2006-11-19 23:24:07 · 3 answers · asked by shefae_junzhar 1 in Science & Mathematics ➔ Chemistry
With the air holes closed, there is a shortage of oxygen and the hydrocarbons in the gas do not burn completely. Some carbon is not burnt resulting in soot
2006-11-19 23:35:07 · answer #1 · answered by amania_r 7 · 0⤊ 0⤋
soot is present because there is incomplete combustion, in combustion hyrdocarbons react with oxygen to form carbondioxide gas plus other compounds depending on their chemical composition. when the air hole of say a bunsen burner is open, and the airlow is efficient almost all the hydrocarbons which are mostly of this form (CHn)m, where m and n are intergers decompose to form carbondioxide. when closed the combustion is incomplete and and soot is a product of inefficient combustion.
2006-11-20 07:54:34 · answer #2 · answered by evets 2 · 0⤊ 0⤋
a flame is a chemical reaction. what you see as flame is nothing but but very hot soot. so soot will be present.
2006-11-20 07:27:48 · answer #3 · answered by Anonymous · 0⤊ 0⤋