Properties of Gases

Questions

A.   Give two reasons why we fill the gas generator test tubes almost to the top with chemicals.

B.   What happens to the zinc in the hydrogen generation experiment?

Darkening of metal

C.   What happens to the manganese in the oxygen generation experiment?

Melding of separate bits

D.   Write a balanced equation for the reaction between O₂ and H₂.

O₂+2H₂=H₂O

E.   What is the function/purpose of the bromthymol blue in the CO₂ experiment?

The color changes in presence of solutions

F.    Bromothymol blue is blue in the presence of basic solutions, and yellow in the presence of acidic solutions. If your solution is a murky green, what might you assume about the solution?

Neutral

G.   Make a table of the gases studied. Tabulate their colors, the effect on lighted or glowing splints, and other properties one might use to identify them.

Sample table:

Gas	Flame reaction	Glowing splint	Limewater reaction	Bromthymol blue react.
Hydrogen		NA	NA	NA
Oxygen			NA	NA
Hydrogen & oxygen		NA	NA	NA
Carbon dioxide		NA
Alka Seltzer	NA
Breath	NA