4 Al(s) + 3 0,(g) → 2 A1,03 4. What type of reaction is the one above?
A. Single replacement
B. Double replacement
C. Combination aka synthesis
D. Decomposition
E. Organic combustion

PLEASE HELP

The correct answer is c. orbital shape. "the angular momentum quantum number l describes the shape of an orbital. it corresponds to each orbital type, i.e. (0,1,2,−1)=(s,p,d,f,g,"

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).