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(a) Give the chemical name and formula of Plaster of Paris.
(b) Write the chemical equation of its preparation.
(c) Give any two uses of it.
(b) Write the chemical equation of its preparation.
(c) Give any two uses of it.
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(a) • Calcium sulphate hemihydrate (½ Mark)
• $\ce{CaSO4.1/2H2O}$ (½ Mark)
(b) $\ce{CaSO4.2H2O ->[373K] CaSO4.1/2H2O + 3/2H2O}$ (1 Mark)
(c) Plaster of Paris is used for
• making toys (½ Mark)
• to support fractured bones in right position. (½ Mark)
(or any other two uses)
• $\ce{CaSO4.1/2H2O}$ (½ Mark)
(b) $\ce{CaSO4.2H2O ->[373K] CaSO4.1/2H2O + 3/2H2O}$ (1 Mark)
(c) Plaster of Paris is used for
• making toys (½ Mark)
• to support fractured bones in right position. (½ Mark)
(or any other two uses)