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Chapter 10


Uses of limestone blocks for buildings, lime for mortar, concrete
Who discovered concrete and when? Romans, 200BC
Uses of gypsum Plaster, stucco, sheetrock
When was plaster discovered? ~7000BC
What family of minerals is gypsum from? CaSO4
Anhydrite CaSO4
Bassanite CaSO4 . 1/2H2O aka plaster
gypsum CaSO4 . 2H2O aka alabaster
How does gypsum become plaster? Heated to 128C CaSO4.2H20(s)=CaSO4 .1/2H20(s)+3/2H20(l)
Plaster becomes anhydrite at... 168C CaSO4.1/2H20(s)=CaSO4+1/2H20(l)
Anhydrite slowly reconverts to plaster... CaSO4(s)+1/2H20(s)=CaSO4.1/2H20(s)
Plaster quickly reconverts to gypsum CaS04.1/2H20(s)=CaS04.2H20(s)
Family of minerals that limestone is from... CaCO3
calcite and aragonite CaCO3 (atoms arranged slightly differently)
dolomite CaCO3.MgCO3
Limestone comes from... sediment, seashells, insoluble in water
Limestone to quicklime CaCO3(s)=(burn)CaO(s)+CO2
Quicklime to slaked lime CaO(s)+H2O(l)=Ca(OH)2(s)
slaked lime and carbonic acid limestone
Carbonic acid H2CO3
process schematic go look, silly
Created by: Knaomi