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    photo
    Posted 3 hrs ago in Form 2

    Oxygen

    What are the methods of preventing rusting

     

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    photo
    Posted 6 mins ago in Form 3

    Chemical Equations

    What is the meaning of atmospheric oxide

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    Posted 3 hrs ago in Form 1

    Introduction to Chemistry

    why is a luminous flame yellow in colour

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    Faraja Kessy   Posted on 15 hrs ago

    Because it burns the air which could contain alot of things such as dust particles

    photo
    Posted 7 hrs ago in Form 4

    Soil Chemistry

    Advantages of synthetic fiber over natural fiber?

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    photo
    Posted 15 hrs ago in Form 2

    Fuels And Energy

    Hi scientists! What is the definition of destruction distillation and how does it work?

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    photo
    Posted 15 hrs ago in Form 3

    Hardness Of Water

    how can we know if it is hard water?.

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    Betty Chao   Posted on 15 hrs ago

    It doesn't form lather

    Daniel Mwemezi   Posted on 15 hrs ago

    it do not form lather

    Spinkson Ratemo   Posted on 2 days ago

    Hard water does not lather easily with soap.

    photo
    Posted 16 hrs ago in Form 2

    Atomic Structure

    Who first proposed atomic theory base on scientific  knowledge

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    Daniel Mwemezi   Posted on 15 hrs ago

    A scientist called DALTON

    Christinah Fred   Posted on 2 days ago

    I think it’s John dalton

    photo
    Posted 17 hrs ago in Form 2

    Atomic Structure

    What is a mass number and relative atomic mass 

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    Daniel Mwemezi   Posted on 15 hrs ago

    Mass number this are the number of protons and neutrons

    Christinah Fred   Posted on 2 days ago

    Pls follow for more info

    Christinah Fred   Posted on 2 days ago

    Mass number is the total of protons and nucleons in the nucleus of an atom and r.a.m. Is the ratio of average mass per atom of an element to the twelfth of mass of carbon 12 atom

    photo
    Posted 19 hrs ago in Form 2

    Fuels And Energy

    Am issam my question is what do you understand by  about peat

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    photo
    Posted 23 hrs ago in Form 4

    Pollution

    Why has air pollution reduced in these days of corona?

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    Comments  


    Daniel Mwemezi   Posted on 15 hrs ago

    due to the reduction of human activities

    Faraja Kessy   Posted on 15 hrs ago

    I think because the rate many workers have reduced cause of Corona especially industrial worker's some of them don't go to work which cause the of air pollution esp in industries

    Fankie Peace   Posted on 2 days ago

    reduced human activity

    Rose Rebecca   Posted on 2 days ago

    Dnt know

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    Posted 1 day ago in Form 1

    Introduction To Chemistry

    5 Importances  of  chemistry [10 mks]

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    Daniel Mwemezi   Posted on 15 hrs ago

    helps us to make chemicals

    Mary Nkonya   Posted on 15 hrs ago

    Help us get scientific knowledge

    Faraja Kessy   Posted on 15 hrs ago

    Help us in applying acquistic skills

    ZIPPORAH Chepkorir   Posted on 2 days ago

    It helps in Manufacture of drugs

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    Posted 2 days ago in Form 1

    Introduction To Chemistry

    What are the career oportunities of chemistry

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    Daniel Mwemezi   Posted on 15 hrs ago

    laboratory technician

    Mary Nkonya   Posted on 15 hrs ago

    Pharmacist

    Faraja Kessy   Posted on 15 hrs ago

    Doctors, surgeona and scientist

    ZIPPORAH Chepkorir   Posted on 2 days ago

    Medicine
    teacher

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    Posted 2 days ago in Form 2

    Atomic Structure

    atomic mass of flourine

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    Daniel Mwemezi   Posted on 15 hrs ago

    18

    Andrew Mash   Posted on 15 hrs ago

    18.998

    ZIPPORAH Chepkorir   Posted on 2 days ago

    18

    Fifi Frank   Posted on 3 days ago

    59

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    Posted 2 days ago in Form 2

    Periodic Classification

    Name an appropriate apparatus that is used to prepare standard solutions in a laboratory

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    Daniel Mwemezi   Posted on 15 hrs ago

    volumetric flask

    Fifi Frank   Posted on 3 days ago

    Volumetric flask conical flask etc

    Fifi Frank   Posted on 3 days ago

    Volumetric flssk

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    Posted 2 days ago in Form 3

    Compounds Of Metals

    N

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    Samuel Kinuthia   Posted on 2 days ago

    MgCl2

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    Posted 2 days ago in Form 1

    Introduction To Chemistry

    how can a mixture of lead oxide ammonium chloride and sodum chloride be separated to obtain a sample of each

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    Fankie Peace   Posted on 3 days ago

    I would add Na2CO3 solution to precipitate PbCO3 and generate NH3 gas and gently boil the mix and collect the evolved ammonia in dilute HCl solution. NH4Cl can be isolated by vacuum distillation of the water and excess HCl. Filter and wash the PbCO3 and treat with HCl to convert to PbCl2. Neutralize the carbonate-NaCl solution with HCl. Evaporate the water to isolate NaCl. You will have made some extra NaCl.

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    Posted 3 days ago in Form 3

    The Mole Concept And Related Calculations

    Ga

     

    When burning magnessium is lowered into a gas jar containing nitrogen (I)oxide it continues burning forming a white solid

     

    (A)

    name the white solid

     

    (B) write the chemical equation formed

     

     

     

     

     

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    Comments  


    Guyatu Jarso   Posted on 3 days ago

    Magnesium oxide...
    Mg +N²O --- MgO + N²

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    Posted 3 days ago in Form 1

    Matter

    what is matter

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    Daniel Mwemezi   Posted on 15 hrs ago

    is anything that has got mass and occupies space

    Mary Nkonya   Posted on 15 hrs ago

    is anything that has got mass and occupies space

    ZIPPORAH Chepkorir   Posted on 2 days ago

    Matter is ANYTHING that occupies space and has mass

    Jaqueline Kijazi   Posted on 2 days ago

    anything that has weight and occupies space

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    Posted 1 week ago in Form 4

    Non Metals And Their Compounds

    please for anyone whose out there . tell me other methods of preparing nitrogen other from heating of ammonium nitrate

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    Fifi Frank   Posted on 3 days ago

    Burning other compounds apart from zinc n lead of nitrogen...... Look at nitrogen n its compounds

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    Posted 1 week ago in Form 3

    Chemical Equations

    Why nitric acid is not used in the laboratory preparation of hydrogen gas?

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    Fifi Frank   Posted on 3 days ago

    Exacty as he says.... It oxidises hydrogen gas to water H2O

    Kimotho Kabucho   Posted on 4 days ago

    It oxidizes hydrogen to water

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