Chem Lab #2

Experiment #3

Properties of Gases

PURPOSE

Investigate the physical and chemical properties of gases. Use these properties to identify gases.

DATA

Data Table: Experiment Results

Gas Flame

reaction Glowing

splint Limewater

reaction Bromothymol

blue reaction

Hydrogen Pop Extinguished Permanent bubbles None

Oxygen Intensifies Reignites None None

Hydrogen & oxygen Boom! Pop - -

Carbon dioxide Extinguished Extinguished Cloudy Turned Green

Alka Seltzer None Extinguished Slightly cloudy Turned yellow

Breath Intensifies Intensifies Very cloudy Slightly turned yellow

OBSERVATIONS

I found it very difficult to produce the 1/3 oxygen 2/3 hydrogen mixture. The wide mouth pipet kept losing the water when I tried to transfer. Also, in the CO2 experiment I found it difficult to get much gas to come through the stopper.

CALCULATIONS

Hydrogen and oxygen combustion reaction

2H2 + O2  2H2O

CONCLUSION/DISCUSSION

I felt that I learned to properly identify some basic gases as well as general techniques on how to extract them. Hydrogen pops with a flame, oxygen intensifies a flame, and carbon dioxide is cloudy in limewater and extinguishes a flame. I found the