2007-12-14 05:13:34 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Hi ARZU.The correct ans is "A chalk consists of pores forming capillarities.when it is immersed in water,the water begins to rise in the capillarities & air present is expelled which goes out in the form of bubbles."
2007-12-15 06:05:02 · answer #1 · answered by Q 1 · 0⤊ 0⤋
Chalk is porous, which means that it contains empty spaces filled with air.
As the water gradually soaks in, the air is pushed out forming bubbles.
Also, since the surface is rough, sometimes air bubbles will adhere to the surface when it is submerged.
2007-12-14 13:19:56 · answer #2 · answered by Anonymous · 2⤊ 0⤋
Step into my Laboratory, Arzu. If you look at chalk through a magnifying glass you'll see that it's very porous. Air is trapped in those small areas. The air is floating to the top.
2007-12-14 13:18:48 · answer #3 · answered by Voice of Reason 5 · 2⤊ 0⤋
The chalk has actual air trapped inside. The air is suddenly released, causing the air bubbles.
Live long and prosper.
~Spockezri
2007-12-14 13:23:54 · answer #4 · answered by spockezri 3 · 2⤊ 0⤋
The carbonate in the chalk dissolves and evolves CO2 as bubbles.
2007-12-14 13:18:07 · answer #5 · answered by Matt 3 · 0⤊ 1⤋
^^^^^ He said water, not HCl. ^^^^^
There is air incorporated in the chalk. I you break a piece in half you will see pore spaces. Air is lighter than water, so when water infiltrates the pore spaces it pushes the air out and it rises to the top.
2007-12-14 13:18:24 · answer #6 · answered by Lady Geologist 7 · 2⤊ 0⤋