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  1. N

    Anyone got some good web sites about experiments of physics?

    anyone got some good web sites about experiments of physics? I would like to do a few experiments but i am not very sure the procedures.I dont want my house blown off !
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    I need some helps how does acid affect the ionization of water ?

    i need some helps....how does acid affect the ionization of water ? ....how does acid affect the ionization of water ? if there are more hydroximum ions in the solution,what will the change of ionization of water?
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    How does three chambers of heart help the amphibians?

    it seems that these kinds of animals can prevent blood going throught the lung (pulmonary vein,artey)Can anyone clarify it plz?
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    Good books

    hi everyone ~ Does anyone recommend some good books for me?i am studying at secondary school, which is in hong kong.
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    How does ions affect rusting

    how does ions affect rusting
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    Thick wall or thin wall ?

    Cells with thick wall can support the whole organisms. Then what is the function of thin wall?
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    Light wave travelled?

    In my poor knowledge, wave is created by a disturbance and meanwhile the particle just move upward or downward in a transverse wave . However , light seems a different one . It is move! can anyone explain it for me please?
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    Can pure molten hydrochloric acid conduct electricity?

    can pure molten hydrochloric acid conduct electricity?
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    What is the by-product when skeletal cells respire anaerobically ?

    What is the by-product when skeletal cells respire anaerobically ?
  10. N

    Actually how does mountain form?

    Actually how does mountain form? By constructive plate boundies? or what?
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    Why does astronaut feel ' no weight ' when in space?

    why does astronaut feel ' no weight ' when in space?
  12. N

    Which type of rains are most powerful?

    which type of rains are most powerful?
  13. N

    Why mineral salts do not considered as energy flow?

    Why mineral salts are not considered as energy ? Why mineral salts are not considered as energy ?
  14. N

    Which newton's law describes inertia is proportional to mass?

    1.Which newton's law describes inertia is proportional to mass? 1st or 2nd? 2.An object is on a slope, the graph of v-t shows that there is negative acceleration, how do you explain it ?
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    Coriolis force

    why doesnt Coriolis force affect the wind speed but only the wind direction?
  16. N

    Algae and pH value

    what is the relationship between Algae and pH value? why there are more algae ,pH value rises?
  17. N

    Is these statements about temperature true?

    Northern summers are hotter than southern summers. Northern winters are colder than southern winters.
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    What is meant by 'weather element

    What is meant by 'weather element" What is meant by 'weather element"
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    WHy OXygen can react with metal?

    WHy OXygen can react with metal?As i know , oxygen(O2) is bonded by covalent bond and it should be neutral charge. So how can the metal react with oxygen?
  20. N

    What is function of protease?

    Protease and Enzymes what is function of protease? IF it digests protein, then will it digest enzyme as enzymes are made of protein?
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    Infra rays question

    which one's infra rays wavelength are longer, sun or human body?
  22. N

    Is sound affected by gravity

    Is sound affected by gravity/
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    Osmosis is the passage of water from a region of high water

    Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration. .My question is why high water potential flows water to low water potential. What makes this occurs ? Also, does enzyme still works after being...
  24. N

    Difference between insolation and solar radiation

    Insolation.!!!what is it ? i mean what is the differnce between insolation and solar radiation.
  25. N

    Why do ppl suffered from famine always has a beer belly?

    why do ppl suffered from famine always has a beer belly?
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    Low composition of sodium in table salt?

    low composition of sodium in table salt???? today i went to supermarket for buying some food, and i discovered that some salt which is low amout of sodium??how can it be?as i learnt from chemistry , the ratio of sodium and chloride is 1 to 1 .
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    Covalent compound

    In covalent compound, what is the most number of shared electron between two atoms?
  28. N

    DNA and heredity

    i thought i got some refused thing.can DNA change?if they cannot change, why we dont like as a cave dweller or like a monkey?i mean the body .
  29. N

    Root VS mesophyll cells

    Which organelles do mesophyll cells have more than root cells of a plant? Do Onions have chloroplasts?
  30. N

    What is the function of ribosome?

    what is the function of ribosome,?
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