Oxygen
yes charring of wood is chemical change
Black or brown but is another chemical is mixed it can turn different colours
Burning wood. When the wood is burned, it becomes black.
A diesel puts out Black smoke when it is running Too Rich. Blue means Burning Oil, white is a Coolant leak (Blown head gasket). Black actually means it's wasting Fuel.
Black smoke is just unburnt fuel in a diesel if the vehicle is not modified in any way to make this happen then something is causing it to not burn it all, it will not harm it but you should figure out why its not burning all of its fuel. (most diesels will spit out a little black smoke)
blown turbo - worn turbo bearing causing oil to suck through and into exhaust manifold - results in no power and neat oil burning in the exhaust - major black smoke
Only on cold startup (diesel engine) it can be normal to get little black smoke, as long as it doesn't continue. If it continues after warm up that could indicate engine wear. I'd recommend a mechanical inspection. The newer common rail diesels though are generally cleaner burning than older engines.
The black smoke produced from a burning candle is a physical change. This is because the change in appearance (from no smoke to black smoke) does not involve a change in the chemical composition of the candle wax or the oxygen in the air. The black smoke is primarily made up of tiny carbon particles that result from incomplete combustion of the candle wax.
Black diesel, often referred to as biodiesel or waste vegetable oil diesel, is made by converting used cooking oil or animal fats into a usable fuel. The process involves filtering the oil to remove food particles, then mixing it with methanol and a catalyst (usually sodium hydroxide or potassium hydroxide) to facilitate a chemical reaction called transesterification. This reaction separates the glycerin from the fatty acids, resulting in biodiesel and glycerin byproducts. The biodiesel can then be used directly in diesel engines or blended with regular diesel fuel.
A dark or black porous carbon prepared from vegetable or animal substances.
Black smoke, from any diesel, is the result of partially burned fuel. Overfueling will cause black smoke.
its a diesel, you will see black smoke alot.