Page 3 of 17 FirstFirst 1234513 ... LastLast
Results 31 to 45 of 254

Thread: 204 Simple Science Experiments ~ {ERG}

  1. #31
    SB Spearhead Field Marshal Rocky-10's Avatar
    Join Date
    Oct 2006
    Location
    ¤(¯`·._.» In Your Heart
    Posts
    77,016
    Rep Power
    100

    Default

    Grreat....
    Thanx for sharing.........



    Lucky is the man who is the first love of a woman,
    but luckier is the woman who is the last love of a man.

  2. #32
    SB Wizard Zorrow's Avatar
    Join Date
    Aug 2006
    Posts
    4,677
    Rep Power
    100

    Default

    
    12. Zig-zag growth



    Lay pre-germinated seeds on a sheet of blotting paper between two panes of glass, pull rubber bands around the panes and place in a water container in a window. Turn the glass panes with the shoots onto a different edge every two days. The roots always grow downwards and the stem grows upwards.

    Plants have characteristic tendencies. Their roots strive towards the middle of the earth and the shoots go in the opposite direction. On slopes the roots of trees do not grow at right angles to the surface into the ground, but in the direction of the middle of the earth.

  3. #33
    SB Wizard Zorrow's Avatar
    Join Date
    Aug 2006
    Posts
    4,677
    Rep Power
    100

    Default

    
    13.Leaf skeleton



    Place a leaf on blotting paper and tap it carefully with a clothes brush, without pressing too hard or moving sideways. The leaf is perforated until only the skeleton remains, and you can see the fine network of ribs and
    veins.

    The juicy cell tissue is driven out by the bristles and ****ed up by the blotting paper. The ribs and veins consist of the firmer and slightly lignified ( Cell walls strengthened and thickened ) framework and resist the brush.

  4. #34
    SB Wizard Zorrow's Avatar
    Join Date
    Aug 2006
    Posts
    4,677
    Rep Power
    100

    Default

    
    14. Two Coloured Flower



    Dilute red and green fountain pen inks with water and fill two glass tubes each with one colour. Split the stem of a flower with white petals, e.g. a dahlia, rose or carnation, and place one end in each tube. The fine veins of the plant soon become coloured, and after several hours the flower is half-red and half blue.

    The coloured liquid rises through the hair-fine channels by which, the water and food are transported. The dye is stored in the petals while most of the water is again given off.

  5. #35
    SB Wizard Zorrow's Avatar
    Join Date
    Aug 2006
    Posts
    4,677
    Rep Power
    100

    Default

    
    Chemistry



    15. Colour magic


    Cut a red cabbage leaf into small pieces and soak in a cup of boiling water. After half an hour pour the violet-coloured cabbage water into a glass. You can now use it for crazy colour magic. Place three glasses on the table, all apparently containing pure water. In fact only the first glass contains water, in the second is white vinegar and in the third water mixed with bicarbonate of soda. When you pour a little cabbage water into each glass, the first liquid remains violet, the second turns red
    and the third green. The violet cabbage dye has the property of turning red in acid liquids and green in alkaline. In neutral water it does not change colour. In chemistry one can find out whether a liquid is acid or alkaline by using similar detecting liquids (indicators).

  6. #36
    SB Wizard Zorrow's Avatar
    Join Date
    Aug 2006
    Posts
    4,677
    Rep Power
    100

    Default

    
    16. Violet becomes red



    If you ever come across an anthill in the woods, you can there and then do a small chemical experiment. Hold a violet flower, e.g. a bluebell, firmly over the ants. The insects feel threatened and spray a sharp smelling liquid over the flower.

    The places hit turn red. The ants make a corrosive protective liquid in their hindquarters. You notice it if an ant nips you, though it is generally quite harmless. Since the flower turns red where the drops fall, you know
    that they are acid. The acid is called formic acid.

