Flashcards in Alkanes Deck (17):
What are Hydrocarbons?
Compounds that contain only hydrogen and carbon atoms
What are Alkanes?
What is a Homologous series?
Family of organic compounds with same functional group and general formula, similar chemical reactions and similar trends in physical properties
Why do Alkanes form a homologous series?
They have the same general formula
Their carbon atoms are joined to each other by single covalent bonds (all alkanes are saturated)
What is the general formula for Alkanes?
What are the first 4 alkanes?
What happens as you move down the 4 alkanes?
The number of carbon atoms increases by 1
The number of hydrogen atoms increases by 2
How do you model Alkanes?
Using displayed formulae:
Each atom by is chemical symbol (eg. C or H)
Each covalent bond by a straight line
How many covalent bonds do Carbon atoms form?
4 covalent bonds
How many covalent bonds do Hydrogen atoms form?
1 covalent bond
What is the best way to draw the chemical formulae?
Draw the carbon atoms in a line first
Add the correct number of bonds
Add the hydrogen atoms
What is the main type of reaction involving Alkanes?
Combustion (reaction when substance burns in oxygen)
What happens to Alkanes if there is a plentiful supply of oxygen?
What happens in the Complete combustion of Alkanes?
Carbon atoms are oxidised to carbon dioxide
Hydrogen atoms are oxidised to water
What is a word equation to show the complete combustion of Propane?
Propane + Oxygen -> Carbon Dioxide + Water
What happens to Alkanes if there is a poor supply of oxygen?