Salts, Crystals and Their Uses in Daily Life (3)

Chemistry

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Physical properties of salt crystal (5)

Has a specific geometrical shape such as cube, cuboid, rhombus and prism

Physical properties of salt crystal (6)

Different crystals have different geometrical shapes

Physical properties of salt crystal (7)

Same crystals of different sizes still have the same geometrical shapes

Uses of ammonium nitrate, NH4NO3 in agriculture

Ammonium nitrate, NH4NO3 as fertiliser

Uses of iron(II) sulphate, FeSO4 in agriculture

Iron(II) sulphate, FeSO4 is used in pesticides to kill pests and grass

Uses of calcium sulphate, CaSO4 in medicine

Calcium sulphate, CaSO4 as plaster of Paris to support broken bones

Uses of potassium manganate(VII) in medicine field

Potassium manganate(VII) is used as antiseptic to treat wounds

Uses of sodium chloride, NaCl in food preparation

Sodium chloride, NaCl is used as flavour

Uses of sodium bicarbonate, NaHCO3 in food preparation

Sodium bicarbonate, NaHCO3 is used for raising dough

Uses of sodium benzoate, C6H5COON in field of preservation

Sodium benzoate, C6H5COONa is used to preserve chilli sauce, tomato sauce and oyster sauce

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