Yr9 Chemsitry-Hydrocarbons Flashcards
What is the chemical formula for methane?
CH4
Why are alkanes called hydrocarbons?
They only have hydrogen and carbon
If you look at the name how can you tell if something is a alkane?
It needs to end in -ane
Which of these are not alkanes?
Methane
Ethanol
Butane
Pentene
Ethane
Ethanoic acid
how did you find this out?
Ethanol
Pentene
Ethanoic acid
Don’t end in -ane
What is the formula of an alkane?
CnH2n + 2
How many hydrogens would an alkane with 8 carbons have?
18
What is the equation for complete combustion?
CH4 + 2O2 –> 2H2O + CO2
What is the equation for incomplete combustion?
2CH4 + 3O2 –> 4H2O + 2CO
What is viscosity?
How runny something is
What is flamibility?
How well it burns
Why isn’t C15H32 an ideal cooking feul?
C15H32 isn’t an ideal cooking as the long chains of carbon mke it have a smoky flame and doesn’t burn as well as other alkanes.
Which of these emmisions are poisinous?
Carbon Dioxide
Water
Nitrogen
Carbon Monoxide
Nitrogen monixide
Particles of Carbon
Carbon monixide
Pacticles of carbon
Carbon Dioxide
Nitrogen monoxide
What decomposes to make crude oil?
Marine Life
How long does crude oil take to form?
Millions of years
How do we extract crude oil?
Pump it up through pipes.
Why do we need a alternative to crude oil?
It is running out
How do we release energy from crude oil?
Burn it
What is used to seperate crude oil?
Fractional Distilation
What is the formula for alkenes?
CnH2n
Which of these are alkenes?
Metane
Ethane
Hexane
Pentene
Hexene
Ethanoic acid
Dodecene
How did you know?
Pentene
Hexene
Dodecene
They all end in -ene
What do alkenes react with to produce alkanes?
Hydrogen
What do alkenes react with to produce an alchohol?
Steam
What is the formula for alchohols?
CnH2n + 1OH
What are the properties of carboxylic acids?
High melting points
Very soluble in water
Weak acids
Characteristic smell