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Write the equation for the reaction of Plaster of Paris with water.
Write the equation for the reaction of Plaster of Paris with water.
Previous Year Question Papers | Science
Write the equation for the reaction of Plaster of Paris with water.

CaSO4.1/2H2O + 3/2H2O = CaSO4.2H2O is the chemical equation for the reaction of Plaster of Paris and water. Heat is released when plaster of Paris reacts with water and crystallises. Plaster of Paris is heated to roughly 150 degrees Celsius to make gypsum.

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At a certain location in Africa, a compass points $12^{\circ}$ west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points above the horizontal. The horizontal component of the earth’s field is measured to be $0.16 \mathrm{G} .$ Specify the direction and magnitude of the earth’s field at the location.At a certain location in Africa, a compass points $12^{\circ}$ west of the geographic north. The north tip of the magnetic needle of a dip circle placed in the plane of magnetic meridian points above the horizontal. The horizontal component of the earth’s field is measured to be $0.16 \mathrm{G} .$ Specify the direction and magnitude of the earth’s field at the location.