How does the conductance of a semiconducting material change with rise in temperature?

How does conductivity of a semi conductor change with the rise in temperature ?

How does the conductivity of semi-conductors varies with the rise in their temperature ?

Why does conductivity of a semiconductor increase with rise in temperature?

How ionic product of water change with temperature ?

Why does the rate of a reaction increase with rise in temperature?

Why Manganin is used to make standard resistance coil ? How does the electric resistance of metal varies with the rise in its temperature ?