No well i am just telling you the answer i think because i went to a school that had chalk boards.
Chalk itself is not magnetic because it does not contain any magnetic properties. Magnetism is a property seen in materials like iron, nickel, and cobalt where the atoms have magnetic fields that line up. Chalk is primarily composed of calcium carbonate, which does not exhibit magnetic properties.
Simple: chalk dust has no magnetic properties whatsoever, and is an insulator. As such, the magnetic field will flow right past it as if it weren't there, so it cannot position itself accordingly.
For many schools, chalk is a required supply.
There is no statuary limit to the size of a chalkboard (better known as A blackboard in Britain schools, as it was a matt black board, and the chalk was white, sometimes coloured chalk was used).
See the Related Link. It has some information about the history of chalkboards used in schools.
It is difficult to provide an exact figure as it varies depending on the size of the school, number of students, and frequency of chalk use. However, a rough estimate is that an average school might use several boxes of chalk per year.
Chalk dust (calcium carbonate) is not magnetisable.
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Chalk
Chalk has no contraceptive properties.
A separation technique is something used to separate an object from it's mixture. For example, in a bowl you have chalk, chalk dust, salt, and paperclips. You'd use magnetic attraction to get the paperclips out. Then you'd use your hands and take out the chalk. And then, you use a sifting tool and it'll separate the salt and chalk dust by itself. But, another cool way to separate those two is to put them in water. The salt will eventually sink because it's denser than water, and the chalk dust will float because it is less dense. Other techniques are, filteration, sifitng, magnetic attraction, evaporation, chromotography. Hope that helped! :D
Chalk has many purposes. It can be used as a drying agent for gymnasts, rock climbers, and weightlifters. It is used in billiards (pool) on the tips of the pool cues. It can be made into sticks for writing on chalkboards. thats a really good answer dude -james27yocool