(5) (a) (i) to kill germs (ii) to cause coagulation (iii) to allow for other particles to coagulate (5b) (i) -as a dehydrating agent -as a oxidizing agent -as a drying agen (ii) this is because concentrated tetra oxosulphate (vi) is corrosive and can cause serious burns (iii) Zn(s)+H2SO4(l)=>ZnSO4(s)+H2(g) (5c) (i) reversible reaction (ii) decreasing the temperature (iii) platinium (civ) Kc=9([NH3]^2/[N2][H2]^3) (5d) (i) the first law of thermodynamics states that in a chemical system, the net workdone on the system is equal to the net heat liberated in the system. (ii) valency of an element is defined as an ion with a charge which can be positive or negative (iii) conc in moldm^-3= mole/volume volume=50/1000=0.05dm^3 0.5=mole/0.05 number of mole=0.5*0.05 =0.025mol molar mass=1+14+48=63gmol^-1 0.025=mass/63 mass of HNO3=0.025*63 =1.575g
Posted on: Tue, 12 Nov 2013 14:55:11 +0000
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