list the first 4 alkanes
methane, ethane, propane, butane
what happens to the boiling point as you go down the fractional distillation column?
increases
what do long hydrocarbons undergo to make them shorter?
cracking
how are alkenes different from alkanes
alkenes have a double bond
what is the equation for acceleration
f = ma
list three contact forces
buoyancy/normal force, tension, friction, applied, air resistance
how can we investigate magnetic fields
iron filings or charging rod
how do we calculate moments
moments = force x distance
what is efficiency
how much energy going into a system is used usefully or how little is wasted
what is the equation to work out efficiency
energy efficiency = useful output / total input
what is renewable energy
energy that comes from natural sources and can be replenished quicker
what is global warming
an increase in global temperatures caused by gases
what is eutrophication
minerals and nutrients have caused an algal bloom. plants cannot gain light so they die
