When wood burns, the fibrous structure of the wood is lost; even if the chemical reaction could be reversed, the information contained in the physical arrangement of the original wood no longer exists. Wood has a shape, ashes do not.
The Third Law of Motion, which states that for a given force, there is an equal reaction force. Burned fuel exits a rocket's backside, and the rocket moves forward.
Evaporation, e.g. when the heat makes a puddle disappear. Combustion, e.g. when a fuel is burned. Both times it's not gone. It's just.. changed.
You can also get burned by extreme cold!
When fossil fuels are burned, they release energy stored years ago.
New molecules are formed.
ember
The result of this procedure is permanent and cannot be reversed.
Neither. Flame is a mixture of air and partially burned material.
Blower motor speed resistor is partially burned out.
They are burned with oxygen to produce energy.
No, it's a chemical change. A physical change is one which can be reversed. Like ice to water to ice etc.
fuel
Black smoke, from any diesel, is the result of partially burned fuel. Overfueling will cause black smoke.
tiny black pieces you see after something is burned
A Combustion Reaction
heat energy
Dust and soot. "Dust" are fine particles of rock that can be caused by weathering, wind, or meteors burning up in the atmosphere. "Soot" is partially-burned hydrocarbons that result from burning something organic, like wood, coal or oil.