A sample of gas in a small test tube produces a pop when a burning splint is inserted. Which gas could is be?
A-H2
B-O2
C-Cl2
D- CO2

Hey how did you manage to type such a big lab report

Its the second one nonmetals are moldable and easily shaped 

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).