2) Rates, ?? and Ea For the following modifications to a reaction identify which one or
combination of Rate, Ea or AHrxn is .A reaction is ran at higher temperature. Propane is burned
instead of methane. being affected. Twice as much reagent is used. .A catalyst is used. 3) Le
Chatelier's Principle For the following equilibrium reactions would you expect the reaction to
move more towards products or . A reaction of A B-C starts with plenty of A A reaction of D
EF+ G starts with a little ·A reaction of D + E ? F + G starts with a little reactants? and C but
no B. E, a lot of G and nothing else. E, a lot of G and then adds a little F.
Solution
2. i) A reaction is ran at higher temperature
Rate of reaction increase when temperature is increased because of increase in the rate constant
value.
?H = product enthalpy - reactant enthalpy so, temperature rise will not effect ?H value.
React depends on the strength of the bonds to be broken. So, it Will also be not effected.
ii) propane is burned instead of methane
In this case the reaction is different, so all the three variable will have different value than that fir
methane. So,
Rate, ?H and Ea will be affected.
iii) twice as much reagent is used
Rate of reaction depends on the substrate concentration but not on reagent concentration
So, rate will not be effected.
Again ?H and Ea will not be effected also.
iv) a catalyst is used

A catalyst increase the rate if reaction by providing an alternate path for the reaction having
lower activation energy Ea value. Si,
Rate of reaction will increase.
Ea of new path will be lesser(Ea will decrease)
?H will remain same.
3.i) since C will be formed when A and B will react with each other, initially no B is present so
reaction will be towards reactants to form B .
ii) In this case the reactants D and E will react to form F and G ,since initially only E and G are
present so reaction will not take place.
iii) In this case because no D is present initially, so reaction will move towards reactants