For a reaction between oxygen molecule and hydrogen molecule to take place the bond between the two oxygen atom in O2 and the two hydrogen atom in H2 is required to be breaked. For this process a high temperature is needed which is not possible at room temperature.
Since no bond breaks to make an reacting atom, the reaction does not takes place at room temperature
Energy!
Methane is a stable molecule and oxygen is almost (pretty) stable. The there is sufficient energy, called activiation energy, then the two gases will react
because the chemicals bond are too strong.
The energy by surrounding is not sufficient to overcome the activation energy of this free radical reaction.
Metal ions catalyse the reaction
Chloromethane is the product that is formed when methane and chlorine react with each other. Dichloromethane is another product that can also be formed when methane and chlorine react.
Theotically, methane can't react with Cl2 in shade as UV light is required to initiate the substitution reaction. Only when there is Cl2 can the C-H bond be broken. However, alkene can react directly with Cl2 due to hydrohalogenation.
Ultraviolet Light
CH4 + Br2 --> CH3Br + HBr
Metal ions catalyse the reaction
The reaction between methane and bromine is a photochemical reaction. Refer to the related link below.
Methane does not react with chlorine in the dark.
Chloromethane is the product that is formed when methane and chlorine react with each other. Dichloromethane is another product that can also be formed when methane and chlorine react.
It undergoes substitution reaction reaction in presence of sunlight by forming four different product like chloroform,carbon tetrachloride etc.................
The product of a reaction with chlorine gas, Cl2, depends on the other reactant. Here are just a few examples of the many, many different possible reactions: A reaction between chlorine and hydrogen gas, H2, results in hydrogen chloride, HCl, which forms hydrochloric acid, the same acid found in the stomach, when mixed with water. A reaction between chlorine and sodium metal, Na, results in sodium chloride, NaCl, commonly known as table salt. Chloroform, CCl3, a chemical formerly used as an anesthetic, can result from a reaction between chlorine gas and methane, CH4. When mixed with sodium hydroxide, NaOH, chlorine gas forms hypochlorite, ClO3-, a major component of bleach.
Burning release heat, the molecular structure of methane is destroyed and the bonding energy is released.
sodalime has no reaction with methane
Reaction of combustion of methane will give off lot of energy. In any combustion reaction there will always be formation of water vapor and heat. Methane + oxygen = combustion reaction.
Theotically, methane can't react with Cl2 in shade as UV light is required to initiate the substitution reaction. Only when there is Cl2 can the C-H bond be broken. However, alkene can react directly with Cl2 due to hydrohalogenation.
Methane gas is a compound; you think probable to the combustion of methane.
This reaction between methane and bromine happens in the presence of ultraviolet light - typically sunlight. CH4 + Br2CH3Br + HBrThe organic product is bromomethane.