2007-03-27 06:40:18 · 8 answers · asked by mimi 1 in Science & Mathematics ➔ Chemistry
Combustion is primarily a chemical change, any physical change indicated would be indirect.
2007-03-27 06:58:10 · answer #1 · answered by g p 6 · 1⤊ 0⤋
Is Combustion A Chemical Change
2016-11-14 21:41:19 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Chemical.
Physical changes are those changes that do not result in the production of a new substance. If you melt a block of ice, you still have H2O at the end of the change. If you break a bottle, you still have glass. Painting a piece of wood will not make it stop being wood. Some common examples of physical changes are; melting, freezing, condensing, breaking, crushing, cutting, and bending. Special types of physical changes where any object changes state, such as when water freezes or evaporates, are sometimes called change of state operations.
Chemical changes, or chemical reactions, are changes that result in the production of another substance. When you burn a log in a fireplace, you are carrying out a chemical reaction that releases carbon. When you light your Bunsen burner in lab, you are carrying out a chemical reaction that produces water and carbon dioxide. Common examples of chemical changes that you may be somewhat familiar with are; digestion, respiration, photosynthesis, burning, and decomposition.
2007-03-27 06:48:43 · answer #3 · answered by mark my words 3 · 0⤊ 0⤋
Combustion or burning is a complex sequence of exothermic chemical reactions between a fuel and an oxidant accompanied by the production of heat or both heat and light in the form of either a glow or flames.
In a complete combustion reaction, a compound reacts with an oxidizing element, and the products are compounds of each element in the fuel with the oxidizing element.
2007-03-27 06:49:58 · answer #4 · answered by whymewhynow 5 · 0⤊ 0⤋
I believe it's chemical. The physical properties aren't changing, it's getting a whole new chemical make-up.
2007-03-27 06:43:26 · answer #5 · answered by Heather <33 4 · 0⤊ 0⤋
.
It is a physical and chemical change
A burning log doesn't look much the same after burning.
It has undergone both.
2007-03-27 06:45:33 · answer #6 · answered by Billy Butthead 7 · 0⤊ 0⤋
Chemical
a)New products are formed(CO2 on compustion of carbon compound)
b)there is change in mass.
c)irreversible*
*all physical chages are generaly reversible change ofstate is eg.
2007-03-27 06:44:50 · answer #7 · answered by pankaj t 2 · 0⤊ 0⤋
both liquid to gas and chemically changed particles
2007-03-27 06:43:05 · answer #8 · answered by Anonymous · 0⤊ 0⤋
chemical
2007-03-27 06:42:15 · answer #9 · answered by Anonymous · 2⤊ 0⤋