Chalk can be made by stirring together calcium carbonate and clay, or it can be manufactured by molding. Chalk is made mostly of limestone or gypsum.Know More
Extruded chalk is made by stirring calcium carbonate, color pigment, clay and a binding agent to form a doughy material, which is then pressed into cylindrical shapes and cut into sticks of chalk. This type of chalk is dustless, meaning that the dust doesn't travel through the air. It is typically used as blackboard chalk.
Molded chalk is not dustless and is made by mixing dry pigment, water and plaster. The chalk is then molded into sticks and kiln-dried.
Chalk is formed naturally from limestone, a sedimentary rock that is made of calcium carbonate. It also forms from gypsum, a mineral known as calcium sulfate that is formed from the residue of evaporated water.Learn more about Toys
Chalk is calcium carbonate and has the same chemical composition as limestone, marble, ground calcium carbonate and precipitated calcium carbonate. Chalk, like the other types of calcium carbonate, is in the form of calcite, which is a crystal.Full Answer >
The most common chemical formulas for chalk are CaCO3 (calcium carbonate) and CaO (calcium oxide). Chalk is a soft, porous sedimentary rock that is a form of limestone and is mainly composed of calcite (calcium carbonate).Full Answer >
Barbie dolls are made up of soft plastics, and while permanent marker has been known to create irreversible damage, there are some materials, such as rubbing alcohol, that have been proven to erase the marker from select surfaces. Removing permanent marker stains should be done on a trial-and-error basis.Full Answer >
Hot Wheels cars are made in various factories in the People's Republic of China. They are then exported to the United States, where they are sold at stores nationwide.Full Answer >