Das chemistry - was the mass of product 8.5g for last q on quantitative? The rate of reaction; speeds up the reaction and is same mass before and afterwards, reactant would not be- something along them lines? As time increases, rate also increases until reaction has stopped? What happens to limestone in furnace, thermal decompositon and then caO reacts with acidic sio2 to form ****, then tapped off? Fractional distilation; heated eneters as a vapour, hydrocarbons in vapour rise to different levels depending on boiling boints, large hc at bottom small at top, collected on trays as liquid at different parts of the fractioning column?