Q14 ,Q18 and Q20 2010 HSC (1 Viewer)
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14 is A
Esters are less polar than the corresponding alkanoic acid and alkanol. Hence the BP is <97Í
18 is c)
In order to shift the equilibrium left a base must be added. By adding a base, the hydroxide ions will react with the H+ ions. As a result the conc of H+ ions decreases and the equilibrium shifts left. Sinc sodium acetate is the only basic salt, therefore answer is C
20
use the principle that absorbtion is directly proportional to concentration i.e. A=kc
sub the values given for A and c to find k, then find concentration of the second copper solution. Find ratio of copper in copper carbonate to find the mass of CuCo3
you should get B
Esters are less polar than the corresponding alkanoic acid and alkanol. Hence the BP is <97Í
18 is c)
In order to shift the equilibrium left a base must be added. By adding a base, the hydroxide ions will react with the H+ ions. As a result the conc of H+ ions decreases and the equilibrium shifts left. Sinc sodium acetate is the only basic salt, therefore answer is C
20
use the principle that absorbtion is directly proportional to concentration i.e. A=kc
sub the values given for A and c to find k, then find concentration of the second copper solution. Find ratio of copper in copper carbonate to find the mass of CuCo3
you should get B
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