I have a chem lab report due this week, and one question is giving me a hard time.
APPARATUS: Stand, two test tubes of different diameter, test tube holder, clamp, flame stick, safety equipment, zinc, hydrochloric acid and balance.
PROCEDURE: Arrange the apparatus according to the model shown in the lab. Once approved, a small amount of hydrochloric acid will be placed in the larger test tube. Obtain a small amount of zinc (1.21 g) and insert into the test tube. Allow about 30 seconds for the chemical reaction to take place. Place the test tube holder about one third the distance from the base of the smaller test tube. Invert this tube and place inside the larger test tube and wait about 45 seconds before removing the smaller test tube. Ignite a flame stick and immediately insert into the inverted test tube. Observe the reaction. Repeat this activity until the reaction diminishes.
Basically what I observed was when we put a flame in the upside-down tube, it made a loud popping sound and it burnt out.
What we're supposed to list is
factors suggesting that hydrogen was produced during the lab. My teacher says we're supposed to have at least
five.
The only one I know is that hydrogen reacts explosively with a flame, where as if there was oxygen in the tube for example the flame wouldn't have gone out, and if there was CO
2 produced or something, you wouldn't have gotten the loud pop.
I need four more, and I really don't know.
help?