9th class chemistry notes in urdu 2011

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A good theory predicts new facts and unravels new relationship between occurring phenomenon. The cell voltage in Daniel cell is 1. The process of formation of geometrical shaped solid substances is called Crystallization. Filtration of crystals. So the radioactive isotopes are used as tracer to trace many hidden things. It states that: The mass of different substance deposited or liberated when same quantity of current is passed through different electrolytes, connected in series are proportional to their chemical equivalent masses.

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  • 9th Class Chemistry Notes in Urdu
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  • 10th Class Chemistry Book Solved Study Notes

    Check 9th class chemistry notes in urdu click here. 7th NovemberPM #1 now its easy to understand and learn chemistry. 9th Class Chemistry Lahore Board Group 1 Urdu Medium Objective-Lahore Board 9th Class Chemistry Lahore Board Group 1 Urdu Medium Subjective. Institute: Lahore Board. Subject: Chemistry; Qualification: 9th.
    Halogens are highly electronegative elements and their electronegativity decreases down the group from fluorine to iodine.

    This indicates that Pb and S always combine in the fixed ratio by mass. If OH- ionic concentration increases aqueous solution becomes basic. Except nitrogen all exist in more than one allotropic forms.

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    Mention the number of atoms on both sides of chemical equation If the number of atoms appear more on one side than the other, balance the equation by inspection method.

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    Phosphoric acid etc.

    A current of 10A was passed for 15 minutes in a solution of silver nitrate. The battery can be used through repeated cycles of discharging and recharging.

    They have five electrons in their outer most shell and require three electrons to complete their octet. Many important reagents like sulphuric acid, Nitric acid, Hydrosulphyuric acid, Silver nitrate etc were discovered. A regular gradation in physical and chemical properties of elements in a group are observed due to gradual change in their electro negativities and atomic sizes. Example: NaOH.

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    Chemisty Notes Class 9 Ix () - Free download as PDF File .pdf), Text File .txt) or read online for More Notes Visit: almati. blogspot. com. Chemistry 9th Biology Urdu Notes (). WCECS_pp Uploaded by.

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    lfa Notes of Chapter 01 of “Chemistry XI” for FSc Part 1 published by Punjab Textbook Board, Test Ch#1 Class 9th. Math Old Fsconline Xi .
    Oxygen was discovered by J.

    Different people observe a phenomenon in different ways. If both solute and solvent are taken on the basis of their masses is called mass by mass percentage concentration. He arranged similar elements in to groups of three. Fill the burette with NaOH up to zero mark.

    In few cases, three dimensional covalent structure formed rather than discrete units, hence diamond and silica are covalent but are very hard and have high melting points.

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    It is used as cleaning agent in soap and detergent.

    All atoms of a given element, are identical in all respects, having same size, mass and chemical properties. Ahmed Raahim Niazi 16 May at They are further sub divided in to two sub-groups. Filtrate of hot super saturated solution. The alkali metals, lithium, sodium, potassium, rubidium, cesium and francium are light metals.

    9th Class Chemistry Notes in Urdu

    The H-shaped tube was weighed in vertical position to avoid mixing.

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    Phosphoric acid etc.

    They contain same electronic configuration and have four electrons in their outermost shell.

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    Cohesive forces between molecules of gases are negligible. They easily accept an electron to form halide ions.

    images 9th class chemistry notes in urdu 2011

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    images 9th class chemistry notes in urdu 2011
    9th class chemistry notes in urdu 2011
    If both solute and solvent are taken on the basis of their masses is called mass by mass percentage concentration.

    Regular Gradation: i. The most common solvent in nature is water. The positive ions i. Examples Alloys such as brass copper and zinc. Liquid boils when molecular motion increases very much due to which their kinetic energy overcome the binding force and separate them.

    This theory was given by British school teacher of chemistry.