Science Experiments Ideas
101 Science Experiments Ideas ,Fun Science Experiments for Kids - Cool Projects & Easy Ideas.
11. Rain in a jar
Place a green twig in a glass of water in sunlight. Pour a layer
of oil on to the surface of the water and invert a large jar over
the lot. After a short time, drops of water collect on the walls
of the jar. Since the oil is impermeable, the water must come
from the leaves. In fact the water which the plant absorbs is
given off into the air through tiny pores in the epidermis of
the leaf. Air saturated with moisture and warmed by the sun
deposits drops like fine rain on the cool glass.
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.
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.
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 sucked up by the blotting paper. The ribs and veins consist of the firmer and slightly lignified framework and resist the brush.
The juicy cell tissue is driven out by the bristles and sucked up by the blotting paper. The ribs and veins consist of the firmer and slightly lignified framework and resist the brush.
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.
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.
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.
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.
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.
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.
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.
18. Bleached rose
A piece of sulphur is ignited in a jam jar. Since a pungent vapour
is produced, you should do the experiment out of doors. Hold
a red rose in the jar. The colour of the flower becomes visibly
paler until it is white.
When sulphur is burned, sulphur dioxide is formed. As well as its germicidal action in sterilisation, the gas has a bleaching effect, and the dye of the flower is destroyed by it. Sulphur dioxide also destroys the chlorophyll of plants, which explains their poor growth in industrial areas, where the gas pollutes the air.
When sulphur is burned, sulphur dioxide is formed. As well as its germicidal action in sterilisation, the gas has a bleaching effect, and the dye of the flower is destroyed by it. Sulphur dioxide also destroys the chlorophyll of plants, which explains their poor growth in industrial areas, where the gas pollutes the air.
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.
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.
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.
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.
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