How come when i have a a test tube half filled with acetylene and when it reacts with oxygen black residue (carbon) is produced on the top of the test tube. Whereas when I have a test tube full of acetylene reacting with oxygen the whole test tube gets black residue.
These are both incomplete combustions
2007-01-17 10:52:30 · 5 answers · asked by footballer1001 1 in Science & Mathematics ➔ Chemistry
How do you half fill a tube with acetylene? It's a gas.
2007-01-17 10:59:05 · answer #1 · answered by Phil 5 · 1⤊ 0⤋
With the whole test tube the C2H2 tries to burn all at the same time and you get the C left as black all the way.
With half a tube of C2H2 half of the tube is air so there is more oxygen and the combuston is only incomplete at the edges.
2007-01-17 18:58:51 · answer #2 · answered by science teacher 7 · 0⤊ 0⤋
Judging from the days watching my dad use his Oxy Acetylene torch to cut steel, the residue is caused by the Acetylene. A much higher ratio of Oxygen to acetylene is necessary to accomplish a clean burn.
2007-01-17 18:59:05 · answer #3 · answered by ldeweyjr 2 · 0⤊ 0⤋
You need a complete combustion to generate the CO2. It seems that you need a better mixing action in your test tube.
2007-01-17 18:58:02 · answer #4 · answered by reb1240 7 · 0⤊ 0⤋
C2H2 tries to burn at same time that's why
2007-01-17 19:11:10 · answer #5 · answered by RickySingh2006 2 · 0⤊ 0⤋