Which of the four elements is a flame?
146566
A flame is a mixture of gases undergoing a chemical reaction that gives off enough heat to continue the reaction in the molecules that have not yet reacted.  We get the impression that solids (like wood) burn, but it's really mainly the gases coming off of them that burn.  That's why it's easier to start a hot piece of wood on fire than a cold piece of wood.  The initial piece has to be hot enough so that the flamable products escape from it in vapor form.
880114
flare up bigger than normal..\noxygen is not flammable..but the presence of it is needed for combustion\n\nCH4 + 2O2 --> CO2 + 2H2O\n\nwith burning in atmosphere, the flame is smaller because of incomplete burning,*there is only about 21% of oxygen in atmosphere..
346788
Mg(s) + H20(l) -----> MgOH2 + 1/2 H2\n\nThe magnesium reacts with water in a violently exothermic reaction.  It forms a compound of magnesium hydroxide consisting of one Mg(2+) ion and two hydroxyl ions OH(-) and one half mole of H2 gas is evolved, which is where the sparks and flames come from.
552992
ch4 for both.\nOne carbon atom and 4 hydrogen atoms. Simple!
15337
The inner most part and the outer most part of the flame
977182
Who cares, all flames are hot.\n\n"The color and temperature of a flame are dependent on the type of fuel involved in the combustion."
176836
Hello,\nPottasium = lilac flame.\nCalcium = Brick red flame, not green flame.\nSulphur = Bright blue flame\nHydrogen = Pale blue flame (Hydrogen isnt a metal though)\nSodium = Golden flame.\nPhosphorus = White fumes.\nMagnesium = dazzling white light.\nOk, thats all that strikes my mind now...
847442
Since there are no metallic ions like sodium or copper to produce intense visible light wavelength emissions, I would suspect that the flame would be colorless or the kind of yellow flame you see at natural gas flaring.  I've not done this experiment (it's pretty hazardous).
762171
It has to do with where the balance of the gasses give the highest rate of combustion. The oxidizing part of the flame has excess oxygen in relation to fuel. That means the oxygen in excess is not reacting with fuel to produce heat. In the reducing part of the flame there is excess_____ ..... and you should be able to figure out the rest.\n\nAn extra hint: the actual hottest part of the flame is where the most O2 can find the most fuel,  if there is to much O2 in the mixture it will not burn, same as if there is not enough O2(to much fuel).
94473
a compound has diferent properties to the elements thet make it up(usually)\n\nlike table salt, sodium- a slightly harmful reactive metal\n                 chlorine- a poisenous gas\n\nbut put them together and it flavours you food and you eat it\n\nwater stops the combustion reaction
944324
Fire is a process of Oxidation.  \n\nIt's temperature is equal to or greater than the Auto-Ignition Point for the fuel substance.  Each Fuel will have it's own unique Auto-Ignition Point.\n\nIt's color is determined by the elements present, and the visual spectrum of thier discharge photons...  Photons are discharge as the electrons jump from high to lower excitation levels, and each element has it's own color signature.\n\nMost fires are orange yellow and white because of the large ammount of Hydrogen in the combustion process of organic (or formerly) material.  Occasionally Red will come out thans to the carbon of the same.\n\nIf you add powered metals to the mix your flame will change color.  Copper makes a pretty green for instance...
617094
Probably some of the aluminum caught fire in the fireball from the burning hydrogen.  If so, the reaction would be:\n\n4 Al +  3 O2 =====> 2 Al2O3
1181278
When atoms (elements) are chemically combined to form molecules the combination makes an new substance with characteristics very different than each separate element.  Water extinguishes fire because it reduces heat and oxygen.  The fire does not break up the water molecules to form free hydrogen and oxygen.
981635
"These substances" refers to what?\n\nThe product of combustion include the oxides of carbon-mono and di, water vapor, unburned hydrocarbons and mineral ash.
560162
Fire is the rapid combination of oxygen with fuel in the presence of heat, typically characterized by flame, a body of incandescent gas that contains and sustains the reaction and emits light and heat. (from www.straightdope.com)\n\nThe typical, bright, yellowish-orange upper part of a flame is due to the heating of unburned carbon particles.\n\nThe temperature of the fire and the material being burned are the factors that determine the color of the flame. The various colors of flames in a wood fire are due to the different substances in the flames.
534537
1 Hydrogen 2 Helium 3 Lithium 4 Beryllium 5 Boron. 6 Carbon 7 Nitrogen 8 Oxygen 9 Fluorine 10 Neon
460409
Just guess what the colors would be for different compounds before you actually do the flame test for the hypothesis.  \nOr you could guess whether it is the cation (the positively charged metal ion) or the nonmetal anion that is responsible for the different colors.