Aqa A Level Chemistry – Equilibria Questions With Latest Answers

AQA A LEVEL CHEMISTRY – EQUILIBRIA
QUESTIONS WITH LATEST ANSWERS
What,are,the,two,characteristics,of,a,system,is,in,dynamic,equilibrium?,,,ANS,-
1.,both,forward,and,backward,reactions,proceed,at,equal,rate

2.,the,concentrations,of,the,reactants,and,products,remain,constant



What,is,Le,Chatlier's,principle,used,for?,,,ANS,-
It,is,a,tool,to,help,predict,the,effects,of,temp,,pressure,and,concentration,on,the,position,of,equilibrium



What,happens,to,the,position,of,equilibrium,if,temperature,is,increased?,,,ANS,-
The,equilibrium,will,shift,to,oppose,the,change,by,moving,in,the,endothermic,direction,(reduce,the,tempe
rature,by,absorbing,heat).



If,the,position,of,equilibrium,moves,in,the,exothermic,direction,,what,has,happened,to,the,temperature?,,
,ANS,-
The,temperature,has,decreased,(position,of,equilibrium,moves,to,oppose,the,change,,by,generating,heat,
energy)



What,will,happen,to,the,position,of,equilibrium,if,pressure,is,increased,(in,gaseous,system)?,,,ANS,-
Equilibrium,will,shift,in,the,direction,with,the,fewer,moles,of,gas,to,oppose,(reducing,the,pressure)



In,the,production,of,ammonia,from,nitrogen,and,hydrogen,,does,high,or,low,pressure,increase,the,yield?,,
,ANS,-
High,pressure,(N₂,+,3H₂,→2NH₃),will,increase,the,yield,of,ammonia.,The,equilibrium,will,move,the,the,righ
t,,with,fewer,gas,molecules,,to,oppose,the,change)



What,effect,does,a,catalyst,have,on,the,equilibrium?,,,ANS,-NO,EFFECT,on,the,position,of,an,equilibrium

Speeds,up,the,rate,of,the,forward,and,backward,reactions,equally



I₂,₊,2OH⁻,⇌,I⁻,+,IO⁻,+,H₂O