1989 - George Bush succeeds Reagan as U.S. President, Soviets conclude their retreat from Afghanistan, Hungary dismantles 240 km of barbed wire fencing along the border with Austria - first crack in Iron Curtain.
1985
pH comes first as you make the water alkaline to promote the formation of flocs. You do this through adding lime (CaCO3) --> flocs and precipitates form --> sedimentation...
+1
pretty much what i did... i worked out q=mc/\T, multiplied that by two, (in kJ), worked from molar heat of combustion, found how many moles needed, from that found mass
This is where every 4Unit person feels redeemed for slaving over harder maths for 2 years. I know that personally, it felt like an easy 4U test, which was good for our class, but pretty much screwed everyone else over as it is supposed to be 3U!!