becouse these plants may not originally contain these substances in them, or do thay?
2006-09-03 08:37:35 · 5 answers · asked by jesu 2 in Science & Mathematics ➔ Biology
Because when the hydrogen, oxygen and carbon have been burned away, there are still trace amounts of nitrogen, calcium, silicon, phosphorus, zinc, magnesium and a bunch of other elements that have not burned away.
2006-09-03 08:42:15 · answer #1 · answered by cdf-rom 7 · 0⤊ 0⤋
Pine wood has a sap that is very sticky .... not sure if you can call it Tar ... But it burns very bright and is great for BBQ's..
Also Silver Burch tree in the summer has a very sweet sugar type sap that is very nice to drink ,,, but is also very flammable , Still not sure if you can call this a Tar ...as Tar is a Residue left from burnt wood ..etc.
2006-09-03 15:50:29 · answer #2 · answered by Anonymous · 0⤊ 0⤋
The tar you are referring to is a complex mixture of (mostly) carbon compounds produced by high temperature pyrolysis reactions. It will vary in composition considerably with the type of plant.
2006-09-03 15:48:15 · answer #3 · answered by Richard 7 · 0⤊ 0⤋
"Tar" is the product of incomplete combustion of organic molecules. Therefore, anything made of/containing organic molecules will produce "tar" if heated without enough oxygen to oxidise all of it.
2006-09-03 15:50:24 · answer #4 · answered by Anonymous · 0⤊ 0⤋
i think its the burnt chlorophyll in them
2006-09-03 15:44:13 · answer #5 · answered by teeeck5 3 · 0⤊ 0⤋