how does the gasoline became flammable?

Answer 1

Same way as everything else ... it is brought into intimate proximity with oxygen and a heat source.
In the case of gasoline vehicles, it is vapourized by the carburetor or the injector nozzle and mixed liberally with air before being compressed by the pistons and ignited by the spark plug (or the compression itself in the case of diesels).
In the case of gas explosives (FAEs and Molotov cocktails), the container is burst - either by impact or a bursting charge - creating a cloud of vapour mixed with ambient air, and then, fractionally later (or in the case of the Molotov, simultaneously), an igniter sets the cloud alight. Whooomp!
Of course, you can do the exact same thing with wood shavings, metal shavings (particularly magnesium and aluminum), or just about anything else that will burn readily when exposed to air and heat.
Cheers.

Answer 2

If you drop a match into gasoline does it explode?

No,it sizzles out just like it was dropped into water. However, a lot depends on how full the can was when you dropped in the match.
There can be a level of vapour in the can due to the covalent bond of the fuel ( that is why you can smell petrol as it has loose atoms) these atoms of fuel mix with the oygen and bind to become volotile and prone to ignition in the presence of spark or flame.
Thus in this case petrol is deemed flammable. The safe approach is to consider it always flammable and take proper precautions with naked flames, as often the vapour cannot be seen or estimated.

Answer 3

Gasoline, of course to know how/why it became flammable we must look on its chemical composition.

Gasoline are mostly made up of hydrocarbons which are considered hazardous substances and are regulated in the United States by OSHA. The MSDS (Material Safety Data Sheet) for unleaded gasoline shows at least fifteen hazardous chemicals occurring in various amounts from 5% to 35% by volume of gasoline. These include big names like benzene (up to 5% by volume), toluene (up to 35% by volume), naphthalene (up to 1% by volume), trimethylbenzene (up to 7% by volume), MTBE (up to 18% by volume) and about 10 others.

---Benzene
It is an organic chemical compound with the formula C6H6. It is sometimes abbreviated Ph-H. Benzene is a colorless and flammable liquid with a sweet smell and a relatively high melting point. It is carcinogenic and its use as additive in gasoline is now limited, but it is an important industrial solvent and precursor in the production of drugs, plastics, synthetic rubber, and dyes. Benzene is a natural constituent of crude oil, but it is usually synthesized from other compounds present in petroleum.

---Toluene
It is a clear, water-insoluble liquid with the typical smell of paint thinners, redolent of the sweet smell of the related compound benzene. It is an aromatic hydrocarbon that is widely used as an industrial feedstock and as a solvent. And is highly flammable.

---Naphthalene
It is is a crystalline, aromatic, white, solid hydrocarbon, best known as the primary ingredient of mothballs. Naphthalene is volatile, forming a flammable vapor. Its molecules consist of two fused benzene rings. It is manufactured from coal tar, and converted to phthalic anhydride for the manufacture of plastics, dyes and solvents.

---Trimethylbenzene
It is a colorless liquid with chemical formula C9H12. It is flammable aromatic hydrocarbon with a strong odor. It occurs naturally in coal tar and petroleum (about 3%). It is nearly insoluble in water, but well soluble in ethanol, diethyl ether, and benzene.

---Methyl tert-butyl ether (MTBE)
It is a chemical compound with molecular formula C5H12O. MTBE is a volatile, flammable and colorless liquid that is relatively soluble in water. MTBE has a typical odor reminiscent of diethyl ether, leading to unpleasant taste and odor in water. MTBE is used in organic chemistry as a cheap solvent with properties comparable to diethyl ether but with a higher boiling point and lower solubility in water. It is also used medically to dissolve gallstones.

Answer 4

when you mix with oxygen.

Answer 5

actually it's the fumes that ignite........

Answer 6

BY SPARK