Alkanes
Are alkanes considered to be hydrocarbons?
Yes, as they only contain hydrogen and carbon.
What makes alkenes different from alkanes?
The presence of at least one double bond.
What state are the first 3 alkanes naturally found to be in?
Gas
Name the following:
CH3-CH2-CH2-CH2-CH3
Pentane
Are alkanes saturated?
Yes as there is only single bonds that exist between each present carbon.
How many carbons are found in Heptane?
7 Carbons
How many double bonds are present in Methene?
None as methene doesn't exist
What effect does an increasing carbon chain, if any, have on the boiling points of Alkanes and Alkenes.
The boiling points increase as they are more stable.
Name the following:
CH3-CH2-CH2-CH2-CH2-CH2-CH3
Heptane
What is the Valency of Carbon?
4, a carbon can form 4 seperate bonds.
How many hydrogen atoms are present in butane?
There are 10 hydrogen atoms present in butane.
Can multiple double bonds exist in an alkene?
Yes, but only in butene and beyond.
Are alkenes or alkanes more reactive? And Why?
CH3-CH2-CH2-CH2-CH=CH2
1-Hexene
Propane and Propene both contain 3 carbons, but which one is Unsaturated.
Propene is an unsaturated as there is a double bond present.
What is the molecular formula for an alkane?
What is the molecular formula for an alkene?
CnH2n
Which family of molecules make better fuels, Alkanes or Alkenes and why?
Alkanes are since the breaking of a single bond is easier and produces more energy when combusted.
CH3-CH2-CH=CH-CH=CH2
1,3 - Hexene
What effect does unsaturation have on a molecules boiling point?
It decreases the boiling point of a molecule.
Name the following compound C8H18
Octane
Name the following molecule and identify how many double bonds are present: C10H20
One double bond is present, Decene
What makes the double bond of an alkene reactive?
The higher electron density that exists between the two atoms
CH3-CH=CH-CH2-CH=CH-CH=CH2
1, 3, 6 - Octene
Which of the following compounds is unsaturated and why? C7H16 & C7H14
C7H14 is the unsaturated compound since there is a double bond indicated by the molecular formula.