test questions

Question 1

write an equation inlcuding state symbols for the reaction with an enthlpy change equal to the enthalpy of formation for iron 3 oxide

Answer 1

Fe2+1.5o2>fe2o3

Question 2

give one reason why the bond enthalpy that you calculated is different from the mean bond enthalpy quoted in the data book

Answer 2

bond enthalpies are mean avergae based on a variety of compounds

Question 3

what will happen to the curve if theres a higher tempterature

Answer 3

shifts to the right lower peak and higher EA

Question 4

explain with reference to both curves on the graph how a small chnage in temp leads to a large change in ROR

Answer 4

more moleucles will have more or at least the activation energy thereoftre rate of reaction will increase as more molecules have frequent successful collisions with suffiecient energy is correct orientation

Question 5

state and explain the effect of higher pressure on the equillibrium yirld of methanol

Answer 5

-side with least amount of moles
-oppose change in the system
-produce more methanol -yield inc

Question 6

by considering both rate and yield state why the reaction is carried out at a temoertaure of 300 rather than hugher

Answer 6

-300 is a compromise
-if temp too high yield will decrease as the reaction is exothermic it will favour the endothermic side

Question 7

explain in terms of the beaviour of particles why a high operating pressure is used in industry

Answer 7

-more frequent and successful conditions
-as partciles are closer

Question 8

if yield of ocygen increases then kc

Answer 8

decreases