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    Posted 7 years ago in Form 4

    ORGANIC CHEMISTRY

    Reactions involving in Alkane family

      0       1

    Comments  

    Zilahenda Mgozi   Posted on 7 years ago

    1.React with cl gas to form HCL 2.Burn in air to form H2O +CO2

    Posted 7 years ago in Form 2

    What is oxidation

    what damean of oxidation

      0       14

    Comments  

    Bakar Hamad   Posted on 6 years ago

    Oxidation...additional of oxygen
    .. .removal of hydrogen
    .. Looses of electron

    Gentle Dignitary   Posted on 6 years ago

    oxidation is the increase in oxidation state of a compound

    Angel Derrick   Posted on 6 years ago

    Oxidation is any chemical reaction that involves the moving of electrons. Specifically, it means the substance that gives away electrons is oxidized.

    Amosi Edson   Posted on 6 years ago

    oxidation is the additionl of oxygen to a substance or removal hydrogen to a subustance

    Posted 7 years ago in Form 3

    Mole

    What is mole

      0       4

    Comments  

    Annie Rita   Posted on 2 years ago

    it is any substance that contains 6.023*10 power 23 particles

    Nasibu Kkilewa   Posted on 5 years ago

    Mole is the amount of substance which contains as many elementary particles as the number of atoms present in 12g of carbon-12.Since 1 atom/particle from carbon-12 contain 1.9937 times 10 power -23 so that when divided by 12g we can get tthe number of atoms prersent in 12g of carbon-12 which is 6.0223 times 10 power 23 therefore these number of atoms present in this isotope named as MOLE.Hence in other words we can define mole as the quantity which contains Avogadros number/constant(6.022 times 10 power 23).

    Deus Tryphon   Posted on 7 years ago

    is a number of elementary particles contains in a matter as many as in carbon-12

    Deus Tryphon   Posted on 7 years ago

    is a number of elementary contains in a matter as many as in carbon-12

    Posted 7 years ago in Form 3

    Mole

    What is mole

      0       2

    Comments  

    Beatrice Laizer   Posted on 2 years ago

    Is the aamount of substance which contains the avagadros number of particles

    Muslim Juma   Posted on 3 years ago

    mole is the amount of substance which contai avogadro's number

    Posted 7 years ago in Form 2

    Bonging

    importance of covalent bond

      0       3

    Comments  

    Beatrice Laizer   Posted on 2 years ago

    Is a chemical union btn metal and metal or nonmetal and a non metal

    FARAJI DE PLATS   Posted on 5 years ago

    to hold two thing

    Jollie Augustino   Posted on 7 years ago

    they share electrons


    Posted 8 years ago in Form 3

    Electrolysis

    State faraday's laws of electrolysis

      0       3

    Comments  

    Beatrice Laizer   Posted on 2 years ago

    Faraday first law states that
    The mass if a substance liberated or deposited during an electrolysis is direct proportional to the quantity of electricity
    FARADAY SECOND LAW STATE THAT,when the same quantity of electricity pass through an electrolytes the mass of a substance liberated or deposited during an electrolysis is direct proportional to chemical equivalent of substance

    Mkuyu Daniel   Posted on 3 years ago

    First faraday's law of electrolysis state that "The amount of a substance liberated at cathode is directly proportional to the quantity of charge flowing through the electrolyte " m=ZQ
    M=mass
    z=electrochemical equivalent
    Q=quantity of charge

    Innocent Simba   Posted on 8 years ago

    Faraday's 1st Law of Electrolysis - "The mass of a substance altered at an electrode during electricity is directly proportional to the quantity of charge transferred at that electrode."
      m = Z.Q
    Where Z is a constant of proportionality and is known as electrochemical equivalent of the substance.

    Faraday's 2nd Law of Electrolysis - "For a given quantity of D.C electricity (electric charge), the mass of an elemental material altered at an electrode is directly proportional to the element's equivalent weight."

    But the equivalent weight of a substance is equal to its molar mass divided by the change in oxidation state it undergoes upon electrolysis.
         
             chemical equivalent = Atomic weight
                                                Valency
           



    Posted 8 years ago in Form 2

    What is the difference between Deliquescence and efflorescence

    help me with the difference of these two chemistry terms

    Deliquescence and efflorescence
     

      1       3

    Comments  

    Mkuyu Daniel   Posted on 3 years ago

    Deliquescence refers to a process whereby a highly hygroscopic substance absorbs water from the atmosphere to such a degree that the sub while  Efflorescence refers to a process whereby a salt present within a porous material is first dissolved by sorbed water and then transported to the surface of the porous material where the salt then precipitates out of solution. stance actually dissolves in its own sorbed water (e.g. NaCl above 73%RH). 

    SHAIDU ALLY   Posted on 4 years ago

    deliquescent substance which when exposed in air absorb water and form a solution eg . sodium hydroxide WHERES efflorescence is the one which looses water to become anhydrous eg hydrated copper ii sulphate

    Benjamin Kanyika   Posted on 8 years ago

    Deliquescence is the substance which absorbs moisture from the air and form a solution while efflorescence substance is the substance which loose the water or moisture and form anhydrous crystals

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