10. Which is a practical application of freezing-point depression?
Heating a sidewalk to melt snow that falls onto it.
Sprinkling salt on Ice to make the Ice melt.
Chopping a block of ice into small pleces to make it melt faster.
Cooling a supersaturated sugar-and-water solution to form rock candy,

Crust,mantle,core,earth

c. electrical charges of ionic bonds.

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Following are the  advantages of the parametric equations: 1) they can be used to graph curves that are not functions, like the unit circle.2) the parameter can be used to represent the quantity that is  useful to  provide us with better information about the graph.3)  it is useful to convert between rectangular equations and parametric equations.with specific reference to chemistry,  parametric equations are employ for solving hydrogen and hydrogen-like ions, quantum mechanically. herein, cartesian coordinates are converted in spherical polar coordinates. the solution obtained, when plotted on spherical polar graph paper, provides visualization of atomic orbital such as s,p,d and f.