Question 21 1 pts
5H2O2(aq) + 2 MnO4 (aq) + 6H+(aq) --> 2Mn2+(aq) + 8H2O(l) + 5O2(g)
In this reaction, which element is being oxidized and what is the element's change in oxidation
number?
O Oxygen, which changes from 0 to -2.
O Oxygen, which changes from 1 to 0.
O Manganese, which changes from -1 to +2.
O Manganese, which changes from +7 to +2.
1 pts
Question 22

Wind will blow from one direction to another.

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. 

Um i think answer is a