot be seen, suspensions as heterogeneous mixtures where particles can be seen, and colloids as heterogeneous mixtures where particles are bigger than solutions but smaller than suspensions. The document also defines elements, compounds, metals, non-metals, mixtures, and compounds, and physical and chemical changes. It provides examples to differentiate between the concepts.

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    Original Title

    Chapter 2 Notes Is matter aruond us pure (1)

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    The document defines and compares homogeneous and heterogeneous mixtures, solutions, suspensions, and colloids. It explains that a homogeneous mixture has uniform composition while a heterogeneous mixture has non-uniform composition. It describes solutions as homogeneous mixtures where particles are very small and cannot be seen, suspensions as heterogeneous mixtures where particles can be seen, and colloids as heterogeneous mixtures where particles are bigger than solutions but smaller than suspensions. The document also defines elements, compounds, metals, non-metals, mixtures, and compounds, and physical and chemical changes. It provides examples to differentiate between the concepts.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    10 views3 pages

    Chapter 2 Notes Is Matter Aruond Us Pure

    Uploaded by

    rupayan majumder
    The document defines and compares homogeneous and heterogeneous mixtures, solutions, suspensions, and colloids. It explains that a homogeneous mixture has uniform composition while a heterogeneous mixture has non-uniform composition. It describes solutions as homogeneous mixtures where particles are very small and cannot be seen, suspensions as heterogeneous mixtures where particles can be seen, and colloids as heterogeneous mixtures where particles are bigger than solutions but smaller than suspensions. The document also defines elements, compounds, metals, non-metals, mixtures, and compounds, and physical and chemical changes. It provides examples to differentiate between the concepts.

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    of 3

    Chapter 2 Is matter around us pure

    *(TERM I Portion)
    Q1. a) Differentiate between homogeneous and heterogeneous mixtures.

    Ans
    Homogeneous mixtures Heterogeneous mixtures
    The mixture of two or more substances that The mixture of two or more substances that
    are equally distributed throughout. They are unequally distributed. They have non-
    have uniform composition. uniform composition.
    The constituent substances are not physically The constituent substances are physically
    distinct. distinct.
    e.g. salt or sugar in water, alcohol in water, e.g. sand and salt, sugar and salt, sand and
    Sulphur in carbondisulphide water, oil and water.

    b) Compare the properties of solution, suspension and colloids.

    Solution Suspension Colloids


    A solution is a homogeneous Suspension is a A colloid is a heterogeneous
    mixture. heterogeneous mixture. mixture.
    The particle are very small The particles can be seen by The particles are big in size
    (1 nm diameter) in size and naked eyes. than solution but small than
    cannot be seen by naked suspension and cannot be
    eyes. seen by naked eyes
    The particles being too small The particles scatter the light The particles are big enough
    do not scatter the light passing through it. to scatter a beam of light and
    passing through solution. So the path of light is visible. makes it path visible.
    So the path of light is not
    visible.
    Solution is stable as the Suspension is unstable as the Colloid is stable as the solute
    solute do not settle down solute particles settle down do not settle down when left
    when left undisturbed. when left undisturbed. undisturbed
    Cannot be separated by Can be separated by filtration Cannot be separated by
    filtration. filtration but can be
    separated by centrifugation.
    e.g. sugar dissolved in water e.g. Chalk powder or wheat e.g. Milk or ink in water
    flour in water.

    Q.2. Name the components of a solution and colloids? Define them.


    Ans: The two components of solution are: 1) Solute 2) Solvent
    Solvent: The component of a solution that is present in large quantity and dissolves the solute is
    called solvent.
    Solute: The component of a solution that is present in small quantity and is dissolved in solvent.
    The two components of colloids are: 1) Dispersed phase 2) Dispersing medium
    Dispersed phase: The solute- like component or dispersed particles in a colloid are called
    dispersed phase.
    Dispersing medium: The component in which the dispersed phase is suspended is known as
    dispersing medium.
    Q 3. Differentiate between
    a) Elements and compounds
    b) Metals and non-metals
    c) Mixtures and compounds
    d) Physical and chemical change

    Ans a)
    Elements Compounds
    Elements are the basic form of matter that A compound is a substance composed of two or
    cannot be broken down into simpler more elements chemically combined in a fixed
    substances by chemical reactions. proportion.
    Example: iron, Sulphur, hydrogen, oxygen Iron sulphide, water

    b)
    Metals Non- metal
    1. They are lustrous, sonorous, malleable 1. They are non-lustrous, non-sonorous, not malleable and
    and ductile not ductile.
    2. They have silvery grey or golden yellow 2. They display a variety of colours.
    colour
    3. They conduct heat and electricity 3. They are poor conductors of heat and electricity
    Example:- iron, copper Example:- hydrogen, iodine

    c)
    Mixtures Compounds
    1. Mixtures are formed when elements or 1. Compounds are formed when elements react
    compounds are just mixed together. with each other.

    2. They have variable composition. 2. The composition of compounds are always


    fixed.
    3. A mixture shows the properties of the 3. A compound has totally different properties
    constituent particles. than that of constituent elements it is made up of.
    4. The constituents can be separated by physical 4. The constituents can be separated only by
    methods. chemical or electrochemical methods.

    Example:- mixture of iron and Sulphur. Example:- compound iron sulphide formed when
    iron reacts with sulphur

    d)
    Physical change Chemical change
    A change which takes place in the physical A change that takes place in the chemical properties of a
    properties of a substance like colour, substance or undergo a change in chemical composition
    hardness, rigidity, fluidity, density, melting is known as chemical change. It is also known as chemical
    point, boiling point etc. is known as reaction.
    physical change.
    Example: melting of ice( interconversion of Example:- burning of fuel.
    states)

    Name the following


    1. Liquid metal at room temperature – mercury
    2. Liquid metals just above room temperature-gallium, Cesium
    3. Liquid non-metal- bromine
    4. Lustrous non-metal- Iodine
    5. Examples of metalloids – Boron, silicon and germanium
    6. Any two gaseous non-metals- oxygen, nitrogen
    7. Any two Solid metals- gold, iron
    8. Any two solid non-metals- carbon, sulphur
    9. Nonmetal which conducts electricity- graphite (form of carbon)

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