Chemistry Fsc Part 1 Chapter 7 Online Test With Answers

Chemistry Fsc Part 1 Chapter 7 Online Test

Sr. # Questions Answers Choice
1 On an energy profile diagram the presence of a catalyst is represented by  A highe rpeak representing the activation energy A lower peak representing the activation energy A change in the energy level of the reactants or products A shift in the equilibrium position
2 How does the presence of a catalyst affect the rate of a chemical reaction  It always decreases the rate of the reaction It always increases the rate of the reaction In increase the rate of the forward and decreases the rate of the reverse reaction It increases the rate of both the forward and reverse reactions
3 The rate determinig step in a multistep reaction is The slowest step Always the first step Always the last step The fastest step
4 If we double the conentration of a reactant, the rate increases by four times, the reactionis. First Order Second Order Third Order Zero order
5 On a Boltzmann distribution curve, the activation energy is represented by The height of the peak The area under the entire curve A vertical line drawn at a specific kinetic energy value The difference between the peak and the X axis
6 On Boltzmann distribution curve, the area under the curve represents. Activation energy of the rreaction Total numebr f moleclues in the sample Average kinetic energy of the molecules Rate constant of the reaction
7 The order of a chemicla reaction, that is dependent of concentration is. Second order reaction First order reaction Zeroorder reaction Pseudo first order reaction
8 Considr two reactions with different activation energies at the same temperature, The reaction with the lower activation energy will have A smaller rate constatn A larger rate constant The same rate constant A rate constant that depends on the enthalpy change
9 Increasing the temperature of a chemical reaction increases the rate of a reaction because. Both the collision frequency and collision energies of reactant molecules increase Collision frequency of reactatn molecule increases Activation energy increase Activiation energy decrease
10 The rate of reaction . Increase as the reaction proceeds Decreases as the reaction proceeds Remains the same as the reaction proceeds May decrease or increse as the reaction proceeds
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