EVERYDAY SCIENCE

Detailed explanation-1: -As the chain length (numbers of carbons) increases the melting and boiling points of the alkanes gradually increase for these compounds. The reason that longer chain molecules have higher boiling points is that longer chain molecules become wrapped around and enmeshed in each other much like the strands of spaghetti.

Detailed explanation-2: -Longer hydrocarbon molecules have a stronger intermolecular force. More energy is needed to move them apart so they have higher boiling points . This makes them less volatile and therefore less flammable .

Detailed explanation-3: -As the hydrocarbon chain length increases, boiling point increases. As the hydrocarbon chain length increases, viscosity increases. As the hydrocarbon chain length increases, flammability decreases. hydrogen in the fuels are oxidised, releasing carbon dioxide, water and energy.

Detailed explanation-4: -The normal alkane has the highest boiling point. The physical properties of a series of cycloalkanes of increasing molecular weight are similar to those of a series of alkanes.

Detailed explanation-5: -Vapours from the oil rise through the column and condense when the temperature of their boiling point is reached. Longer hydrocarbons have higher boiling points than shorter hydrocarbons because they form stronger intermolecular forces between hydrocarbon molecules.