Why do longer chain alkanes have higher boiling points?
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. More energy is needed to separate them than short chain molecules which have only weak forces of attraction for each other.
Why do alkanes get thicker and less runny?
Why do alkanes get thicker and less runny as the length of the carbon chain increases? Theere are more forces of attraction when the number of hydrocarbons is small so as hydrocarbon size increases forces of attraction decrease as there is a higher surface area.
What factors make a good fuel?
A good fuel should have the following characteristics.
- It should be easily available.
- It should be cheap.
- It should have a high calorific value.
- It should have a low ignition point, which is not lower than room temperature (so that it does not catch fire at room temperature).
- It should not burn too fast or too slowly.
What are the 10 alkanes?
Table: Structural Formulas of the First Ten Continuous-chain Alkanes
| Name | Molecular Formula | Structural Formula |
|---|---|---|
| Pentane | C5H12 | CH3CH2CH2CH2CH3 |
| Hexane | C6H14 | CH3CH2CH2CH2CH2CH3 |
| Heptane | C7H16 | CH3CH2CH2CH2CH2CH2CH3 |
| Octane | C8H18 | CH3(CH2)6CH3 |
Does CnH2n 2 have general formula?
The general formula for the alkanes is CnH2n+2. A homologous series is a set of compounds with the same general formula, similar chemical properties and gradual changing physical properties. Alkanes, alkenes and cycloalkanes are each an example of a homologous series.
What does CnH2n-2 mean?
Alkanes have the molecular formula of “CnH2n+2” which means for every carbon molecule there are two hydrogens plus two more. For example when there is one Carbon there are four hydrogens, this molecule is known as “Methane”
Which structure can have the general formula CnH2n-2?
Alkanes have the general formula CnH2n+2 and can be subdivided into the following three groups: the linear straight-chain alkanes, branched alkanes, and cycloalkanes. Alkanes are also saturated hydrocarbons.
What does N stand for in CnH2n-2?
In this formula: n = number of carbon atoms in the same molecule of alkane. 2n + 2 = number of H-atoms in a molecule of alkane.