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    Posted 2 years ago in Form 2

    Oxygen

    what are the industrial use of oxygen

      0       3

    Comments  

    Susan Mseke   Posted on 8 months ago

    It's used as raw material

    Erica Sangiwa   Posted on 2 years ago

    it can be used for welding and cooling

    Joey Bilika   Posted on 2 years ago

    It's used with fuel gases in ; gas welding , gas cutting , oxygen scarfing , flame cleaning , flame hardening and flame straightening .
    NOTE: In gas cutting the oxygen must be of high quality to ensure a high speed and a clean cut

    Posted 2 years ago in Form 2

    Oxygen

    what reagents can be used to prepare oxygen

      0       2

    Comments  

    Tunu Mwakajinga   Posted on 2 years ago

    Oxygen can prepare by decomposition of hydrogen peroxide
    Heating of potassium chloride with catalyst
    Fractional distillation of oxygen

    Joey Bilika   Posted on 2 years ago

    Oxygen can be prepared by ;
    reacting sodium peroxide and water
    heating potassium manganate (VII)
    Hydrogen peroxide Manganese (VI ) oxide Water + Oxygen

    Posted 2 years ago in Form 2

    Oxygen

    what are the properties of oxygen

      0       2

    Comments  

    Tunu Mwakajinga   Posted on 2 years ago

    It is tasteless ,odourless, colourless
    It is neutral to litmas paper
    It is boiling at -318c degree
    It support combustion
    It react with metal to form basic oxides
    It react with non metal to form acid oxides

    Joey Bilika   Posted on 2 years ago

    Hey gal ,
    did u want the chemical or physical properties

    Posted 2 years ago in Form 2

    Hydrogen

    what are the common  drying agents used for drying gases

      0       3

    Comments  

    Frank Majibwene   Posted on 2 years ago

    sulphuric acid

    Beatrice Laizer   Posted on 2 years ago

    Sulphuric acid

    Henry Macharia   Posted on 2 years ago

    Calcium chloride,calcium sulphate, sodium sulphate and magnesium sulphate

    Posted 2 years ago in Form 2

    Hydrogen

    name the method of collecting dry hydrogen gas

      0       2

    Comments  

    Beatrice Laizer   Posted on 2 years ago

    Reaction of dilute hydrochloric acid with metals

    Joey Bilika   Posted on 2 years ago

    by reacting hydrogen gas with heated copper (II) oxide
    in short DISPLACEMENT METHOD

    Posted 2 years ago in Form 2

    Water

    what is a molecule

      0       3

    Comments  

    MULLER DON   Posted on 2 years ago

    Molecule is the smallest particles which exit freely

    Beatrice Laizer   Posted on 2 years ago

    Is the smallest individual particles of an element which are cavalently bond together

    JESSIE DAUD   Posted on 2 years ago

    molecule is the smallest particle of an element or compound which is made up of two or more atoms covalently bonded together

    Posted 2 years ago in Form 1

    The Scientific Procedure

    metal D  reacts With an oxide of metal  E , but metal F does not . metal  D  can reduce the oxide  of metal  G but metal F cannot .arrange the materials in order of reactivity starting with the least reactive.

      0       1

    Comments  

    Beatrice Laizer   Posted on 2 years ago

    Use the this trick to understand flow in reactivity series
    Stop,
    Calling
    Me
    A,
    Careless,
    Zebra,
    Instead
    Try
    To
    Learn
    How,
    Copper

    Posted 2 years ago in Form 3

    The Mole Concept And Related Calculations

    what is molarity 

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

     

    what is molarity and molar mass

     

    ..

      0       4

    Comments  

    Kelvin Mkosamali   Posted on 2 years ago

    He

    MULLER DON   Posted on 2 years ago

    Molar mass is the mass of one mole of substance

    MULLER DON   Posted on 2 years ago

    Molarity is the number of one mole of solute dissolve in one litre

    Beatrice Laizer   Posted on 2 years ago

    Molarity is the ratio of concentration and molar mass.
    Molar mass is the sum of atomic number in a compound

    Posted 2 years ago in Form 1

    Air Combustion, Rusting And Fire Fighting

    Is air a mixture or a compound ?explain?

