Clean the chalkboard with warm water and vinegar. After the chalkboard has been wiped with the water and vinegar solution, wipe the board with a dry cloth.
a chalk board
If you erase the board, then use a wet paper towel to remove the rest of it, you'll have a sparkly board ;)
near a chalk board
The method you will use to clean off chalk will depend on where the chalk is. Sidewalk chalk can be washed away from sidewalks with a hose.
Chalk
The Luhya translation of the English words 'chalk board' is "lisisi lie ichoka".
Chalk is used on the black board because chalk is easy to write with on a black board.
Use a wet towel or sponge. put a few drops of detergent in the water. After the (slate0 board is dry, chalk it by rubbing the side of a stick of chalk all over it then erase it with a felt eraser.
Nature's chalk is limestone--hard. Blackboard chalk is soft--gypsum.
5x2x1.5
It would be an insulator- chalk board erasers normally consist of two parts, a wooden handle and a soft pad that wipes off the chalk from the board. Neither of these parts are conductors of electricity.
Chalk is Calcium Carbonate, aka CaCO3, so it's only one substance.