This page contains the AQA AS Chemistry C5 Kinetics Questions and their Kerboodle answers for revision and understanding Kinetics.This page also contains the link to the notes and video for the revision of this topic.
5.1 Collision Theory AQA AS Chemistry C5 Kinetics Kerboodle Answers: Page No. 96
1.Ans- The five factors that affect the speed of chemical reaction are-
a) Temperature
b) Concentration of a solution
c) Pressure of a gas reaction
d) Surface area ofsolid reactants
e) Catalysts
2.Ans-
a) Enthalpy of reactants
b) Enthalpy of products
c) Transition state
d) Activation Energy
3.Ans-
a) Exothermic reaction
b) It is an exothermic reaction as the enthalpy of reactants is greater than enthalpy of products.
5.2 The Maxwell-Boltzman Distribution AQA AS Chemistry C5 Kinetics Kerboodle Answers: Page No. 98
4.Ans
a) Fraction of particles with Energy E
b) Energy E
c) Number of particles with sufficient energy to react
d) On increasing the temperature,the peak of curve becomes lower.
e) There is no effect of temperature on Ea.
5.3 Catalyst AQA AS Chemistry C5 Kinetics Kerboodle Answers: Page No.100
5.Ans-
a) A-Energy,B-Extent of reaction,C-Transition state with catalyst,D-Transition state without catalyst,R-Energy of reactants,P-Energy of products.
b) D to R-Activation energy required without catalyst, C to R –Activation energy with catalyst
c) Exothermic Reaction
Practice Questions: Page No.104
1.Ans-
a) Activation energy is the minimum energy required to start a reaction that is the amount of energy required to break the bonds.
b) The reaction between hydrogen and chlorine is very slow at room temperature because the colliding molecules do not have enough energy to break the bonds and start the reactions
c) Increase in pressure increases the rate of reaction because it increases the concentration of the molecules in a given volume and hence the percentage of collisions.
d) A small increase in temperature can lead to a large increase in the rate of reaction because the number of particles with energy greater than activation energy increases and the speed of molecules also increases.
e) Catalyst is a substance that increases the rate of reaction without being altered chemically.
f) A solid catalyst for a gas-phase reaction is often in the form of a powder because this increases the surface area and hence the rate of reaction increases.
2.Ans-
a) Src- https://imgur.com/OkkDixe
b) Most of collision donot result in the reaction as they donot either have proper orientation or enough energy to start the reaction.
c) The collision frequency in a gas can be increased by increasing the pressure on the gas.
d) A small increase in temperature can lead to a large increase in the rate of reaction because the number of particles with energy greater than activation energy increases and the speed of molecule also increases.
e) The catalyst provide a different pathway with lower activation energy for the reaction to proceed.
3.Ans-
a) Src- https://imgur.com/riM52P8
b) The shape of the distribution remains unaltered in presence of a catalyst.
c) X
d) For a reaction to occur between two different gas molecules the molecules should collide with each other in proper orientation withenough energy to break the bonds and start the reaction.
e) A small increase in temperature can lead to a large increase in the rate of reaction because the number of particles with energy greater than activation energy increases and the speed of molecules also increases.
4.Ans-
b) This is because besides the number of molecules with energy greater than activation energy decreases,the energy of molecules also decreases hence they do not have enough energy to break the bonds and decompose.
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