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Why is heat of combustion of alkynes higher than that of alkanes and alkenes?
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Why does flammability of alkenes decrease?
the flammability of alkanes decreases as the hydrocarbon chains increase in length their evapouration rates decrease as longer chained molecules have higher boling points so temperatures must be high for them to evaporate therefore there is no fumes or vapours for longer chained alkanes at room temp like nonane and so on these hydrocarbons need higher temp to produce vapours n therefore will not burn with just a match
Why charcoal have high value of heat combustion than petrol?
Petrol has a higher value of the heat of combustion.
Is pressurized oxygen combustible?
Oxygen is neither combustible nor explosive, it is merely the chemical needed for combustion to take place. As such, the higher the concentration of oxygen, the higher the rate of combustion, provided that combustible material is present.
How the melting point of alkenes can be increase by increasing molecular mass?
Melting points are determined by the strength of interaction between molecules in a solid. The greater the force of interaction, the higher the melting point. Molecular interactions are the result of the attraction between partially charged molecules or ions in a solid. Alkenes have little or no charge; they are nonpolar. In order for alkenes to stick to each other in a solid, they need to have partial charge induced randomly. This is known as London Dispersion Force. The probability of a partial charge occurring is increased when the size of a molecule's electron cloud increases. Bigger alkenes have bigger electron clouds, and thus have more powerful London dispersion force. More intermolecular force means higher melting points.
What are Saw-Tooth pattern and Alternation Effect wrt melting points of straight chain alkanes?
The Saw-Tooth pattern represents the crystal lattice of straight chain alkanes with terminal ends lying in the same side while the alternation effect shows how the melting point from odd to even positions of carbon atoms is higher than from even to odd Carbon atoms.
Why does flammability of alkenes decrease?
the flammability of alkanes decreases as the hydrocarbon chains increase in length their evapouration rates decrease as longer chained molecules have higher boling points so temperatures must be high for them to evaporate therefore there is no fumes or vapours for longer chained alkanes at room temp like nonane and so on these hydrocarbons need higher temp to produce vapours n therefore will not burn with just a match
What are the product of completely combustion of alkene?
Complete oxidation of alkanes by oxygen yeilds carbon dioxide and water. Alkanes oxidation by O2, (CxH2x+2) + O2 = x CO2 + x+1 H2O. With Halogens it would be CyH2y+2 + X2 = CyX2y+2 + (y+2) HX. Carbon Carbon bonds often do not break in halogen oxidation. "often"
What is the similitries between Alkanes Alkenes and Alkynes?
Alkanes have single bonds while Alkenes have double bonds.CnH2n+2 is the general formula for alkanes.CnH2n is the general formula for alkenes.
Which has higher boiling point aldehyde or ketone?
the alkanes are saturated and contains more atoms so therefore contain more electrons this results in stronger dispersion forces the alkenes and unsaturated contain less atoms less electrons weaker dispersion force compared to the alkane
Describe the combustion characteristics of heptane and pentene?
The combustion of heptane and pentene will differ in that because pentene is an alkene, it is more likely to experience incomplete combustion because of the higher ratio of carbon to hydrogen than in alkanes. Some carbon will not be oxidized fully and will make soot. Heptane will have a higher heat of combustion than pentene because it has more bonds to be broken.
Why higher density air is better for combustion?
The higher the air density, the more oxygen available for combustion.
Why charcoal have high value of heat combustion than petrol?
Petrol has a higher value of the heat of combustion.
Why does complete combustion release more energy than incomplete combustion?
in complete combustion the amount of oxygen is higher/more than the amount of oxygen in incomplete combustion. Heat needs oxygen.
Is pressurized oxygen combustible?
Oxygen is neither combustible nor explosive, it is merely the chemical needed for combustion to take place. As such, the higher the concentration of oxygen, the higher the rate of combustion, provided that combustible material is present.
Why alcohol have higher boiling point than alkanes?
this is because of the presence of intermolecular hydrogen bonding in the polar molecules. energy is needed to over come the attractive forces resulting in higher boiling point values.
Which fuel is better for combustion--------higher calorific fuel or lower calorific fuel?
oxygen
How the melting point of alkenes can be increase by increasing molecular mass?
Melting points are determined by the strength of interaction between molecules in a solid. The greater the force of interaction, the higher the melting point. Molecular interactions are the result of the attraction between partially charged molecules or ions in a solid. Alkenes have little or no charge; they are nonpolar. In order for alkenes to stick to each other in a solid, they need to have partial charge induced randomly. This is known as London Dispersion Force. The probability of a partial charge occurring is increased when the size of a molecule's electron cloud increases. Bigger alkenes have bigger electron clouds, and thus have more powerful London dispersion force. More intermolecular force means higher melting points.
