Alkanes Flashcards
What is the bond angle and shape around each C atom in an alkane?
109.5 Tetrahedral
Why is CO dangerous?
Toxic-binds to haemoglobin and stops oxygen intake
What is incomplete combustion?
A combustion reaction where the lack of oxygen results in products other than carbon dioxide and water
Methane and bromine under UV light makes….
Bromomethane + HBr
What is combustion?
The exothermic reaction of oxygen with fuel
What is an initiation step?
The generation of a free radical
Explain why boiling points of alkanes increase with chain length?
Larger surface contact between molecules ,stronger london forces ,therfore more energy needed to break.
What type of fission is Cl2 being broken by UV light?
Homolytic
What is a propogation?
Intermediate step in a free radical substitution reaction which casue the regeneration of the original free radical
Can sigma bonds roatate or not?
Yes
What is complete combustion?
A combustion reaction where there is enough oxygen to ensure the products are purely carbon dioxide and water
What is a sigma bond?
Direct overlap of 2 orbitals
What is the trend in boiling points of alkanews with chain length?
Increases BP with increasing chain length
Give 2 reasons why alkanes are unreactive
Low bond polarity,strong sigma bonds
