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Reisa Matsuda
10/18/12
Chemistry 2B Onions
Gases Lab
Aim
To find out how different substances react with one another to form new
substances
...
2
...
4
...
Gas
Oxygen (O2)
Nitrogen
Dioxide (NO2)
Ammonia (NH3)
Carbon Dioxide
(CO2)
Observations
Preparation
Test
H2O2 liquid bubbles up and
O2 from test tube made
becomes a black, bubbly liquid
...
The presence of oxygen was tested using a glowing wood splint
...
These
bubbles represent oxygen gas
...
The test was therefore positive
...
Our first example was the second test,
nitrogen dioxide
...
When we put the paper near the mouth of the test tube
(where the NO2 gas was being released), the paper turned red
...
The lead nitrate started out as a white powder,
but turned into a yellow-orange solid afterwards
...
Ammonia is one of the few basic gases
...
When we tested the gas with a piece of damp
phenolphthalein paper, the paper turned bluish purple
...
We knew the gas being
released from the test tube was ammonia from its unique, strong smell
...
First, CO2 gas was released by adding
sodium carbonate and hydrochloric acid
...
We collected some of this CO2 gas using a
small dropper (without touching the liquid) and bubbled the gas out through
the lime water
...
The test of hydrogen was prepared by reacting an acid (2HCl) with a reactive
metal(Mg)
...
When a lighted splint was
brought near the mouth of the tube, there was a small explosion along with a
popping sound
...
This
is a positive test for H2