2006-09-18 23:10:29 · 13 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
coal is a substance which contains carbon,hydrogen and ash molecules in different proportions,
once we burn it, the hydrogen and carbon molecules react with the oxygen and escapes as vapors of H2O , CO2 and some CO too,
so three is reduction in the weight due to reduction in the amount of Hydrogen and Carbon..
2006-09-20 17:01:38 · answer #1 · answered by durai r 1 · 0⤊ 0⤋
Actually, it's an increase in weight if you can collect and weigh all of the smoke and add that weight to the remaining coal.
When you burn coal, the coal reacts with oxygen (oxidizes). During this process, some little bits of coal break off and join with the oxygen molecules, forming smoke. The weight of the ashes and the smoke will be the weight of the original coal as well as the weight of all of the oxygen consumed when the coal burns.
Smoke, however, usually drifts away. That's where all of the "missing weight" goes.
2006-09-19 06:23:55 · answer #2 · answered by yetanotheronlinename 2 · 0⤊ 0⤋
When coal is burnt, the carbon atoms (coal is mainly carbon along with other elements) combine with the Oxygen from the air to form CO2 gas or if there is less oxygen available, it forms CO which is deadly as, if inhaled in excess, it would react with the hoemoglobin in the blood to form oxyhoemoglobin and a person dies due to loss of oxygen.
The reaction with which carbon reacts with oxygen is called oxygen. After the reaction, some carbon particles get released as CO2 and thus there is loss in substance present in the coal and therefore... loss of weight!
2006-09-19 06:35:46 · answer #3 · answered by q&a_str8away 2 · 0⤊ 0⤋
Coal is the form of Carbon.
when coal is burnt, carbon molecules combine with that of Oxygen molecules to form carbon-dioxide.As CO2 is liberated, there is loss of weight, in the residue.
2006-09-19 10:54:35 · answer #4 · answered by Anonymous · 0⤊ 0⤋
When coal is burnt it releases carbon dioxide which causes the decrease in the weight due to gas release.
2006-09-19 06:20:08 · answer #5 · answered by kangaroo_rabbit_fellow 1 · 0⤊ 0⤋
The reaction is C+O2 -> CO2.
There's no change in mass but the CO2 is hotter than the O2 was so it takes up more volume and the boyance is therefore greater. So the apperant weight is less.
Of course if the CO2 is not weighted there's nothing but contamination (ashes) left.
2006-09-19 06:25:48 · answer #6 · answered by helene_thygesen 4 · 0⤊ 0⤋
coal that is a form of carbon after burning combine with oxygen and make carbon di oxide gas and burnt of in air
as carbon loss so weight of coal loss
2006-09-19 06:16:50 · answer #7 · answered by kapil g 2 · 1⤊ 0⤋
What you are weighing is not coal, but left over flyash. Oxidised remains of coal and hence its weight will naturally will decrease.
VR
2006-09-19 06:22:47 · answer #8 · answered by sarayu 7 · 0⤊ 0⤋
because they decompose.... burning is like decomposition
the molecules disintegrate. most of them converted to CO and CO2... as such the remaining coal will be lighter....
2006-09-19 07:10:39 · answer #9 · answered by teroy 4 · 0⤊ 0⤋
C + O2 --> CO2
coal oxygen carbondioxide
2006-09-19 08:19:22 · answer #10 · answered by vivian 1 · 0⤊ 0⤋