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9) A log of wood will prevent someone from sinking in water. This is because, the density of wood is less than that of water .
10) We call substances that dissolve in water soluble material. Sugar and salt are examples of soluble material
Substances that do not dissolve in water are called insoluble material. Sand and flour are examples of insoluble material.
11) (a) Appearance
(b) Hardness
(c) Solubility
(d) Float or sink in water
(e) Transparency
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