  7. #37
    SB Wizard Captain krish.mukh's Avatar
    Join Date
    Nov 2007
    Location
    Bombay!!!!!
    Posts
    3,087
    Rep Power
    99

    Default


  8. #38
    New Born
    Join Date
    Jan 2008
    Posts
    195
    Rep Power
    97

    Default

    nice one...................

  9. #39
    SB Wizard Zorrow's Avatar
    Join Date
    Aug 2006
    Posts
    4,677
    Rep Power
    100

    Default

    
    17. Invisible ink



    If you ever want to write a secret message on paper, simply use vinegar, lemon, or onion juice, as the invisible ink. Write with it as usual on white writing paper. After it dries the writing is invisible. The person who receives the letter must know that the paper has to be held over a candle flame: the writing turns brown and is clearly visible.

    Vinegar, and lemon or onion juice, cause a chemical change in the paper to a sub- stance’ similar to cellophane. Because its ignition temperature is lower than that of the paper, the parts written on singe.

  10. #40
    SB Wizard Zorrow's Avatar
    Join Date
    Aug 2006
    Posts
    4,677
    Rep Power
    100

    Default

    
    18. Bleached rose



    A piece of sulfur is ignited in a jam jar. Since a pungent vapor is produced, you should do the experiment out-of-doors. Hold a red rose in the jar. The color of the flower becomes visibly paler until it is white.

    When sulfur is burned, sulfur dioxide is formed. As well as its germicidal action in sterilization, the gas has a bleaching effect, and the dye of the flower is destroyed by it. Sulfur dioxide also destroys the chlorophyll of plants, which explains their poor growth in industrial areas, where the gas
    pollutes the air.

  11. #41
    SB Addict DJ6's Avatar
    Join Date
    Sep 2007
    Location
    Lost in here
    Posts
    501
    Rep Power
    100

    Default

    very nice information brother. thanks

  12. #42
    SB Wizard Zorrow's Avatar
    Join Date
    Aug 2006
    Posts
    4,677
    Rep Power
    100

    Default

    
    19. Transfer pictures



    Photos and drawings from newspapers can be copied easily. Mix two spoonfuls of water one spoonful of turpentine and one spoonful of liquid detergent and dab this liquid with a sponge on the newspaper page.

    Lay a piece of writing paper on top, and after vigorous rubbing with a spoon the picture is clearly transferred to the paper.

    Turpentine and liquid detergent when mixed form an emulsion, which penetrates between the dye and oil particles of the dry printing ink and make it liquid again. Only newspaper printing ink can be dissolved, though.

  13. #43
    SB Wizard Zorrow's Avatar
    Join Date
    Aug 2006
    Posts
    4,677
    Rep Power
    100

    Default

    
    20. Sugar fire

    

    Place a piece of cube sugar on a tin lid and try to set it alight.

    You will not succeed. However, if you dab a corner of the cube with a trace of cigarette ash and hold a burning match there, the sugar begins to burn with a blue flame until it is completely gone.

    Cigarette ash and sugar cannot be separately ignited, but the ash initiates the combustion of the sugar. We call a substance, which brings about a chemical reaction, without itself being changed a catalyst.

  14. #44
    Machinehead Lieutenant General ignoramusenator's Avatar
    Join Date
    Jan 2007
    Location
    Neverland
    Posts
    53,741
    Rep Power
    100

    Default



    Reputations Sir !


    Make My Day

  15. #45
    SB Wizard Zorrow's Avatar
    Join Date
    Aug 2006
    Posts
    4,677
    Rep Power
    100

    Default

    
    21. Jet of flame



    Light a candle, let it burn for a while, and blow it out again. White smoke rises from the wick. If you hold a burning match in the smoke, a jet of flame shoots down to the wick, and it re-lights.

    After the flame is blown out the steam is still so hot that it continues to evaporate and produce a vapor. But as this is combustible, it can be re-lighted at once by a naked flame. The experiment shows that solid substances first become gaseous at the surface before they will burn in a supply of oxygen.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •