A chemical reaction between X and Y forms С according to the reaction below. The data for three trials to measure the rate of this reaction are also given. X+Y → C

What is the rate law for this reaction?

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. 

You can look it up online and some images should pop up 

For a collision to be successful you need 2 different objects