Is the formation of CO2(g) from its elements endothermic or exothermic? Exothermic because the ΔH is negative.

Endothermic because the ΔH is negative.

Endothermic because the ΔH is positive.

Exothermic because the ΔH is positive.

Outermost (valence) electrons

Qand k are only the same when the forward rate of the reaction has reached zero.

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.