      0       4

    Comments  

    MUSSA MPELLEMBE   Posted on 2 years ago

    a mixture

    Josephine Luambano   Posted on 2 years ago

    Air is a mixture becaus it contains gases which are oxygen nitrogen carbon dioxide and rare gases

    Beatrice Laizer   Posted on 2 years ago

    Mixture

    Juin DEZINAVEL   Posted on 2 years ago

    air is a mixture of gases as oxygen,carbon 4 oxide ,rare gases and nitrogen

    Posted 2 years ago in Form 1

    The Scientific Procedure

    metal  A  reacts with steam to form an oxide  B  and a gas  C.the oxide turns yellow on heating and white when cold .name the substances;

     

       A

     

       B

     

        C

      0       1

    Comments  

    Beatrice Laizer   Posted on 2 years ago

    Sadium

    Posted 2 years ago in Form 2

    Formula Bonding and Nomenclature

    what type of changes takes place when magnesium burns in air explain

      0       2

    Comments  

    Mussa Samwel   Posted on 2 years ago

    Is the change where by new substance are formed

    Beatrice Laizer   Posted on 2 years ago

    Chemical change

    Posted 2 years ago in Form 1

    Matter

    using  kinetic theory of mater explain;

     

    1. why solid have a fixed volume
    2. why gases are easily compressed

      1       1

    Comments  

    Beatrice Laizer   Posted on 2 years ago

    Solid have fixed volume because it's particles are closed packed together
    Gases are easily compressed they it's particles are far from each other hence there's a lot of space to be compressed

    Posted 2 years ago in Form 57121

    Structure of the Atom and the Periodic Table

    element          electron arrangement          valency

     

    P                          2.2                                   2

     

    Q                         2.7                                   1

     

    R                         2.8.2                                2

     

    S                        2.8.8.2                              1

     

     

    [a] Which two elements have similar chemical properties 

    ,  EXPLAIN 

     

     

    [b] what is the most likely formula of a carbonate of S

     

     

     

    Show more
      0       0

    Comments  

    Posted 2 years ago in Form 57121

    Structure of the Atom and the Periodic Table

    What is the ionic structure of Argon ion 

      0       0

    Comments  

    Posted 2 years ago in Form 3

    Chemical Kinetics, Equilibrium And Energetics

    RELATE CHEMICAL WITH TEARS

      0       2

    Comments  

    Mustaphy Mohammed   Posted on 11 months ago

    again

    Beatrice Laizer   Posted on 2 years ago

    Tear are related to chemical like an acid because it has sour taste

    Posted 2 years ago in Form 2

    Periodic Classification

    what are metalloids.

      0       2

    Comments  

    Beatrice Laizer   Posted on 2 years ago

    Are metals in a periodic table which display both metallic and non metallic characteristics

    PR!N€£ - D@ GRIEZZ. #   Posted on 2 years ago

    *WHAT'S UP , POPI.
    -Metalloids are elements that tend to display both metallic & non-metallic x - tics/ properties.

    Posted 2 years ago in Form 2

    Periodic Classification

    Guys i am new can i join your group plz

      0       8

    Comments  

    Sygribertha Massawe   Posted on 2 years ago

    Actually u can also ask a troublesome question if u have

    PR!N€£ - D@ GRIEZZ. #   Posted on 2 years ago

    *OF-CAUSE , YAS U CAN.#

    Zainab Ghasia   Posted on 2 years ago

    yes

    Captain Magu   Posted on 2 years ago

    PP

    Posted 2 years ago in Form 3

    The Mole Concept And Related Calculations

    you can explain about mole concept and example good

      0       2

    Comments  

    Elias Gebron   Posted on 2 years ago

    good girl you are able 

    Zainab Ghasia   Posted on 2 years ago

    mole is amount of substance that contains avogadros number

    Posted 2 years ago in Form 4

    Organic Chemistry

    why when you open a refrigerator you find ice ?

      2       2

    Comments  

    Ciara Jol   Posted on 2 years ago

    cause it is zero degrees inside

    Fankie Peace   Posted on 2 years ago

    because it`s cold inside?

    Posted 2 years ago in Form 1

    Introduction To Chemistry

    hi am new here please can i join in ur discussion

     

      0       6

    Comments  

    Careen Temba   Posted on 2 years ago

    Yeah

    Captain Magu   Posted on 2 years ago

    PP

    Alicia Mseke   Posted on 2 years ago

    Welcome

    Fankie Peace   Posted on 2 years ago

    yes

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