What piece of apparatus can be used to introduce more liquid into a reaction
and also serve as a pressure valve?
(A) Stopcock
(B) Pinchcock
(C) Thistle tube
(D) Flask
(E) Condenser
Which formulas could represent the empirical formula and the molecular
formula of a given compound?
(A) CH 2 O and C 4 H 6 O 4
(B) CHO and C 6 H 12 O 6
(C) CH 4 and C 5 H 12
(D) CH 2 and C 3 H 6
(E) CO and CO 2
The reaction
CH 4 + O 2 → CO 2 + H 2 Ocould be classified as